Infiniti Car 1998-05

Rocker Arms & Shafts

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Removal & Installation



2.0L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Relieve the fuel system pressure.
  4.  
  5. Drain the cooling system.
  6.  
  7. Remove or disconnect the following:

    Negative battery cable
     
    Right front wheel
     
    Engine side cover
     
    Radiator
     
    Air duct to the intake manifold
     
    Drive belts, water pump pulley, alternator and power steering pump
     
    Vacuum hoses, fuel hoses and wiring harness connectors
     
    Spark plugs, the Air Intake Valve (AIV) and resonator
     
    Rocker cover and oil separator. Loosen rocker cover bolts, using 2 to 3 steps, in the opposite sequence of tightening.
     
    Intake manifold supports
     
    Oil filter bracket and power steering oil pump bracket
     

  8.  
  9. Set No. 1 piston at Top Dead Center (TDC) on the compression stroke by rotating the crankshaft.

    Chain tensioner
     
    Distributor. Do not turn the rotor with the distributor removed.
     
    Timing chain guide, camshaft sprockets, camshafts, brackets, oil tubes and baffle plate. The camshaft bracket bolts must be loosened in sequence to prevent damage to the camshafts or the head.
     
    Rocker arm assembly
     

  10.  

To install:

  1. Check the hydraulic lash adjusters to ensure they did not bleed down during disassembly by trying to compress them. If the lash adjuster can be compressed 0.04 in. (1mm), air has entered and it must be bleed.
  2.  


NOTE
Air cannot be bled from the lash adjusters by running the engine.

  1. Clean the camshaft end bracket and coat with liquid gasket. Install the camshafts, camshaft brackets, oil tubes and baffle plate. Ensure the left camshaft key is at 12 o'clock and the right camshaft key is at 10 o'clock.
  2.  


    Click image to see an enlarged view

    Fig. Exploded view of the rocker arms and related components-2.0L engine



NOTE
The procedure for tightening camshaft bracket bolts must be followed exactly to prevent camshaft damage.

  1. Line up the mating marks on the timing chain and camshaft sprockets and install the sprockets. Torque the sprocket bolts to 101-116 ft. lbs. (137-157 Nm).
  2.  
  3. Install or connect the following:

    Timing chain guide, distributor (ensure that rotor head is at 5 o'clock position) and chain tensioner
     
    Intake manifold supports. Clean the rocker cover and mating surfaces and apply a continuous bead of liquid gasket to the mating surface.
     
    Rocker cover and oil separator. Tighten the rocker cover bolts in sequence.
     
    Oil filter bracket and the power steering pump bracket
     
    Spark plugs, AIV valve and the resonator
     
    Fuel lines, vacuum hoses and wiring connectors
     
    Water pump pulley, alternator and power steering pump
     
    Drive belts
     
    Intake manifold air duct, engine side cover and right wheel
     
    Radiator
     
    Negative battery cable
     

  4.  
  5. Fill and bleed the cooling system.
  6.  
  7. Start the vehicle, check for leaks and repair if necessary.
  8.  


    Click image to see an enlarged view

    Fig. Submerge the lash adjuster in engine oil, lightly unseat the check ball with a thin rod and push on the plunger to release the air


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

    Negative battery cable
     
    Right front wheel
     
    Engine side cover
     
    Radiator
     
    Air duct to the intake manifold
     
    Drive belts, water pump pulley, alternator and power steering pump
     
    Vacuum hoses, fuel hoses and wiring harness connectors
     
    Spark plugs, the AIV valve and resonator
     
    Rocker cover and oil separator. Loosen rocker cover bolts, using 2 to 3 steps, in the opposite sequence of tightening
     
    Intake manifold supports
     
    Oil filter bracket and power steering oil pump bracket
     

  8.  
  9. Set No. 1 piston at Top Dead Center (TDC) on the compression stroke by rotating the crankshaft.

    Chain tensioner
     
    Distributor. Do not turn the rotor with the distributor removed
     
    Timing chain guide, camshaft sprockets, camshafts, brackets, oil tubes and baffle plate. The camshaft bracket bolts must be loosened in sequence to prevent damage to the camshafts or the head.
     
    Rocker arm assembly
     

  10.  

To install:

  1. Check the hydraulic lash adjusters to ensure they did not bleed down during disassembly by trying to compress them. If the lash adjuster can be compressed 0.04 in. (1mm), air has entered and it must be bleed.
    NOTE
    Air cannot be bled from the lash adjusters by running the engine.

  2.  
  3. Clean the camshaft end bracket and coat with liquid gasket. Install the camshafts, camshaft brackets, oil tubes and baffle plate. Ensure the left camshaft key is at 12 o'clock and the right camshaft key is at 10 o'clock.
    NOTE
    The procedure for tightening camshaft bracket bolts must be followed exactly to prevent camshaft damage.



    Click image to see an enlarged view

    Fig. Exploded view of the rocker arms and related components-2.0L engine

  4.  
  5. Line up the mating marks on the timing chain and camshaft sprockets and install the sprockets. Torque the sprocket bolts to 101-116 ft. lbs. (137-157 Nm).
  6.  
  7. Install or connect the following:

    Timing chain guide, distributor (ensure that rotor head is at 5 o'clock position) and chain tensioner
     
    Intake manifold supports. Clean the rocker cover and mating surfaces and apply a continuous bead of liquid gasket to the mating surface
     
    Rocker cover and oil separator. Tighten the rocker cover bolts in sequence
     
    Oil filter bracket and the power steering pump bracket
     
    Spark plugs, AIV valve and the resonator
     
    Fuel lines, vacuum hoses and wiring connectors
     
    Water pump pulley, alternator and power steering pump
     
    Drive belts
     
    Intake manifold air duct, engine side cover and right wheel
     
    Radiator
     
    Negative battery cable
     

  8.  
  9. Fill and bleed the cooling system.
  10.  
  11. Start the vehicle, check for leaks and repair if necessary.

    Click image to see an enlarged view

    Fig. Submerge the lash adjuster in engine oil, lightly unseat the check ball with a thin rod and push on the plunger to release the air

  12.  

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Relieve the fuel system pressure.
  4.  
  5. Drain the cooling system.
  6.  
  7. Remove or disconnect the following:

    Negative battery cable
     
    Right front wheel
     
    Engine side cover
     
    Radiator
     
    Air duct to the intake manifold
     
    Drive belts, water pump pulley, alternator and power steering pump
     
    Vacuum hoses, fuel hoses and wiring harness connectors
     
    Spark plugs, the AIV valve and resonator
     
    Rocker cover and oil separator. Loosen rocker cover bolts, using 2 to 3 steps, in the opposite sequence of tightening
     
    Intake manifold supports
     
    Oil filter bracket and power steering oil pump bracket
     

  8.  
  9. Set No. 1 piston at Top Dead Center (TDC) on the compression stroke by rotating the crankshaft.

    Chain tensioner
     
    Distributor. Do not turn the rotor with the distributor removed
     
    Timing chain guide, camshaft sprockets, camshafts, brackets, oil tubes and baffle plate. The camshaft bracket bolts must be loosened in sequence to prevent damage to the camshafts or the head.
     
    Rocker arm assembly
     

  10.  

To install:

  1. Check the hydraulic lash adjusters to ensure they did not bleed down during disassembly by trying to compress them. If the lash adjuster can be compressed 0.04 in. (1mm), air has entered and it must be bleed.
    NOTE
    Air cannot be bled from the lash adjusters by running the engine.

  2.  
  3. Clean the camshaft end bracket and coat with liquid gasket. Install the camshafts, camshaft brackets, oil tubes and baffle plate. Ensure the left camshaft key is at 12 o'clock and the right camshaft key is at 10 o'clock.
    NOTE
    The procedure for tightening camshaft bracket bolts must be followed exactly to prevent camshaft damage.



    Click image to see an enlarged view

    Fig. Exploded view of the rocker arms and related components-1998-2001 2.0L engine

  4.  
  5. Line up the mating marks on the timing chain and camshaft sprockets and install the sprockets. Torque the sprocket bolts to 101-116 ft. lbs. (137-157 Nm).
  6.  
  7. Install or connect the following:

    Timing chain guide, distributor (ensure that rotor head is at 5 o'clock position) and chain tensioner
     
    Intake manifold supports. Clean the rocker cover and mating surfaces and apply a continuous bead of liquid gasket to the mating surface
     
    Rocker cover and oil separator. Tighten the rocker cover bolts in sequence
     
    Oil filter bracket and the power steering pump bracket
     
    Spark plugs, AIV valve and the resonator
     
    Fuel lines, vacuum hoses and wiring connectors
     
    Water pump pulley, alternator and power steering pump
     
    Drive belts
     
    Intake manifold air duct, engine side cover and right wheel
     
    Radiator
     
    Negative battery cable
     

  8.  
  9. Fill and bleed the cooling system.
  10.  
  11. Start the vehicle, check for leaks and repair if necessary.

    Click image to see an enlarged view

    Fig. Submerge the lash adjuster in engine oil, lightly unseat the check ball with a thin rod and push on the plunger to release the air-1998-2001

  12.  

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Relieve the fuel system pressure.
  4.  
  5. Drain the cooling system.
  6.  
  7. Remove or disconnect the following:

    Negative battery cable
     
    Right front wheel
     
    Engine side cover
     
    Radiator
     
    Air duct to the intake manifold
     
    Drive belts, water pump pulley, alternator and power steering pump
     
    Vacuum hoses, fuel hoses and wiring harness connectors
     
    Spark plugs, the Air Intake Valve (AIV) and resonator
     
    Rocker cover and oil separator. Loosen rocker cover bolts, using 2 to 3 steps, in the opposite sequence of tightening.
     
    Intake manifold supports
     
    Oil filter bracket and power steering oil pump bracket
     

  8.  
  9. Set No. 1 piston at Top Dead Center (TDC) on the compression stroke by rotating the crankshaft.

    Chain tensioner
     
    Distributor. Do not turn the rotor with the distributor removed.
     
    Timing chain guide, camshaft sprockets, camshafts, brackets, oil tubes and baffle plate. The camshaft bracket bolts must be loosened in sequence to prevent damage to the camshafts or the head.
     
    Rocker arm assembly
     

  10.  

To install:

  1. Check the hydraulic lash adjusters to ensure they did not bleed down during disassembly by trying to compress them. If the lash adjuster can be compressed 0.04 in. (1mm), air has entered and it must be bled.
    NOTE
    Air cannot be bled from the lash adjusters by running the engine.

  2.  
  3. Clean the camshaft end bracket and coat with liquid gasket. Install the camshafts, camshaft brackets, oil tubes and baffle plate. Ensure the left camshaft key is at 12 o'clock and the right camshaft key is at 10 o'clock.
    NOTE
    The procedure for tightening camshaft bracket bolts must be followed exactly to prevent camshaft damage.



    Click image to see an enlarged view

    Fig. Exploded view of the rocker arms and related components-2002 2.0L engine

  4.  
  5. Line up the mating marks on the timing chain and camshaft sprockets and install the sprockets. Torque the sprocket bolts to 101-116 ft. lbs. (137-157 Nm).
  6.  
  7. Install or connect the following:

    Timing chain guide, distributor (ensure that rotor head is at 5 o'clock position) and chain tensioner
     
    Intake manifold supports. Clean the rocker cover and mating surfaces and apply a continuous bead of liquid gasket to the mating surface.
     
    Rocker cover and oil separator. Tighten the rocker cover bolts in sequence.
     
    Oil filter bracket and the power steering pump bracket
     
    Spark plugs, AIV valve and the resonator
     
    Fuel lines, vacuum hoses and wiring connectors
     
    Water pump pulley, alternator and power steering pump
     
    Drive belts
     
    Intake manifold air duct, engine side cover and right wheel
     
    Radiator
     
    Negative battery cable
     

  8.  
  9. Fill and bleed the cooling system.
  10.  
  11. Start the vehicle, check for leaks and repair if necessary.

    Click image to see an enlarged view

    Fig. Submerge the lash adjuster in engine oil, lightly unseat the check ball with a thin rod and push on the plunger to release the air-2002 2.0L engine

  12.  

3.0L, 3.5L And 4.5L Engines

NOTE
The valves in the 3.0L, 3.5L and 4.5L engines are actuated directly by the camshaft. No rocker arms are used in these engines.

4.1L Engines
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Engine and transmission assembly from the vehicle
     
    Suspension member and engine mounts from the engine
     
    Air compressor bracket
     
    Cooling fan with coupling and the engine gusset
     

  4.  
  5. Separate the engine from the transmission and mount the engine on a suitable workstand.

    Oil pan
     
    Crank angle sensor and the Valve Timing Control (VTC) solenoid
     
    Chain tensioners and the upper front covers
     
    Front timing chain cover
     

  6.  


NOTE
The timing chain will not be disengaged or dislocated from the crankshaft sprocket unless the front cover is removed. The cast portion of the front cover is located on the lower side of the crankshaft sprocket so the timing chain is not disengaged from the sprocket.



VTC assembly and the camshaft sprocket
 
Oil pump chain and the timing chains
 


NOTE
Do not attempt to disassemble the VTC assembly since they are difficult to reassemble accurately in the field. If it should be disassembled, the VTC assembly must be replaced with a new one.



Camshaft brackets and the camshafts. Mark the parts so they can be reinstalled in their original positions.
 
Rocker arms. Be sure to identify each rocker arm so they can be reinstalled in their original positions.
 

To install:

  1. Be sure all mating surfaces are clean before installation.
  2.  
  3. Install or connect the following:

    Rocker arms, camshafts and camshaft brackets on the right bank. Properly lubricate the rocker arms and camshafts prior to installation.
     
    VTC assembly and the exhaust cam sprocket on the right bank
     

  4.  
  5. Be sure the camshafts are still correctly positioned and the piston in the No. 1 cylinder is still at Top Dead Center (TDC).

    Timing chain on the right bank, aligning the mating marks on the chain with those on the crankshaft and camshaft sprockets
     
    Chain tensioner on the right bank
     



    Click image to see an enlarged view

    Fig. Press down on the lash adjuster to check for bleed-down-4.1L engines

  6.  
  7. Turn the crankshaft approximately 120° clockwise from the point where the No. 1 piston is at TDC on the compression stroke. At this point, the valves on the left bank still remain closed.
  8.  
  9. Correctly position the camshafts and rocker arms for the left cylinder head. Properly lubricate the rocker arms and camshafts prior to installation. Install the VTC assembly and the exhaust cam sprocket.
  10.  
  11. Install the timing chain on the left bank, aligning the mating marks on the chain with those on the crankshaft and camshaft sprockets.
  12.  
  13. Install or connect the following:

    Oil pump chain and sprockets
     
    Oil pump chain guides. Place a 0.04 in. (1.0mm) feeler gauge between the upper chain guide and chain before assembling the chain guides. The force applied to the chain is equivalent to the upper chain guide weight.
     

  14.  
  15. Apply suitable sealer and install the front covers.

    Chain tensioner for the left bank
     

  16.  
  17. Apply suitable sealer to the rubber plugs and install them on the cylinder head.

    Crank angle sensor, VTC solenoid, rocker cover and crank pulley
     
    Transmission on the engine and install the engine assembly in the vehicle
     

  18.  

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Engine and transmission assembly from the vehicle
     
    Suspension member and engine mounts from the engine
     
    Air compressor bracket
     
    Cooling fan with coupling and the engine gusset
     

  4.  
  5. Separate the engine from the transmission and mount the engine on a suitable workstand.
    NOTE
    The timing chain will not be disengaged or dislocated from the crankshaft sprocket unless the front cover is removed. The cast portion of the front cover is located on the lower side of the crankshaft sprocket so the timing chain is not disengaged from the sprocket.


    NOTE
    Do not attempt to disassemble the VTC assembly since they are difficult to reassemble accurately in the field. If it should be disassembled, the VTC assembly must be replaced with a new one.



    Oil pan
     
    Crank angle sensor and the Valve Timing Control (VTC) solenoid
     
    Chain tensioners and the upper front covers
     
    Front timing chain cover
     



    VTC assembly and the camshaft sprocket
     
    Oil pump chain and the timing chains
     



    Camshaft brackets and the camshafts. Mark the parts so they can be reinstalled in their original positions
     
    Rocker arms. Be sure to identify each rocker arm so it can be reinstalled in it's original position.
     

  6.  

To install:

  1. Be sure all mating surfaces are clean before installation.
  2.  
  3. Install or connect the following:

    Rocker arms, camshafts and camshaft brackets on the right bank. Properly lubricate the rocker arms and camshafts prior to installation
     
    VTC assembly and the exhaust cam sprocket on the right bank
     

  4.  
  5. Be sure the camshafts are still correctly positioned and the piston in the No. 1 cylinder is still at Top Dead Center (TDC).

    Click image to see an enlarged view

    Fig. Press down on the lash adjuster to check for bleed-down-4.1L engines



    Timing chain on the right bank, aligning the mating marks on the chain with those on the crankshaft and camshaft sprockets
     
    Chain tensioner on the right bank
     

  6.  
  7. Turn the crankshaft approximately 120° clockwise from the point where the No. 1 piston is at TDC on the compression stroke. At this point, the valves on the left bank still remain closed.
  8.  
  9. Correctly position the camshafts and rocker arms for the left cylinder head. Properly lubricate the rocker arms and camshafts prior to installation. Install the VTC assembly and the exhaust cam sprocket.
  10.  
  11. Install the timing chain on the left bank, aligning the mating marks on the chain with those on the crankshaft and camshaft sprockets.
  12.  
  13. Install or connect the following:

    Oil pump chain and sprockets
     
    Oil pump chain guides. Place a 0.04 in. (1.0mm) feeler gauge between the upper chain guide and chain before assembling the chain guides. The force applied to the chain is equivalent to the upper chain guide weight
     

  14.  
  15. Apply suitable sealer and install the front covers.

    Chain tensioner for the left bank
     

  16.  
  17. Apply suitable sealer to the rubber plugs and install them on the cylinder head.

    Crank angle sensor, VTC solenoid, rocker cover and crank pulley
     
    Transmission on the engine and install the engine assembly in the vehicle
     

  18.  

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Engine and transmission assembly from the vehicle
     
    Suspension member and engine mounts from the engine
     
    Air compressor bracket
     
    Cooling fan with coupling and the engine gusset
     

  4.  
  5. Separate the engine from the transmission and mount the engine on a suitable workstand.
    NOTE
    The timing chain will not be disengaged or dislocated from the crankshaft sprocket unless the front cover is removed. The cast portion of the front cover is located on the lower side of the crankshaft sprocket so the timing chain is not disengaged from the sprocket.


    NOTE
    Do not attempt to disassemble the VTC assembly since they are difficult to reassemble accurately in the field. If it should be disassembled, the VTC assembly must be replaced with a new one.



    Oil pan
     
    Crank angle sensor and the Valve Timing Control (VTC) solenoid
     
    Chain tensioners and the upper front covers
     
    Front timing chain cover
     



    VTC assembly and the camshaft sprocket
     
    Oil pump chain and the timing chains
     



    Camshaft brackets and the camshafts. Mark the parts so they can be reinstalled in their original positions
     
    Rocker arms. Be sure to identify each rocker arm so it can be reinstalled in its original position.
     

  6.  

To install:

  1. Be sure all mating surfaces are clean before installation.
  2.  
  3. Install or connect the following:

    Rocker arms, camshafts and camshaft brackets on the right bank. Properly lubricate the rocker arms and camshafts prior to installation
     
    VTC assembly and the exhaust cam sprocket on the right bank
     

  4.  
  5. Be sure the camshafts are still correctly positioned and the piston in the No. 1 cylinder is still at Top Dead Center (TDC).

    Click image to see an enlarged view

    Fig. Press down on the lash adjuster to check for bleed-down-4.1L engine



    Timing chain on the right bank, aligning the mating marks on the chain with those on the crankshaft and camshaft sprockets
     
    Chain tensioner on the right bank
     

  6.  
  7. Turn the crankshaft approximately 120° clockwise from the point where the No. 1 piston is at TDC on the compression stroke. At this point, the valves on the left bank still remain closed.
  8.  
  9. Correctly position the camshafts and rocker arms for the left cylinder head. Properly lubricate the rocker arms and camshafts prior to installation. Install the VTC assembly and the exhaust cam sprocket.
  10.  
  11. Install the timing chain on the left bank, aligning the mating marks on the chain with those on the crankshaft and camshaft sprockets.
  12.  
  13. Install or connect the following:

    Oil pump chain and sprockets
     
    Oil pump chain guides. Place a 0.04 in. (1.0mm) feeler gauge between the upper chain guide and chain before assembling the chain guides. The force applied to the chain is equivalent to the upper chain guide weight
     

  14.  
  15. Apply suitable sealer and install the front covers.

    Chain tensioner for the left bank
     

  16.  
  17. Apply suitable sealer to the rubber plugs and install them on the cylinder head.

    Crank angle sensor, VTC solenoid, rocker cover and crank pulley
     
    Transmission on the engine and install the engine assembly in the vehicle
     

  18.  

 
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