Avalanche, Sierra, Silverado, C&K Series, 1999-2005

Camshaft, Bearings & Lifters 2

Print

Inspection




CAUTION
Wear safety glasses in order to avoid eye damage.

  1. Clean the engine camshaft in cleaning solvent.
  2.  
  3. Dry the engine camshaft with compressed air.
  4.  
  5. Inspect the camshaft retainer plate for damage. If the camshaft retainer plate is damaged, replace as necessary.
  6.  
  7. Inspect the camshaft bearings for correct fit into the engine block camshaft bearing bores. The camshaft bearings have an interference fit to the engine block camshaft bearing bores and must not be loose in the engine block camshaft bearing bores.
    NOTE
    If any camshaft bearing is excessively worn or scored, replace all the camshaft bearings. Inspect the camshaft bearings for excessive wear or scoring.



    Click image to see an enlarged view

    Fig. Camshaft-typical. See text for component identification

  8.  
  9. Inspect the engine camshaft for the following:

    Worn, scored, or damaged bearing journals (1)
     
    Worn engine camshaft lobes (2)
     
    Damaged bolt hole threads (3)
     
    Damaged camshaft sprocket locator pin (4)
     

  10.  
  11. Measure the engine camshaft journals with a micrometer. If the camshaft journals are more than 0.025 mm (0.0010 in) out-of-round, then replace the engine camshaft.

    Click image to see an enlarged view

    Fig. Using a micrometer to measure camshaft journal

  12.  
  13. Measure for a bent engine camshaft or excessive engine camshaft runout using tool J7872 or equivalent.

    Mount the engine camshaft in a suitable stand between centers.
     
    Use tool J7872 or equivalent in order to check the intermediate engine camshaft journals. If the runout exceeds 0.065 mm (0.0026 in), the engine camshaft is bent and must be replaced.

    Click image to see an enlarged view

    Fig. Using tool J7872 to measure runout and camshaft lobe lift

     

  14.  
  15. Measure the engine camshaft lobe lift using tool J7872 or equivalent.

    Place the engine camshaft on the V-blocks.
     
    Use tool J7872 or equivalent in order to measure the engine camshaft lobe lift.
     

  16.  
  17. Replace the engine camshaft if the engine camshaft lobe lift is not within specifications.
  18.  

Camshaft
End Play

After the camshaft has been installed, end-play should be checked. The camshaft sprocket should be installed on the cam. Use a dial gauge to check the end-play, by moving the camshaft forward and backward.

Click image to see an enlarged view

Fig. Checking camshaft end-play

After the camshaft has been installed, end-play should be checked. The camshaft sprocket should be installed on the cam. Use a dial gauge to check the end-play, by moving the camshaft forward and backward. Refer to the Camshaft Specifications chart.

Click image to see an enlarged view

Fig. Checking camshaft end-play

After the camshaft has been installed, end-play should be checked. The camshaft sprocket should be installed on the cam. Use a dial gauge to check the end-play, by moving the camshaft forward and backward. Refer to the Camshaft Specifications chart.

Click image to see an enlarged view

Fig. Checking camshaft end-play

End-Play Specifications


4.3L engine: 0.0010-0.0090 in (0.0254-0.2286 mm)
 
4.8L, 5.3L engines: 0.001-0.012 in. (0.025-0.305mm)
 
5.0 and 5.7L engines: 0.002-0.012 in, (0.05-0.30mm)
 
6.0L engines: 0.001-0.012 in. (0.025-0.305mm)
 
6.5L engines: 0.002-0.012 in, (0.51-0.305mm)
 
6.6L engines: 0.002-0.0045 in. (0.050-0.114mm) and service limit is 0.008 in. (0.20mm)
 
7.4L engines: not available at the time of publication
 
8.1L engines: not available at the time of publication
 

Lobe Height

Use a micrometer to check camshaft (lobe) height, making sure the anvil and the spindle of the micrometer are positioned directly on the heel and tip of the camshaft lobe as shown in the accompanying illustration.

Click image to see an enlarged view

Fig. Checking camshaft lobe height



Click image to see an enlarged view

Fig. Checking camshaft journal diameter

Use a micrometer to check camshaft (lobe) height, making sure the anvil and the spindle of the micrometer are positioned directly on the heel and tip of the camshaft lobe as shown in the accompanying illustration. Refer to the Camshaft Specifications chart.

Click image to see an enlarged view

Fig. Checking camshaft lobe height



Click image to see an enlarged view

Fig. Checking camshaft journal diameter

Use a micrometer to check camshaft (lobe) height, making sure the anvil and the spindle of the micrometer are positioned directly on the heel and tip of the camshaft lobe as shown in the accompanying illustration. Refer to the Camshaft Specifications chart.

Click image to see an enlarged view

Fig. Checking camshaft lobe height



Click image to see an enlarged view

Fig. Checking camshaft journal diameter

Lobe Height Specifications


4.3L engine: intake: 0.2704 in. (6.8678mm), exhaust: 0.2793 in. (7.0953mm)
 
4.8L, 5.3L engines: intake: 0.268 in. (6.82mm), exhaust 0.274 in. (6.96mm)
 
5.0 and 5.7L engines: intake: 0.274-0.278 in. (6.97-7.07mm), exhaust 0.283-0.287 in. (7.20-7.30mm)
 
6.0L engines: intake: 0.274 in. (6.96mm), exhaust: 0.281 in. (7.13mm)
 
6.5L engines: 0.2790-0.2830 in. (7.0830-7.1830mm)
 
6.6L engines: intake: 0.2863 in. (7.273mm), exhaust: 0.2326 in. (5.907mm)
 
7.4L engines: intake: 0.2801-0.2841 in. (7.115-7.216.mm), exhaust: 0.2823-0.2863 in. (7.170-7.272mm)
 
8.1L engines: intake: 0.2726-0.2766 in. (6.924-7.026mm), exhaust: 0.2745-0.2785in. (6.973-7.075mm)
 


NOTE
If only one lobe height specification is given then both intake and exhaust lobes have the same specification.

Runout

Camshaft run-out should be checked when the camshaft has been removed from the engine. An accurate dial indicator is needed for this procedure. If the run-out exceeds the limit replace the camshaft.

Click image to see an enlarged view

Fig. Checking camshaft run-out

Camshaft run-out should be checked when the camshaft has been removed from the engine. An accurate dial indicator is needed for this procedure. If the run-out exceeds the limit replace the camshaft. Refer to the Camshaft Specifications chart.

Click image to see an enlarged view

Fig. Checking camshaft run-out

Camshaft run-out should be checked when the camshaft has been removed from the engine. An accurate dial indicator is needed for this procedure. If the run-out exceeds the limit replace the camshaft. Refer to the Camshaft Specifications chart.

Click image to see an enlarged view

Fig. Checking camshaft run-out

Run-Out Specifications


4.3L engine: 0.0039 in. (0.100mm)
 
4.8L, 5.3L engines: 0.002 in. (0.05mm)
 
5.0 and 5.7L engines: 0.0026 in. (0.065mm)
 
5.3L engines: 0.002 in. (0.05mm)
 
6.0L engines: 0.002 in. (0.05mm)
 
6.5L engines: not available at the time of publication
 
6.6L engines: 0.002 in. (0.05mm)
 
7.4L engines: 0.002 in. (0.051mm)
 
8.1L engines:0.003 in. (0.076mm)
 

Removal & Installation



4.3L Engine
  1. Properly relieve the fuel system pressure.
  2.  
  3. Drain the engine cooling system.
  4.  
  5. Remove or disconnect the following:

    Negative battery cable
     
    Radiator
     
    Cooling fan
     
    Water pump
     
    Rocker arm covers from the engine
     
    Intake manifold assembly
     
    Rocker arms, pushrods and lifters
     
    Crankshaft pulley and hub
     
    Engine front cover
     

  6.  
  7. Align the timing marks on the crankshaft and camshaft sprockets.
    NOTE
    Install the sprocket bolts or longer bolts of the same thread into the end of the camshaft as a handle.



    Camshaft sprocket and timing chain
     
    Balance shaft drive gear, if equipped
     
    Camshaft thrust plate
     



    Camshaft
     

  8.  

To install:

  1. Lubricate the camshaft journals with clean engine oil or a suitable pre-lube.
  2.  
  3. Install or connect the following:

    Camshaft
     
    Camshaft thrust plate
     
    Balance shaft drive gear, if equipped
     
    Timing chain and camshaft sprocket
     
    Engine front cover
     
    Crankshaft pulley and hub
     
    Valve lifters
     
    Pushrods and rocker arms, properly adjust the valve clearance
     
    Intake manifold assembly
     
    Rocker arm covers to the engine
     
    Radiator to the vehicle
     
    Negative battery cable
     

  4.  
  5. Refill the engine cooling system.
  6.  

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Properly relieve the fuel system pressure.
  4.  
  5. Drain the engine cooling system.
  6.  
  7. Remove or disconnect the following:

    Negative battery cable
     
    Radiator
     
    Cooling fan
     
    Water pump
     
    Rocker arm covers from the engine
     
    Intake manifold assembly
     
    Rocker arms, pushrods and lifters
     
    Crankshaft pulley and hub
     
    Engine front cover
     

  8.  
  9. Align the timing marks on the crankshaft and camshaft sprockets.
    NOTE
    Install the sprocket bolts or longer bolts of the same thread into the end of the camshaft as a handle.



    Camshaft sprocket and timing chain
     
    Balance shaft drive gear, if equipped
     
    Camshaft thrust plate
     



    Camshaft
     

  10.  

To install:

  1. Lubricate the camshaft journals with clean engine oil or a suitable pre-lube.
  2.  
  3. Install or connect the following:

    Camshaft
     
    Camshaft thrust plate
     
    Balance shaft drive gear, if equipped
     
    Timing chain and camshaft sprocket
     
    Engine front cover
     
    Crankshaft pulley and hub
     
    Valve lifters
     
    Pushrods and rocker arms, properly adjust the valve clearance
     
    Intake manifold assembly
     
    Rocker arm covers to the engine
     
    Radiator to the vehicle
     
    Negative battery cable
     

  4.  
  5. Refill the engine cooling system.
  6.  

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Properly relieve the fuel system pressure.
  4.  
  5. Drain the engine cooling system.
  6.  
  7. Remove or disconnect the following:

    Negative battery cable
     
    Radiator
     
    Cooling fan
     
    Water pump
     
    Rocker arm covers from the engine
     
    Intake manifold assembly
     
    Rocker arms, pushrods and lifters
     
    Crankshaft pulley and hub
     
    Engine front cover
     

  8.  
  9. Align the timing marks on the crankshaft and camshaft sprockets.
    NOTE
    Install the sprocket bolts or longer bolts of the same thread into the end of the camshaft as a handle.



    Camshaft sprocket and timing chain
     
    Balance shaft drive gear, if equipped
     
    Camshaft thrust plate
     



    Camshaft
     

  10.  

To install:

  1. Lubricate the camshaft journals with clean engine oil or a suitable pre-lube.
  2.  
  3. Install or connect the following:

    Camshaft
     
    Camshaft thrust plate
     
    Balance shaft drive gear, if equipped
     
    Timing chain and camshaft sprocket
     
    Engine front cover
     
    Crankshaft pulley and hub
     
    Valve lifters
     
    Pushrods and rocker arms, properly adjust the valve clearance
     
    Intake manifold assembly
     
    Rocker arm covers to the engine
     
    Radiator to the vehicle
     
    Negative battery cable
     

  4.  
  5. Refill the engine cooling system.
  6.  

  1. Properly relieve the fuel system pressure.
  2.  
  3. Drain the engine cooling system.
  4.  
  5. Remove or disconnect the following:

    Negative battery cable
     
    Radiator
     
    Cooling fan
     
    Water pump
     
    Rocker arm covers from the engine
     
    Intake manifold assembly
     
    Rocker arms, pushrods and lifters
     
    Crankshaft pulley and hub
     
    Engine front cover
     

  6.  
  7. Align the timing marks on the crankshaft and camshaft sprockets.
    NOTE
    Install the sprocket bolts or longer bolts of the same thread into the end of the camshaft as a handle.



    Camshaft sprocket and timing chain
     
    Balance shaft drive gear, if equipped
     
    Camshaft thrust plate
     



    Camshaft
     

  8.  

To install:

  1. Lubricate the camshaft journals with clean engine oil or a suitable pre-lube.
  2.  
  3. Install or connect the following:

    Camshaft
     
    Camshaft thrust plate
     
    Balance shaft drive gear, if equipped
     
    Timing chain and camshaft sprocket
     
    Engine front cover
     
    Crankshaft pulley and hub
     
    Valve lifters
     
    Pushrods and rocker arms, properly adjust the valve clearance
     
    Intake manifold assembly
     
    Rocker arm covers to the engine
     
    Radiator to the vehicle
     
    Negative battery cable
     

  4.  
  5. Refill the engine cooling system.
  6.  

  1. Properly relieve the fuel system pressure.
  2.  
  3. Drain the engine cooling system.
  4.  
  5. Remove or disconnect the following:

    Negative battery cable
     
    Radiator
     
    Cooling fan
     
    Water pump
     
    Rocker arm covers from the engine
     
    Intake manifold assembly
     
    Rocker arms, pushrods and lifters
     
    Crankshaft pulley and hub
     
    Engine front cover
     

  6.  
  7. Align the timing marks on the crankshaft and camshaft sprockets.
    NOTE
    Install the sprocket bolts or longer bolts of the same thread into the end of the camshaft as a handle.



    Camshaft sprocket and timing chain
     
    Balance shaft drive gear, if equipped
     
    Camshaft thrust plate
     



    Camshaft
     

  8.  

To install:

  1. Lubricate the camshaft journals with clean engine oil or a suitable pre-lube.
  2.  
  3. Install or connect the following:

    Camshaft
     
    Camshaft thrust plate
     
    Balance shaft drive gear, if equipped
     
    Timing chain and camshaft sprocket
     
    Engine front cover
     
    Crankshaft pulley and hub
     
    Valve lifters
     
    Pushrods and rocker arms, properly adjust the valve clearance
     
    Intake manifold assembly
     
    Rocker arm covers to the engine
     
    Radiator to the vehicle
     
    Negative battery cable
     

  4.  
  5. Refill the engine cooling system.
  6.  

4.8L, 5.3L & 6.0L Engines
  1. Raise the hood to the servicing position and secure it. Move the hood hinge bolt to hold the hood in the servicing position.
  2.  
  3. Remove or disconnect the following:

    Battery negative cable
     
    Coolant
     
    Upper and lower radiator hoses from the engine
     
    Air cleaner duct from the engine
     
    A/C condenser mounting bolts, if equipped
     
    Radiator support and radiator
     
    Engine cooling fan
     
    Drive belt
     
    A/C drive belt, if equipped
     
    Engine sight shield
     
    Electrical wiring harness from the thermostat housing
     
    Water pump

    Click image to see an enlarged view

    Fig. Camshaft sensor removal-4.8L, 5.3L and 6.0L engines

     

  4.  
  5. Raise the vehicle.

    Starter motor
     
    Right side closeout cover and bolt
     
    Crankshaft balancer
     
    Engine oil pan
     
    Engine front cover
     
    Cylinder heads from the engine
     
    Valve lifters from the engine

    Click image to see an enlarged view

    Fig. Camshaft retainer removal-4.8L, 5.3L and 6.0L engines

     

  6.  
  7. Align the timing marks on the camshaft and crankshaft sprockets. Make sure that the number 1 piston is in the firing position.
    NOTE
    All camshaft journals are the same diameter, so care must be used in removing or installing the camshaft to avoid damage to the camshaft bearings.



    Camshaft sprocket
     
    Camshaft sensor bolt and sensor
     
    Camshaft retainer bolts and retainer
     

  8.  
  9. Install the three M8-1.25 x 100 mm bolts in the camshaft front bolt holes. Using the bolts as a handle, carefully rotate and pull the camshaft out of the engine block. Remove the bolts from the front of the camshaft.
  10.  
  11. Clean and inspect all sealing surfaces.
  12.  

To install:


NOTE
If camshaft replacement is required, the valve lifters must also be replaced.

  1. Lubricate the camshaft journals and the bearings with clean engine oil. Install three M8-1.25 x 100 mm (M8-1.25 x 4.0 in) bolts into the camshaft front bolt holes.
    NOTE
    All camshaft journals are the same diameter, so care must be used in removing or installing the camshaft to avoid damage to the camshaft bearings.

  2.  
  3. Using the bolts as a handle, carefully install the camshaft into the engine block. Remove the three bolts from the front of the camshaft.
    NOTE
    Install the retainer plate with the sealing gasket facing the engine block. The gasket surface on the engine block should be clean and free of dirt or debris.

  4.  
  5. Install or connect the following:

    Camshaft retainer and the bolts. Tighten the camshaft retainer bolts to 18 ft. lbs. (25 Nm).
     

  6.  
  7. Inspect the camshaft sensor O-ring seal. If the O-ring seal is not cut or damaged, it may be reused. Lubricate the O-ring seal with clean engine oil.

    Camshaft sensor and bolt. Tighten the bolt to 18 ft. lbs. (25 Nm).
     
    Camshaft sprocket and timing chain
     
    Valve lifters
     
    Cylinder heads
     
    Engine front cover to the engine
     
    Oil pan
     
    Right side closeout cover
     
    Starter motor
     
    Crankshaft balancer to the crankshaft
     
    Water pump
     
    Electrical wiring harness to the thermostat housing
     
    A/C drive belt, if equipped
     
    Drive belt
     
    Engine sight shield
     
    Radiator support and radiator
     
    A/C condenser mounting bolts
     
    Engine cooling fan
     
    Air cleaner duct
     
    Negative battery cable
     

  8.  

  1. Raise the hood to the servicing position and secure it. Move the hood hinge bolt to hold the hood in the servicing position.
  2.  
  3. Remove or disconnect the following:

    Battery negative cable
     
    Coolant
     
    Upper and lower radiator hoses from the engine
     
    Air cleaner duct from the engine
     
    A/C condenser mounting bolts, if equipped
     
    Radiator support and radiator
     
    Engine cooling fan
     
    Drive belt
     
    A/C drive belt, if equipped
     
    Engine sight shield

    Click image to see an enlarged view

    Fig. Camshaft sensor removal-4.8L, 5.3L and 6.0L engines

     
    Electrical wiring harness from the thermostat housing
     
    Water pump
     

  4.  
  5. Raise the vehicle.

    Starter motor
     
    Right side closeout cover and bolt
     
    Crankshaft balancer

    Click image to see an enlarged view

    Fig. Camshaft retainer removal-4.8L, 5.3L and 6.0L engines

     
    Engine oil pan
     
    Engine front cover
     
    Cylinder heads from the engine
     
    Valve lifters from the engine
     

  6.  
  7. Align the timing marks on the camshaft and crankshaft sprockets. Make sure that the number 1 piston is in the firing position.
    NOTE
    All camshaft journals are the same diameter, so care must be used in removing or installing the camshaft to avoid damage to the camshaft bearings.



    Camshaft sprocket
     
    Camshaft sensor bolt and sensor
     
    Camshaft retainer bolts and retainer
     

  8.  
  9. Install the three M8-1.25 x 100 mm bolts in the camshaft front bolt holes. Using the bolts as a handle, carefully rotate and pull the camshaft out of the engine block. Remove the bolts from the front of the camshaft.
  10.  
  11. Clean and inspect all sealing surfaces.
  12.  

To install:


NOTE
If camshaft replacement is required, the valve lifters must also be replaced.

  1. Lubricate the camshaft journals and the bearings with clean engine oil. Install three M8-1.25 x 100 mm (M8-1.25 x 4.0 in) bolts into the camshaft front bolt holes.
    NOTE
    All camshaft journals are the same diameter, so care must be used in removing or installing the camshaft to avoid damage to the camshaft bearings.

  2.  
  3. Using the bolts as a handle, carefully install the camshaft into the engine block. Remove the three bolts from the front of the camshaft.
    NOTE
    Install the retainer plate with the sealing gasket facing the engine block. The gasket surface on the engine block should be clean and free of dirt or debris.

  4.  
  5. Install or connect the following:

    Camshaft retainer and the bolts. Tighten the camshaft retainer bolts to 18 ft. lbs. (25 Nm).
     

  6.  
  7. Inspect the camshaft sensor O-ring seal. If the O-ring seal is not cut or damaged, it may be reused. Lubricate the O-ring seal with clean engine oil.

    Camshaft sensor and bolt. Tighten the bolt to 18 ft. lbs. (25 Nm).
     
    Camshaft sprocket and timing chain
     
    Valve lifters
     
    Cylinder heads
     
    Engine front cover to the engine
     
    Oil pan
     
    Right side closeout cover
     
    Starter motor
     
    Crankshaft balancer to the crankshaft
     
    Water pump
     
    Electrical wiring harness to the thermostat housing
     
    A/C drive belt, if equipped
     
    Drive belt
     
    Engine sight shield
     
    Radiator support and radiator
     
    A/C condenser mounting bolts
     
    Engine cooling fan
     
    Air cleaner duct
     
    Negative battery cable
     

  8.  


CAUTION
Before servicing any electrical component, the ignition key must be in the OFF or LOCK position and all electrical loads must be OFF, unless instructed otherwise in these procedures.

  1. Raise the hood to the servicing position and secure it. Move the hood hinge bolt to hold the hood in the servicing position.
  2.  
  3. Remove or disconnect the following:

    Battery negative cable
     
    Coolant
     
    Upper and lower radiator hoses from the engine
     
    Air cleaner duct from the engine
     
    A/C condenser mounting bolts, if equipped
     
    Radiator support and radiator form vehicle
     
    Engine cooling fan
     
    Drive belt
     
    A/C drive belt, if equipped
     
    Engine sight shield

    Click image to see an enlarged view

    Fig. Camshaft sensor removal-4.8L, 5.3L, 6.0L

     
    Electrical wiring harness from the thermostat housing
     
    Water pump
     

  4.  
  5. Raise the vehicle.
  6.  
  7. Remove or disconnect the following:

    Starter motor
     
    Right side closeout cover and bolt
     
    Crankshaft balancer

    Click image to see an enlarged view

    Fig. Camshaft retainer removal-4.8L, 5.3L, 6.0L

     
    Engine oil pan
     
    Engine front cover
     
    Cylinder heads from the engine
     
    Valve lifters from the engine
     

  8.  
  9. Align the timing marks on the camshaft and crankshaft sprockets. Make sure that the number 1 piston is in the firing position.
  10.  
  11. Remove or disconnect the following:
    NOTE
    All camshaft journals are the same diameter, so care must be used in removing or installing the camshaft to avoid damage to the camshaft bearings.



    Camshaft sprocket
     
    Camshaft sensor bolt and the sensor
     
    Camshaft retainer bolts and the retainer
     

  12.  
  13. Install the three M8-1.25 x 100 mm bolts in the camshaft front bolt holes. Using the bolts as a handle, carefully rotate and pull the camshaft out of the engine block. Remove the bolts from the front of the camshaft.
  14.  
  15. Clean and inspect all sealing surfaces.
  16.  

To install:


NOTE
If camshaft replacement is required, the valve lifters must also be replaced.

  1. Lubricate the camshaft journals and the bearings with clean engine oil. Install three M8-1.25 x 100 mm (M8-1.25 x 4.0 in) bolts into the camshaft front bolt holes.
    NOTE
    All camshaft journals are the same diameter, so care must be used in removing or installing the camshaft to avoid damage to the camshaft bearings.

  2.  
  3. Using the bolts as a handle, carefully install the camshaft into the engine block. Remove the three bolts from the front of the camshaft.
    NOTE
    Install the retainer plate with the sealing gasket facing the engine block. The gasket surface on the engine block should be clean and free of dirt or debris.

  4.  
  5. Install or connect the following:

    Camshaft retainer and the bolts. Tighten the camshaft retainer bolts to 25 Nm (18 ft. lbs.).
     

  6.  
  7. Inspect the camshaft sensor O-ring seal. If the O-ring seal is not cut or damaged, it may be reused. Lubricate the O-ring seal with clean engine oil.
  8.  
  9. Install or connect the following:

    Camshaft sensor and bolt. Tighten the camshaft sensor bolt to 25 Nm (18 ft. lbs.).
     
    Camshaft sprocket and timing chain
     
    Valve lifters
     
    Cylinder heads
     
    Engine front cover to the engine
     
    Oil pan
     
    Right side closeout cover
     
    Starter motor
     
    Crankshaft balancer to the crankshaft
     
    Water pump
     
    Electrical wiring harness to the thermostat housing
     
    A/C drive belt, if equipped
     
    Drive belt
     
    Engine sight shield
     
    Radiator support and radiator
     
    A/C condenser mounting bolts
     
    Engine cooling fan
     
    Air cleaner duct
     
    Battery negative cable to the battery
     

  10.  


CAUTION
Before servicing any electrical component, the ignition key must be in the OFF or LOCK position and all electrical loads must be OFF, unless instructed otherwise in these procedures.

  1. Raise the hood to the servicing position and secure it. Move the hood hinge bolt to hold the hood in the servicing position.
  2.  
  3. Remove or disconnect the following:

    Battery negative cable
     
    Coolant
     
    Upper and lower radiator hoses from the engine
     
    Air cleaner duct from the engine
     
    A/C condenser mounting bolts, if equipped
     
    Radiator support and radiator form vehicle
     
    Engine cooling fan
     
    Drive belt
     
    A/C drive belt, if equipped
     
    Engine sight shield

    Click image to see an enlarged view

    Fig. Camshaft sensor removal-4.8L, 5.3L, 6.0L

     
    Electrical wiring harness from the thermostat housing
     
    Water pump
     

  4.  
  5. Raise the vehicle.
  6.  
  7. Remove or disconnect the following:

    Starter motor
     
    Right side closeout cover and bolt
     
    Crankshaft balancer

    Click image to see an enlarged view

    Fig. Camshaft retainer removal-4.8L, 5.3L, 6.0L

     
    Engine oil pan
     
    Engine front cover
     
    Cylinder heads from the engine
     
    Valve lifters from the engine
     

  8.  
  9. Align the timing marks on the camshaft and crankshaft sprockets. Make sure that the number 1 piston is in the firing position.
  10.  
  11. Remove or disconnect the following:
    NOTE
    All camshaft journals are the same diameter, so care must be used in removing or installing the camshaft to avoid damage to the camshaft bearings.



    Camshaft sprocket
     
    Camshaft sensor bolt and the sensor
     
    Camshaft retainer bolts and the retainer
     

  12.  
  13. Install the three M8-1.25 x 100 mm bolts in the camshaft front bolt holes. Using the bolts as a handle, carefully rotate and pull the camshaft out of the engine block. Remove the bolts from the front of the camshaft.
  14.  
  15. Clean and inspect all sealing surfaces.
  16.  

To install:


NOTE
If camshaft replacement is required, the valve lifters must also be replaced.

  1. Lubricate the camshaft journals and the bearings with clean engine oil. Install three M8-1.25 x 100 mm (M8-1.25 x 4.0 in) bolts into the camshaft front bolt holes.
    NOTE
    All camshaft journals are the same diameter, so care must be used in removing or installing the camshaft to avoid damage to the camshaft bearings.

  2.  
  3. Using the bolts as a handle, carefully install the camshaft into the engine block. Remove the three bolts from the front of the camshaft.
    NOTE
    Install the retainer plate with the sealing gasket facing the engine block. The gasket surface on the engine block should be clean and free of dirt or debris.

  4.  
  5. Install or connect the following:

    Camshaft retainer and the bolts. Tighten the camshaft retainer bolts to 25 Nm (18 ft. lbs.).
     

  6.  
  7. Inspect the camshaft sensor O-ring seal. If the O-ring seal is not cut or damaged, it may be reused. Lubricate the O-ring seal with clean engine oil.
  8.  
  9. Install or connect the following:

    Camshaft sensor and bolt. Tighten the camshaft sensor bolt to 25 Nm (18 ft. lbs.).
     
    Camshaft sprocket and timing chain
     
    Valve lifters
     
    Cylinder heads
     
    Engine front cover to the engine
     
    Oil pan
     
    Right side closeout cover
     
    Starter motor
     
    Crankshaft balancer to the crankshaft
     
    Water pump
     
    Electrical wiring harness to the thermostat housing
     
    A/C drive belt, if equipped
     
    Drive belt
     
    Engine sight shield
     
    Radiator support and radiator
     
    A/C condenser mounting bolts
     
    Engine cooling fan
     
    Air cleaner duct
     
    Battery negative cable to the battery
     

  10.  

  1. Raise the hood to the servicing position and secure it. Move the hood hinge bolt to hold the hood in the servicing position.
  2.  
  3. Remove or disconnect the following:

    Battery negative cable
     
    Coolant
     
    Upper and lower radiator hoses from the engine
     
    Air cleaner duct from the engine
     
    A/C condenser mounting bolts, if equipped
     
    Radiator support and radiator
     
    Engine cooling fan
     
    Drive belt
     
    A/C drive belt, if equipped
     
    Engine sight shield
     
    Electrical wiring harness from the thermostat housing
     
    Water pump

    Click image to see an enlarged view

    Fig. Camshaft sensor removal-4.8L, 5.3L and 6.0L engines

     

  4.  
  5. Raise the vehicle.

    Starter motor
     
    Right side closeout cover and bolt
     
    Crankshaft balancer
     
    Engine oil pan
     
    Engine front cover
     
    Cylinder heads from the engine
     
    Valve lifters from the engine

    Click image to see an enlarged view

    Fig. Camshaft retainer removal-4.8L, 5.3L and 6.0L engines

     

  6.  
  7. Align the timing marks on the camshaft and crankshaft sprockets. Make sure that the number 1 piston is in the firing position.
    NOTE
    All camshaft journals are the same diameter, so care must be used in removing or installing the camshaft to avoid damage to the camshaft bearings.



    Camshaft sprocket
     
    Camshaft sensor bolt and sensor
     
    Camshaft retainer bolts and retainer
     

  8.  
  9. Install the three M8-1.25 x 100 mm bolts in the camshaft front bolt holes. Using the bolts as a handle, carefully rotate and pull the camshaft out of the engine block. Remove the bolts from the front of the camshaft.
  10.  
  11. Clean and inspect all sealing surfaces.
  12.  

To install:


NOTE
If camshaft replacement is required, the valve lifters must also be replaced.

  1. Lubricate the camshaft journals and the bearings with clean engine oil. Install three M8-1.25 x 100 mm (M8-1.25 x 4.0 in) bolts into the camshaft front bolt holes.
    NOTE
    All camshaft journals are the same diameter, so care must be used in removing or installing the camshaft to avoid damage to the camshaft bearings.

  2.  
  3. Using the bolts as a handle, carefully install the camshaft into the engine block. Remove the three bolts from the front of the camshaft.
    NOTE
    Install the retainer plate with the sealing gasket facing the engine block. The gasket surface on the engine block should be clean and free of dirt or debris.

  4.  
  5. Install or connect the following:

    Camshaft retainer and the bolts. Tighten the camshaft retainer bolts to 18 ft. lbs. (25 Nm).
     

  6.  
  7. Inspect the camshaft sensor O-ring seal. If the O-ring seal is not cut or damaged, it may be reused. Lubricate the O-ring seal with clean engine oil.

    Camshaft sensor and bolt. Tighten the bolt to 18 ft. lbs. (25 Nm).
     
    Camshaft sprocket and timing chain
     
    Valve lifters
     
    Cylinder heads
     
    Engine front cover to the engine
     
    Oil pan
     
    Right side closeout cover
     
    Starter motor
     
    Crankshaft balancer to the crankshaft
     
    Water pump
     
    Electrical wiring harness to the thermostat housing
     
    A/C drive belt, if equipped
     
    Drive belt
     
    Engine sight shield
     
    Radiator support and radiator
     
    A/C condenser mounting bolts
     
    Engine cooling fan
     
    Air cleaner duct
     
    Negative battery cable
     

  8.  

4.8L, 5.3L, 6.0L & 6.2L Engines
  1. Raise the hood to the servicing position and secure it. Move the hood hinge bolt to hold the hood in the servicing position.
  2.  
  3. Remove or disconnect the following:

    Battery negative cable
     
    Coolant
     
    Upper and lower radiator hoses from the engine
     
    Air cleaner duct from the engine
     
    A/C condenser mounting bolts, if equipped
     
    Radiator support and radiator
     
    Engine cooling fan
     
    Drive belt
     
    A/C drive belt, if equipped
     
    Engine sight shield
     
    Electrical wiring harness from the thermostat housing
     
    Water pump

    Click image to see an enlarged view

    Fig. Camshaft sensor removal-4.8L, 5.3L, 6.0L and 6.2L engines

     

  4.  
  5. Raise the vehicle.

    Starter motor
     
    Right side closeout cover and bolt
     
    Crankshaft balancer
     
    Engine oil pan
     
    Engine front cover
     
    Cylinder heads from the engine
     
    Valve lifters from the engine

    Click image to see an enlarged view

    Fig. Camshaft retainer removal-4.8L, 5.3L, 6.0L and 6.2L engines

     

  6.  
  7. Align the timing marks on the camshaft and crankshaft sprockets. Make sure that the number 1 piston is in the firing position.
    NOTE
    All camshaft journals are the same diameter, so care must be used in removing or installing the camshaft to avoid damage to the camshaft bearings.



    Camshaft sprocket
     
    Camshaft sensor bolt and sensor
     
    Camshaft retainer bolts and retainer
     

  8.  
  9. Install the three M8-1.25 x 100 mm bolts in the camshaft front bolt holes. Using the bolts as a handle, carefully rotate and pull the camshaft out of the engine block. Remove the bolts from the front of the camshaft.
  10.  
  11. Clean and inspect all sealing surfaces.
  12.  

To install:


NOTE
If camshaft replacement is required, the valve lifters must also be replaced.

  1. Lubricate the camshaft journals and the bearings with clean engine oil. Install three M8-1.25 x 100 mm (M8-1.25 x 4.0 in) bolts into the camshaft front bolt holes.
    NOTE
    All camshaft journals are the same diameter, so care must be used in removing or installing the camshaft to avoid damage to the camshaft bearings.

  2.  
  3. Using the bolts as a handle, carefully install the camshaft into the engine block. Remove the three bolts from the front of the camshaft.
    NOTE
    Install the retainer plate with the sealing gasket facing the engine block. The gasket surface on the engine block should be clean and free of dirt or debris.

  4.  
  5. Install or connect the following:

    Camshaft retainer and the bolts. Tighten the camshaft retainer bolts to 18 ft. lbs. (25 Nm).
     

  6.  
  7. Inspect the camshaft sensor O-ring seal. If the O-ring seal is not cut or damaged, it may be reused. Lubricate the O-ring seal with clean engine oil.

    Camshaft sensor and bolt. Tighten the bolt to 18 ft. lbs. (25 Nm).
     
    Camshaft sprocket and timing chain
     
    Valve lifters
     
    Cylinder heads
     
    Engine front cover to the engine
     
    Oil pan
     
    Right side closeout cover
     
    Starter motor
     
    Crankshaft balancer to the crankshaft
     
    Water pump
     
    Electrical wiring harness to the thermostat housing
     
    A/C drive belt, if equipped
     
    Drive belt
     
    Engine sight shield
     
    Radiator support and radiator
     
    A/C condenser mounting bolts
     
    Engine cooling fan
     
    Air cleaner duct
     
    Negative battery cable
     

  8.  

5.0L & 5.7L Engines
  1. Drain the cooling system.
  2.  
  3. Properly relieve the fuel system pressure.
  4.  
  5. Remove or disconnect the following:

    Engine cover (if equipped)
     
    Air cleaner
     
    Air conditioning condenser and swing the condenser forward from its mounting, if equipped.
     
    Fan, the shroud and the radiator
     
    Valve covers
     
    Water pump assembly
     

  6.  
  7. Align the timing marks and remove the torsional damper.

    Timing chain cover
     
    Electrical and vacuum connections at the intake manifold
     
    Distributor assembly, mark the distributor rotor-to-housing location
     
    Intake manifold, pushrods and hydraulic lifters
     
    Camshaft sprocket bolts
     
    Camshaft sprocket and timing chain
     
    Crankshaft sprocket, as required
     
    Front engine mount through-bolts and raise the engine to gain sufficient clearance for camshaft removal, as required
     

  8.  
  9. Install 2 or 3 5 / 16 -18 bolts 4-5 in. (102-127mm) long into the camshaft threaded holes.
    NOTE
    Inspect the shaft for signs of excessive wear or damage.



    Camshaft
     

  10.  

To install:


NOTE
Liberally coat camshaft and bearing with heavy engine oil or engine assembly lubricant.

  1. Install or connect the following:

    Camshaft, align the timing marks on the camshaft and crankshaft gears
     
    Engine mount through-bolts
     
    Camshaft sprocket and chain. Torque the bolts to 18 ft. lbs. (25 Nm).
     
    Hydraulic lifters and pushrods
     
    Distributor assembly
     
    Timing chain cover
     
    Torsional damper
     
    Water pump
     
    Valve covers
     
    Fan, the shroud and radiator
     
    Air conditioning condenser, if equipped
     
    Air cleaner
     
    Engine cover (if equipped)
     
    Negative battery cable
     

  2.  
  3. Refill the cooling system.
  4.  

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Drain the cooling system.
  4.  
  5. Properly relieve the fuel system pressure.
  6.  
  7. Remove or disconnect the following:

    Engine cover, on van models
     
    Air cleaner
     
    Grille and center support, on van models
     
    Air conditioning condenser and swing the condenser forward from its mounting, if equipped.
     
    Fan, the shroud and the radiator
     
    Valve covers
     
    Water pump assembly
     

  8.  
  9. Align the timing marks and remove the torsional damper.

    Timing chain cover
     
    Electrical and vacuum connections at the intake manifold
     
    Distributor assembly, mark the distributor rotor-to-housing location
     
    Intake manifold, pushrods and hydraulic lifters
     
    Camshaft sprocket bolts
     
    Camshaft sprocket and timing chain
     
    Crankshaft sprocket, as required
     
    Front engine mount through-bolts and raise the engine to gain sufficient clearance for camshaft removal, as required
     

  10.  
  11. Install 2 or 3 5 / 16 -18 bolts 4-5 in. (102-127mm) long into the camshaft threaded holes.
    NOTE
    Inspect the shaft for signs of excessive wear or damage.



    Camshaft
     



    Click image to see an enlarged view

    Fig. Install 2 or 3 long bolts into the camshaft to use as a handle for easy removal or installation-7.4L engine shown, other engines similar

  12.  

To install:


NOTE
Liberally coat camshaft and bearing with heavy engine oil or engine assembly lubricant.

  1. Install or connect the following:

    Camshaft, align the timing marks on the camshaft and crankshaft gears
     
    Engine mount through-bolts
     
    Camshaft sprocket and chain. Torque the bolts to 18 ft. lbs. (25 Nm).
     
    Hydraulic lifters and pushrods
     
    Distributor assembly
     
    Timing chain cover
     
    Torsional damper
     
    Water pump
     
    Valve covers
     
    Fan, the shroud and radiator
     
    Air conditioning condenser, if equipped
     
    Grille and center support, on van models
     
    Air cleaner
     
    Engine cover, on van models
     
    Negative battery cable
     

  2.  
  3. Refill the cooling system.
  4.  

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Drain the cooling system.
  4.  
  5. Properly relieve the fuel system pressure.
  6.  
  7. Remove or disconnect the following:

    Engine cover, on van models
     
    Air cleaner
     
    Grille and center support, on van models
     
    Air conditioning condenser and swing the condenser forward from its mounting, if equipped.
     
    Fan, the shroud and the radiator
     
    Valve covers
     
    Water pump assembly
     

  8.  
  9. Align the timing marks and remove the torsional damper.

    Timing chain cover
     
    Electrical and vacuum connections at the intake manifold
     
    Distributor assembly, mark the distributor rotor-to-housing location
     
    Intake manifold, pushrods and hydraulic lifters
     
    Camshaft sprocket bolts
     
    Camshaft sprocket and timing chain
     
    Crankshaft sprocket, as required
     
    Front engine mount through-bolts and raise the engine to gain sufficient clearance for camshaft removal, as required
     

  10.  
  11. Install 2 or 3 5 / 16 -18 bolts 4-5 in. (102-127mm) long into the camshaft threaded holes.
    NOTE
    Inspect the shaft for signs of excessive wear or damage.



    Camshaft
     



    Click image to see an enlarged view

    Fig. Install 2 or 3 long bolts into the camshaft to use as a handle for easy removal or installation-7.4L engine shown, other engines similar

  12.  

To install:


NOTE
Liberally coat camshaft and bearing with heavy engine oil or engine assembly lubricant.

  1. Install or connect the following:

    Camshaft, align the timing marks on the camshaft and crankshaft gears
     
    Engine mount through-bolts
     
    Camshaft sprocket and chain. Torque the bolts to 18 ft. lbs. (25 Nm).
     
    Hydraulic lifters and pushrods
     
    Distributor assembly
     
    Timing chain cover
     
    Torsional damper
     
    Water pump
     
    Valve covers
     
    Fan, the shroud and radiator
     
    Air conditioning condenser, if equipped
     
    Grille and center support, on van models
     
    Air cleaner
     
    Engine cover, on van models
     
    Negative battery cable
     

  2.  
  3. Refill the cooling system.
  4.  

 
label.common.footer.alt.autozoneLogo