Infiniti Car 1998-05

Timing Chain & Sprockets 2

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Removal & Installation



4.5L 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
     
    Engine from the vehicle
     
    Drive belt tensioner and idler pulley
     
    Thermostat housing
     
    Ignition coils
     
    Cylinder head cover
     
    Intake valve timing control sensor from both sides
     
    Camshaft Position sensor (CMP)
     
    Intake valve timing control solenoid from both sides
     
    Intake valve timing control covers by loosening bolts in the reverse of the tightening sequence
     
    Front cover o-rings
     

  6.  
  7. Turn the crankshaft pulley clockwise until No. 1 cylinder is on the compression stroke. The TDC mark on the pulley without the paint mark should align with the timing pointer.
  8.  
  9. Verify the correct TDC position by ensuring that the lobes of the No. 1 cylinder camshafts are pointing outward. If not rotate the crankshaft 360° until the lobes are correct.
  10.  
  11. Remove the oil pan rear plate cover and install a locking tool into the drive gear.
  12.  
  13. Remove the crankshaft pulley.
  14.  
  15. Remove the oil pan and strainer
  16.  
  17. Loosen and remove the front cover bolts in the reverse of the tightening sequence.
  18.  
  19. Remove the front cover and pry out the front cover oil seal.
  20.  
  21. Remove the 3 O-rings from the cylinder heads and block.
  22.  
  23. Remove the chain tensioner cover from the front cover.
  24.  
  25. Remove the oil pump drive spacer and oil pump.
  26.  
  27. Compress the left side chain tensioner and install a pin through the hole to secure it, then remove the tensioner.
  28.  
  29. Remove the chain tensioner, tension guide and slack guide.
  30.  
  31. Remove the left side timing chain.
  32.  
  33. While holding the camshaft in place, remove the left side camshaft sprockets.
  34.  
  35. Repeat the procedure on the right side to remove the chain tensioner, guides, timing chain and camshaft sprockets.

    Click image to see an enlarged view

    Fig. Exploded view of timing chain and front cover components-4.5L engine



    Click image to see an enlarged view

    Fig. Front cover bolt identification-4.5L engine



    Click image to see an enlarged view

    Fig. Front cover bolt tightening sequence-4.5L engine

  36.  

To install:

  1. Be sure the crankshaft key is pointing toward the center of the left bank. This should be a 45° angle from the center. Check that the camshaft dowel pins are in the correct location as shown.

    Click image to see an enlarged view

    Fig. Aligning crankshaft key and camshaft dowel pins-4.5L engine



    Click image to see an enlarged view

    Fig. Timing chain and sprocket alignment marks-4.5L engine

  2.  
  3. Install or connect the following:

    Camshaft sprockets by holding the camshaft with a wrench and tightening the sprocket bolts to 112 ft. lbs. (152 Nm).
     
    Crankshaft sprockets and be sure the thick side of the sprocket faces the cylinder block to provide clearance between the block and chain.
     
    Right bank timing chain by aligning the marks on the chain with the marks on the sprockets
     
    Right slack and chain guides. Be sure to install the bolts in the correct locations. Torque the bolts to 10-14 ft. lbs. (13-19 Nm).
     
    Timing chain for the left bank in the same manner as the right one
     
    Left slack and chain guide. Torque the bolts to 10-14 ft. lbs. (13-19 Nm).
     
    Chain tensioners with the pins installed using new gaskets. Torque the bolts to 61 inch lbs. (6.9 Nm) and remove the pins.
     




  4.  
  5. Confirm that the timing marks on the crankshaft sprockets and chains are still aligned.

    Oil pump and tighten the bolts to 78 inch lbs. (9 Nm).
     
    Oil pump drive spacer, aligning the spacer key groove with the crankshaft key, and tapping it in with a plastic hammer
     
    New seal into the front cover until it is flush with the cover face
     
    Chain tensioner cover after applying liquid gasket to the mating surface. Tighten the bolts to 78 inch lbs. (9 Nm).
     
    New O-rings into the block and cylinder heads
     
    Front cover after applying liquid gasket to the mating surface. Be sure to install the bolts in the correct locations. Tighten the bolts in sequence to 78 inch lbs. (9 Nm).
     
    Timing control cover using new O-rings and after applying liquid gasket to the mating surface. Tighten the bolts in sequence to 97 inch lbs. (11 Nm).

    Click image to see an enlarged view

    Fig. Timing control cover tightening sequence-4.5L engine

     
    Intake valve timing control sensor to both sides
     
    Camshaft Position sensor (CMP)
     
    Intake valve timing control solenoid to both sides
     

  6.  
  7. Install the crankshaft pulley so it aligns with the dowel pin of the oil pump drive spacer.
  8.  
  9. Apply clean engine oil the crankshaft pulley bolt and tighten the bolt to 69 ft. lbs. (93 Nm), plus an additional 90°.
  10.  
  11. Installation of the remaining components is the reverse of the removal procedure.
  12.  
  13. Fill the engine with clean oil.
  14.  
  15. Fill and bleed the cooling system.
  16.  
  17. Start the engine and check for proper operation.
  18.  

 
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