Nissan Car Altima & Sentra 1999-06

Camshaft, Bearings & Lifters 1

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Inspection



Check camshaft for scratches, seizure and wear.

Removal & Installation



1.6L And 1.8L Engines
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Drain the cooling system.
  4.  
  5. Relieve the fuel system pressure.

    Click image to see an enlarged view

    Fig. Be sure to install the camshaft bearing caps in their original positions-1.6L and 1.8L engines engine

  6.  
  7. Remove or disconnect the following:
    NOTE
    Before the camshafts are removed from the cylinder head, note the positioning of the pins at the end of the camshafts for reassembly purposes.



    Negative battery cable
     
    All engine drive belts
     
    Exhaust pipe from the exhaust manifold
     
    Power steering pulley and pump with the mounting bracket
     
    Cylinder head cover
     
    Distributor assembly
     
    Timing chain tensioners and camshaft sprocket
     



    Camshaft bearing caps in sequence
     
    Camshafts from the cylinder head
     
    Idler sprocket bolt. These parts should be reassembled in their original position.
     
    Shims from the tops of the lifters. Be sure to note the position of each shim.
     
    Valve lifters from the bores in the cylinder head. Note the positioning of the lifters for reassembly.
     

  8.  
  9. Measure the diameter of the lifters. The diameter should be 1.1795-1.1801 in. (29.960-29.975mm).
  10.  
  11. Measure the diameter of the lifter bores. The diameter should be 1.1811-1.1819 in. (30.000-30.021mm).
  12.  
  13. Clearance between the lifter and bore should be 0.0010-0.0024 in. (0.025-0.061mm).
  14.  

To install:

  1. Install or connect the following:
    NOTE
    The exhaust and intake camshafts are marked with identification stamps. (E for exhaust and I for intake).



    Lifters and shims to the cylinder head in the proper locations as noted during removal
     



    Camshafts to the cylinder head and position the intake camshaft knock pin at the 9 o'clock position and the exhaust camshaft at the 12 o'clock position

    Click image to see an enlarged view

    Fig. Positioning and identification of the camshafts-1.6L and 1.8L engines



    Click image to see an enlarged view

    Fig. If removed, apply liquid gasket to the distributor bracket as shown-1.6L and 1.8L engine



    Click image to see an enlarged view

    Fig. Camshaft bolt torque sequence-1.6L and 1.8L engines

     

  2.  
  3. Install the camshaft bearing caps and tighten the mounting bolts as follows:
    1. Bolts 11 through 15, then bolts 1 through 10: 18 inch lbs. (2 Nm).
    2.  
    3. Bolts 1 through 15: 53 inch lbs. (6 Nm).
    4.  
    5. Bolts 1 through 14: 87-105 inch lbs. (10-12 Nm).
    6.  
    7. Bolt 15: 56-73 inch lbs. (7-8 Nm).
      NOTE
      If any part of the valvetrain has been has been replaced, the valve adjustment must be checked. DO NOT adjust the valves or rotate the camshafts at this point. Internal engine damage will result.

    8.  

  4.  
  5. Install or connect the following:

    Camshaft sprockets with timing chains
     
    Distributor assembly
     

  6.  
  7. Check and adjust the valve clearance.

    Cylinder head cover
     
    Power steering pulley pump
     
    Exhaust pipe from the exhaust manifold
     
    All engine drive belts
     
    Negative battery cable
     

  8.  
  9. Fill the cooling system.
  10.  
  11. Start the vehicle, check for leaks and repair if necessary.
  12.  

1.6L Engine
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Drain the cooling system.
  4.  
  5. Relieve the fuel system pressure.

    Click image to see an enlarged view

    Fig. Be sure to install the camshaft bearing caps in their original positions-1.6L engine

  6.  
  7. Remove or disconnect the following:
    NOTE
    Before the camshafts are removed from the cylinder head, note the positioning of the pins at the end of the camshafts for reassembly purposes.



    Negative battery cable
     
    All engine drive belts
     
    Exhaust pipe from the exhaust manifold
     
    Power steering pulley and pump with the mounting bracket
     
    Cylinder head cover
     
    Distributor assembly
     
    Timing chain tensioners and camshaft sprocket
     



    Camshaft bearing caps in sequence
     
    Camshafts from the cylinder head
     
    Idler sprocket bolt. These parts should be reassembled in their original position.
     
    Shims from the tops of the lifters. Be sure to note the position of each shim.
     
    Valve lifters from the bores in the cylinder head. Note the positioning of the lifters for reassembly.
     

  8.  
  9. Measure the diameter of the lifters. The diameter should be 1.1795-1.1801 in. (29.960-29.975mm).
  10.  
  11. Measure the diameter of the lifter bores. The diameter should be 1.1811-1.1819 in. (30.000-30.021mm).
  12.  
  13. Clearance between the lifter and bore should be 0.0010-0.0024 in. (0.025-0.061mm).
  14.  

To install:

  1. Install or connect the following:
    NOTE
    The exhaust and intake camshafts are marked with identification stamps. (E for exhaust and I for intake).



    Lifters and shims to the cylinder head in the proper locations as noted during removal
     



    Camshafts to the cylinder head and position the intake camshaft knock pin at the 9 o'clock position and the exhaust camshaft at the 12 o'clock position

    Click image to see an enlarged view

    Fig. Positioning and identification of the camshafts-1.6L engine



    Click image to see an enlarged view

    Fig. If removed, apply liquid gasket to the distributor bracket as shown-1.6L engine



    Click image to see an enlarged view

    Fig. Camshaft bolt torque sequence-1.6L engine

     

  2.  
  3. Install the camshaft bearing caps and tighten the mounting bolts as follows:
    1. Bolts 11 through 15, then bolts 1 through 10: 18 inch lbs. (2 Nm).
    2.  
    3. Bolts 1 through 15: 53 inch lbs. (6 Nm).
    4.  
    5. Bolts 1 through 14: 87-105 inch lbs. (10-12 Nm).
    6.  
    7. Bolt 15: 56-73 inch lbs. (7-8 Nm).
      NOTE
      If any part of the valvetrain has been has been replaced, the valve adjustment must be checked. DO NOT adjust the valves or rotate the camshafts at this point. Internal engine damage will result.

    8.  

  4.  
  5. Install or connect the following:

    Camshaft sprockets with timing chains
     
    Distributor assembly
     

  6.  
  7. Check and adjust the valve clearance.
  8.  
  9. Install or connect the following:

    Cylinder head cover
     
    Power steering pulley pump
     
    Exhaust pipe from the exhaust manifold
     
    All engine drive belts
     
    Negative battery cable
     

  10.  
  11. Fill the cooling system.
  12.  
  13. Start the vehicle, check for leaks and repair if necessary.
  14.  

1.8L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Drain the cooling system.
  4.  
  5. Relieve the fuel system pressure.
  6.  
  7. Remove or disconnect the following:

    Negative battery cable
     
    All engine drive belts
     
    Exhaust pipe from the exhaust manifold
     
    Power steering pulley and pump with the mounting bracket
     
    Cylinder head cover
     
    Distributor assembly
     
    Timing chain tensioners and camshaft sprocket
     

  8.  


    Click image to see an enlarged view

    Fig. Be sure to install the camshaft bearing caps in their original positions-1.8L engine



NOTE
Before the camshafts are removed from the cylinder head, note the positioning of the pins at the end of the camshafts for reassembly purposes.



Camshaft bearing caps in sequence
 
Camshafts from the cylinder head
 
Idler sprocket bolt. These parts should be reassembled in their original position.
 
Shims from the tops of the lifters. Be sure to note the position of each shim.
 
Valve lifters from the bores in the cylinder head. Note the positioning of the lifters for reassembly.
 

  1. Measure the diameter of the lifters. The diameter should be 1.1795-1.1801 in. (29.960-29.975mm).
  2.  
  3. Measure the diameter of the lifter bores. The diameter should be 1.1811-1.1819 in. (30.000-30.021mm).
  4.  
  5. Clearance between the lifter and bore should be 0.0010-0.0024 in. (0.025-0.061mm).
  6.  

To install:

  1. Install or connect the following:

    Lifters and shims to the cylinder head in the proper locations as noted during removal
     

  2.  


NOTE
The exhaust and intake camshafts are marked with identification stamps. (E for exhaust and I for intake).



Camshafts to the cylinder head and position the intake camshaft knock pin at the 9 o'clock position and the exhaust camshaft at the 12 o'clock position
 



Click image to see an enlarged view

Fig. Positioning and identification of the camshafts-1.8L engine



Click image to see an enlarged view

Fig. If removed, apply liquid gasket to the distributor bracket as shown-1.8L engine



Click image to see an enlarged view

Fig. Camshaft bolt torque sequence-1.8L engine

  1. Install the camshaft bearing caps and tighten the mounting bolts as follows:
    1. Bolts 11 through 15, then bolts 1 through 10: 18 inch lbs. (2 Nm).
    2.  
    3. Bolts 1 through 15: 53 inch lbs. (6 Nm).
    4.  
    5. Bolts 1 through 14: 87-105 inch lbs. (10-12 Nm).
    6.  
    7. Bolt 15: 56-73 inch lbs. (7-8 Nm).
    8.  

  2.  


NOTE
If any part of the valvetrain has been has been replaced, the valve adjustment must be checked. DO NOT adjust the valves or rotate the camshafts at this point. Internal engine damage will result.

  1. Install or connect the following:

    Camshaft sprockets with timing chains
     
    Distributor assembly
     

  2.  
  3. Check and adjust the valve clearance.

    Cylinder head cover
     
    Power steering pulley pump
     
    Exhaust pipe from the exhaust manifold
     
    All engine drive belts
     
    Negative battery cable
     

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

2.0L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Properly relieve the fuel system pressure.
  4.  
  5. Remove or disconnect the following:

    Negative battery cable
     
    Rocker cover and oil separator
     

  6.  
  7. Rotate the crankshaft until the No.1 piston is at Top Dead Center (TDC) on the compression stroke. Then, rotate the crankshaft until the mating marks on the camshaft sprockets line up with the mating marks on the timing chain.

    Timing chain tensioner
     
    Distributor
     
    Timing chain guide
     
    Camshaft sprockets. Use a wrench to hold the camshaft while loosening the sprocket bolt.
     
    Camshaft bracket bolts in the opposite order of the tightening sequence
     
    Camshaft
     

  8.  

To install:



Click image to see an enlarged view

Fig. To prevent damage to the camshafts, torque the bearing caps in the numbered.



Click image to see an enlarged view

Fig. and lettered sequence shown. Refer to the text for the proper torque-2.0L engines

  1. Clean the left-hand camshaft end bracket and coat the mating surface 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.  
  3. The procedure for tightening camshaft bolts must be followed exactly to prevent camshaft damage. Torque the bolts as follows:
    1. Right bolts 9 and 10 (in that order): 18 inch lbs. (2 Nm).
    2.  
    3. Right bolts 1-8 (in that order): 18 inch lbs. (2 Nm).
    4.  
    5. Left bolts 11 and 12 (in that order): 18 inch lbs. (2 Nm).
    6.  
    7. Left bolts 1-10 (in that order): 18 inch lbs. (2 Nm).
    8.  
    9. All bolts in sequence: 52 inch lbs. (6 Nm).
    10.  
    11. All bolts in sequence: 7-9 ft. lbs. (9-12 Nm) for type A, B and C bolts and 13-19 ft. lbs. (18-25 Nm) for type D bolts.
    12.  

  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
     
    Timing chain tensioner
     
    Rocker cover and oil separator
     
    Negative battery cable
     

  8.  
  9. Start the vehicle, check for leaks and repair if necessary.
  10.  

  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. Remove or disconnect the following:

    Negative battery cable
     
    Rocker cover and oil separator
     

  6.  
  7. Rotate the crankshaft until the No.1 piston is at Top Dead Center (TDC) on the compression stroke. Then, rotate the crankshaft until the mating marks on the camshaft sprockets line up with the mating marks on the timing chain.
  8.  
  9. Remove or disconnect the following:

    Timing chain tensioner
     
    Distributor
     
    Timing chain guide
     
    Camshaft sprockets. Use a wrench to hold the camshaft while loosening the sprocket bolt.
     
    Camshaft bracket bolts in the opposite order of the tightening sequence
     
    Camshaft
     

  10.  

To install:

  1. Clean the left-hand camshaft end bracket and coat the mating surface 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.  
  3. The procedure for tightening camshaft bolts must be followed exactly to prevent camshaft damage. Torque the bolts as follows:
    1. Right bolts 9 and 10 (in that order): 18 inch lbs. (2 Nm).
    2.  
    3. Right bolts 1-8 (in that order): 18 inch lbs. (2 Nm).
    4.  
    5. Left bolts 11 and 12 (in that order): 18 inch lbs. (2 Nm).
    6.  
    7. Left bolts 1-10 (in that order): 18 inch lbs. (2 Nm).
    8.  
    9. All bolts in sequence: 52 inch lbs. (6 Nm).
    10.  
    11. All bolts in sequence: 7-9 ft. lbs. (9-12 Nm) for type A, B and C bolts and 13-19 ft. lbs. (18-25 Nm) for type D bolts.
    12.  

  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).

    Timing chain guide
     
    Distributor
     
    Timing chain tensioner
     
    Rocker cover and oil separator
     
    Negative battery cable
     

  6.  
  7. Start the vehicle, check for leaks and repair if necessary.

    Click image to see an enlarged view

    Fig. To prevent damage to the camshafts, torque the bearing caps in the numbered--.



    Click image to see an enlarged view

    Fig. --- and lettered sequence shown. Refer to the text for the proper torque-2.0L engines

  8.  

2.0L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Properly relieve the fuel system pressure.
  4.  
  5. Remove or disconnect the following:

    Negative battery cable
     
    Valve cover and oil separator
     

  6.  
  7. Rotate the crankshaft until the No.1 piston is at Top Dead Center (TDC) on the compression stroke. Then, rotate the crankshaft until the mating marks on the camshaft sprockets line up with the mating marks on the timing chain.

    Timing chain tensioner
     
    Distributor
     
    Timing chain guide
     
    Camshaft sprockets. Use a wrench to hold the camshaft while loosening the sprocket bolt.
     
    Camshaft bracket bolts in the opposite order of the tightening sequence
     
    Camshaft
     

  8.  

To install:

Click image to see an enlarged view

Fig. To prevent damage to the camshafts, torque the bearing caps in the numbered--.



Click image to see an enlarged view

Fig. --- and lettered sequence shown. Refer to the text for the proper torque-2.0L engines

  1. Clean the left-hand camshaft end bracket and coat the mating surface 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.  
  3. The procedure for tightening camshaft bolts must be followed exactly to prevent camshaft damage. Torque the bolts as follows:
    1. Right bolts 9 and 10 (in that order): 18 inch lbs. (2 Nm).
    2.  
    3. Right bolts 1-8 (in that order): 18 inch lbs. (2 Nm).
    4.  
    5. Left bolts 11 and 12 (in that order): 18 inch lbs. (2 Nm).
    6.  
    7. Left bolts 1-10 (in that order): 18 inch lbs. (2 Nm).
    8.  
    9. All bolts in sequence: 52 inch lbs. (6 Nm).
    10.  
    11. All bolts in sequence: 7-9 ft. lbs. (9-12 Nm) for type A, B and C bolts and 13-19 ft. lbs. (18-25 Nm) for type D bolts.
    12.  

  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
     
    Timing chain tensioner
     
    Valve cover and oil separator
     
    Negative battery cable
     

  8.  
  9. Start the vehicle, check for leaks and repair if necessary.
  10.  

2.4L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Relieve the fuel system pressure.
  4.  
  5. Drain coolant from the engine and radiator.
  6.  
  7. Remove or disconnect the following:

    Negative battery cable
     
    Air intake ducts and the air cleaner assembly
     
    Vacuum hoses, fuel hoses, wires, harness and connectors that are necessary for removal of the rocker cover
     
    Alternator and mounting bracket
     
    Upper radiator hose and cooling fan
     

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

    Spark plug wires from the spark plugs
     
    Distributor assembly. Matchmark and note the positioning of the distributor rotor and housing to the engine block before removing the distributor.
     
    Rocker cover by loosening the bolts in the reverse order of installation
     

  10.  
  11. Wire the chain to the sprocket so the chain does not fall off during sprocket removal. Hold the flats of the camshaft with a wrench just behind the first camshaft bearing cap. Loosen the bolts and remove the sprockets.

    Camshaft sprockets
     

  12.  


NOTE
The stoppers on camshaft covers prevent the upper timing chain from disengaging from the idle sprocket. Also, after removal of the camshaft sprockets, note the positioning of the pins at the end of the camshafts for reinstallation purposes.



Camshaft bearing caps in reverse order of installation
 
Camshafts. The camshaft brackets must be loosened in the correct sequence to prevent damage to the camshaft.
 


NOTE
All the valvetrain components must be reassembled in their original positions.



Valve lifter adjusting shims from the tops of the of the lifters. Be sure to note the location and positioning of each shim.
 
Valve lifters from the bores in the cylinder heads. Be sure to note the location and positioning of each lifter.
 

  1. Check the diameter of the valve lifter and the valve lifter bore and compare to the following specifications.
  2.  
  3. The valve lifter diameter should be 1.3370-1.3376 in. (33.960-33.975mm).
  4.  
  5. The lifter guide bore diameter should be 1.3386-1.3394 in. (33.960-33.975mm).
  6.  
  7. The valve lifter to lifter guide bore clearance should be 0.0010-0.0024 in. (0.025-0.061mm).
  8.  

To install:


NOTE
When installing the valve components, apply a coat of clean engine oil to the component.

  1. Install or connect the following:

    Lifters into the lifter bores from which they were removed
     
    Valve shims to the lifters from which they came
     

  2.  
  3. Install the camshafts in the same position as noted during removal and camshaft bearing caps; torque cap bolts in the proper sequence as follows:
    1. Step 1: 17 inch lbs. (2 Nm).
    2.  
    3. Step 2: 81-104 inch lbs. (9-12 Nm).
    4.  

  4.  


NOTE
When installing the timing chain and sprockets, align the marks on the sprockets with the colored links of the chain.

  1. Install or connect the following:

    Camshaft sprockets with the timing chain and torque the bolts to 123-130 ft. lbs. (167-177 Nm). Install the chain guide between both camshaft sprockets. The alignment marks on the upper portion of the timing chain should now be aligned with the marks on the sprockets.
     
    Rocker cover
     
    Distributor
     
    Spark plugs and wires
     
    Upper radiator hose and cooling fan
     
    Alternator
     
    Vacuum hoses, fuel lines and electrical connectors
     
    Air cleaner assembly
     
    Negative battery cable
     

  2.  
  3. Fill the cooling system.
  4.  
  5. Start the vehicle, check for leaks and repair if necessary.
  6.  


    Click image to see an enlarged view

    Fig. Tighten the camshaft bearing caps in sequence to prevent damage to the camshaft and cylinder head-2.4L engines


  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 coolant from the engine and radiator.
  6.  
  7. Remove or disconnect the following:

    Negative battery cable
     
    Air intake ducts and the air cleaner assembly
     
    Vacuum hoses, fuel hoses, wires, harness and connectors that are necessary for removal of the rocker cover
     
    Alternator and mounting bracket
     
    Upper radiator hose and cooling fan
     

  8.  
  9. Set the No. 1 piston at Top Dead Center (TDC) on its compression stroke.
  10.  
  11. Remove or disconnect the following:

    Spark plug wires from the spark plugs
     
    Distributor assembly. Matchmark and note the positioning of the distributor rotor and housing to the engine block before removing the distributor
     
    Rocker cover by loosening the bolts in the reverse order of installation
     

  12.  
  13. Wire the chain to the sprocket so the chain does not fall off during sprocket removal. Hold the flats of the camshaft with a wrench just behind the first camshaft bearing cap. Loosen the bolts and remove the sprockets.
  14.  
  15. Remove or disconnect the following:
    NOTE
    The stoppers on camshaft covers prevent the upper timing chain from disengaging from the idle sprocket. Also, after removal of the camshaft sprockets, note the positioning of the pins at the end of the camshafts for reinstallation purposes.


    NOTE
    All the valvetrain components must be reassembled in their original positions.



    Camshaft sprockets
     



    Camshaft bearing caps in reverse order of installation
     
    Camshafts. The camshaft brackets must be loosened in the correct sequence to prevent damage to the camshaft
     



    Valve lifter adjusting shims from the tops of the of the lifters. Be sure to note the location and positioning of each shim.
     
    Valve lifters from the bores in the cylinder heads. Be sure to note the location and positioning of each lifter
     

  16.  
  17. Check the diameter of the valve lifter and the valve lifter bore and compare to the following specifications.
  18.  
  19. The valve lifter diameter should be 1.3370-1.3376 in. (33.960-33.975mm).
  20.  
  21. The lifter guide bore diameter should be 1.3386-1.3394 in. (33.960-33.975mm).
  22.  
  23. The valve lifter to lifter guide bore clearance should be 0.0010-0.0024 in. (0.025-0.061mm).
  24.  

To install:


NOTE
When installing the valve components, apply a coat of clean engine oil to the component.

  1. Install or connect the following:

    Lifters into the lifter bores from which they were removed
     
    Valve shims to the lifters from which they came
     

  2.  
  3. Install the camshafts in the same position as noted during removal and camshaft bearing caps; torque cap bolts in the proper sequence as follows:
    1. Step 1: 17 inch lbs. (2 Nm).
    2.  
    3. Step 2: 81-104 inch lbs. (9-12 Nm).
      NOTE
      When installing the timing chain and sprockets, align the marks on the sprockets with the colored links of the chain.

    4.  

  4.  
  5. Install or connect the following:

    Camshaft sprockets with the timing chain and torque the bolts to 123-130 ft. lbs. (167-177 Nm). Install the chain guide between both camshaft sprockets. The alignment marks on the upper portion of the timing chain should now be aligned with the marks on the sprockets
     
    Rocker cover
     
    Distributor
     
    Spark plugs and wires
     
    Upper radiator hose and cooling fan
     
    Alternator
     
    Vacuum hoses, fuel lines and electrical connectors
     
    Air cleaner assembly
     
    Negative battery cable
     

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

    Click image to see an enlarged view

    Fig. Tighten the camshaft bearing caps in sequence to prevent damage to the camshaft and cylinder head-2.4L engines

  10.  

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

    Negative battery cable
     
    Air intake ducts and the air cleaner assembly
     
    Vacuum hoses, fuel hoses, wires, harness and connectors that are necessary for removal of the valve cover
     
    Alternator and mounting bracket
     
    Upper radiator hose and cooling fan
     

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

    Spark plug wires from the spark plugs
     
    Distributor assembly. Matchmark and note the positioning of the distributor rotor and housing to the engine block before removing the distributor.
     
    Valve cover by loosening the bolts in the reverse order of installation
     

  10.  
  11. Wire the chain to the sprocket so the chain does not fall off during sprocket removal. Hold the flats of the camshaft with a wrench just behind the first camshaft bearing cap. Loosen the bolts and remove the sprockets.
    NOTE
    The stoppers on camshaft covers prevent the upper timing chain from disengaging from the idle sprocket. Also, after removal of the camshaft sprockets, note the positioning of the pins at the end of the camshafts for reinstallation purposes.


    NOTE
    All the valvetrain components must be reassembled in their original positions.



    Camshaft sprockets
     



    Camshaft bearing caps in reverse order of installation
     
    Camshafts. The camshaft brackets must be loosened in the correct sequence to prevent damage to the camshaft.
     



    Valve lifter adjusting shims from the tops of the of the lifters. Be sure to note the location and positioning of each shim.
     
    Valve lifters from the bores in the cylinder heads. Be sure to note the location and positioning of each lifter.
     

  12.  
  13. Check the diameter of the valve lifter and the valve lifter bore and compare to the following specifications.
  14.  
  15. The valve lifter diameter should be 1.3370-1.3376 in. (33.960-33.975mm).
  16.  
  17. The lifter guide bore diameter should be 1.3386-1.3394 in. (33.960-33.975mm).
  18.  
  19. The valve lifter to lifter guide bore clearance should be 0.0010-0.0024 in. (0.025-0.061mm).
  20.  

To install:


NOTE
When installing the valve components, apply a coat of clean engine oil to the component.

  1. Install or connect the following:

    Lifters into the lifter bores from which they were removed
     
    Valve shims to the lifters from which they came
     

  2.  
  3. Install the camshafts in the same position as noted during removal and camshaft bearing caps; torque cap bolts in the proper sequence as follows:
    1. Step 1: 17 inch lbs. (2 Nm).
    2.  
    3. Step 2: 81-104 inch lbs. (9-12 Nm).
      NOTE
      When installing the timing chain and sprockets, align the marks on the sprockets with the colored links of the chain.

    4.  

  4.  
  5. Install or connect the following:

    Camshaft sprockets with the timing chain and torque the bolts to 123-130 ft. lbs. (167-177 Nm). Install the chain guide between both camshaft sprockets. The alignment marks on the upper portion of the timing chain should now be aligned with the marks on the sprockets.
     
    Valve cover
     
    Distributor
     
    Spark plugs and wires
     
    Upper radiator hose and cooling fan
     
    Alternator
     
    Vacuum hoses, fuel lines and electrical connectors
     
    Air cleaner assembly
     
    Negative battery cable
     

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

    Click image to see an enlarged view

    Fig. Tighten the camshaft bearing caps in sequence to prevent damage to the camshaft and cylinder head-2.4L engines

  10.  

 
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