Infiniti Car 1998-05

Camshaft, Bearings & Lifters 3

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Removal & Installation



3.5L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Relieve the fuel system pressure.
  4.  
  5. Drain the engine oil.
  6.  
  7. Drain the cooling system.
  8.  
  9. Remove or disconnect the following:
    NOTE
    Before disconnecting any hoses or connectors, note the locations for reassembly.



    Negative battery cable
     
    Left side rocker cover ornament
     



    Air duct to intake manifold hose, collector hose, blow-by hose, and vacuum hoses
     
    Fuel hoses and disconnect the harness connection
     
    Evaporative emissions (EVAP) canister purge hoses
     
    Water hoses from the cylinder head and intake manifold
     
    Ignition coils
     
    Spark plugs
     
    Exhaust Gas Recirculation (EGR) tube
     
    Intake manifold collector supports and the collector

    Click image to see an enlarged view

    Fig. To avoid camshaft damage, loosen the bearing cap bolts in the sequence shown-3.5L engine, except G35

     
    Fuel tube
     
    Intake manifold
     
    Rocker arm covers
     
    Engine undercover
     
    Right front wheel
     
    Engine side covers
     
    Drive belts and idler pulley
     
    Power steering oil pump and belt
     
    Camshaft Position (CMP) sensor (PHASE) and Crankshaft Position (CKP) sensors (REF)/(POS)
     

  10.  
  11. Set the No. 1 piston to Top Dead center (TDC) of compression stroke by rotating the crankshaft.

    Ring gear cover access plate
     

  12.  
  13. Loosen the crankshaft pulley bolt while securing the ring gear so the crankshaft cannot rotate.
    NOTE
    Use care not to damage the ring gear teeth.



    Crankshaft pulley, using a suitable puller
     
    A/C compressor and bracket
     
    Front exhaust pipe and install engine slingers
     

  14.  
  15. Support the transaxle with jack.

    Right side engine mounting bracket
     
    Center crossmember assembly
     
    Oil pan bolts and oil pans
     
    Timing chain
     
    O-rings from the front of the engine block
     

  16.  
  17. Loosen the camshaft bearing caps in several steps. The bearing caps MUST be loosened in sequence.
    NOTE
    Keep all bearing caps and camshafts in proper order for reinstallation.


    NOTE
    The valve adjusters have a replaceable shim on the top of the adjuster. Note the proper locations of each shim to adjuster and remove the shims from the adjusters.



    Left-hand and right-hand camshaft tensioners from the cylinder head
     
    Camshafts from the cylinder heads
     



    Valve adjusting shim from the adjuster, using a magnet
     
    Adjuster assembly from the bore. Be sure to note the locations from where each adjuster came.
     

  18.  
  19. Check the diameter of the valve adjuster and the valve adjuster guide bore.
  20.  
  21. The diameter of the adjuster should be 1.3764-1.3770 in. (34.960-34.975mm) and the diameter of the bore should be 1.3780-1.3788 in. (35.000-35.021mm).

    All traces of liquid gasket from the timing chain case and from the water pump covers
     
    All traces of liquid gasket from the engine block
     

  22.  
  23. Inspect the camshafts for excessive wear or damage and replace as necessary.
  24.  

To install:

  1. Lubricate the valve adjusters with clean engine oil and install the adjusters into the bore from which they were removed.
  2.  
  3. Lubricate the valve adjuster shims with clean engine oil and install the shims into the adjuster from which they were removed.
  4.  
  5. Turn the crankshaft clockwise until the No. 1 piston is set 240° before TDC on compression stroke.
  6.  
  7. Install or connect the following:
    NOTE
    The camshafts can be identified by the paint marks on the camshaft. The left cylinder head camshafts have a YELLOW paint mark and the right cylinder head camshafts have a WHITE paint mark. When installing the camshafts, position the camshaft dowel pins at the 12 o'clock position in respect to the cylinder head angle.



    Camshaft tensioners on both sides of the cylinder heads. Torque the tensioner mounting bolts to 75-96 inch lbs. (8-11 Nm).
     



    Click image to see an enlarged view

    Fig. Positioning of the camshaft dowel pins during installation-I35



    Exhaust and intake camshafts and install the bearing caps. Before installing the No. 1 bearing cap, apply liquid gasket to the corners of the cap.
     

  8.  
  9. Torque the camshaft bearing caps as follows:
    1. Nos. 7 through 10 then, Nos. 1 through 6 to 17 inch lbs. (2 Nm).
    2.  
    3. All bolts in order to 52 inch lbs. (6 Nm).
    4.  
    5. Nos. 1 though 6 to 80-104 inch lbs. (9-11 Nm).
    6.  
    7. Nos. 7 though 10 to 74-91 inch lbs. (9-11 Nm).

      Click image to see an enlarged view

      Fig. Be sure to tighten the camshaft bearing cap bolts in the correct sequence- I35, right cylinder head



      Click image to see an enlarged view

      Fig. Tighten the camshaft bearing cap bolts in the correct sequence-I35, left cylinder head



      New O-rings to the front of the engine block
       

    8.  

  10.  
  11. Apply sealant to the hatched portion of the of the rear timing chain case.


  12.  
  13. Align the rear timing chain case with the dowel pins and install onto the cylinder heads and engine block. Torque the rear timing chain case mounting bolts in sequence to 105-121 inch lbs. (11.8-13.7 Nm).

    Crankshaft sprocket with the mating mark facing out
     

  14.  
  15. Rotate the crankshaft clockwise and position the crankshaft to TDC of compression stroke and align the dowels of the camshaft sprockets to the 12 o'clock position in respect to the cylinder head

    Lower chain guide on the dowel pin with the front mark on the guide facing upward
     

  16.  
  17. On a workbench, align the marks on the intake and exhaust camshaft sprockets with the marks of the chain.
    NOTE
    Leave the bolts unattended for 30 minutes or more after tightening.



    Exhaust camshaft sprockets onto the dowel pin. Torque the bolts to 88-95 ft. lbs. (120-129 Nm). Be sure to secure the camshafts while tightening the bolts.
     
    Align and install the timing chains and sprockets to the camshafts
     
    Timing cover evenly and gently. Be sure to align the dowel pin holes
     

  18.  
  19. Apply a 0.091-0.130 in. (2.3-3.3mm) continuous bead of liquid gasket to the water pump cover and install the cover. Tighten the bolts to 84-108 inch lbs. (10-13 Nm).

    Rocker covers
     

  20.  
  21. Apply sealant to the front and rear seal of the oil pan and install the oil pan.

    Center crossmember assembly
     
    Right side engine mounting bracket and mount assembly
     
    Engine slinger assembly
     
    Front exhaust pipe and its support
     
    Air conditioning compressor and bracket
     
    Crankshaft pulley to the crankshaft and install the mounting bolt
     

  22.  
  23. Torque the mounting bolt to 14-22 ft. lbs. (20-29 Nm). Torque the crankshaft bolt an additional 60-66° clockwise. This is approximately the angle from 1 hexagon bolt head corner to another.

    Ring gear cover plate
     
    CMP sensor (PHASE) and CKP sensors
     
    Power steering pump assembly, drive belts and the idler pulley
     
    Engine side cover
     
    Right front wheel
     
    Engine undercover
     
    Intake manifold, using new gaskets
     
    Fuel tube assembly using new insulators. Torque the bolts in several steps to 15-20 ft. lbs. (21-26 Nm).
     
    Intake manifold collector gasket with the arrow facing forward
     
    Intake manifold collector assembly and support bracket
     
    EGR tube using new insulators. Torque the bolts in two steps to 15-20 ft. lbs. (21-26 Nm).
     
    Spark plugs and ignition coils. Torque the bolts to 27-33 inch lbs. (2.9-3.8 Nm).
     
    Water hoses to the cylinder head and intake manifold
     
    Fuel hoses and wiring harness connections to the fuel rail
     
    Air duct to intake manifold hose, collector hose, blow-by hose, and vacuum hoses
     
    Negative battery cable
     

  24.  
  25. Fill the engine with clean oil.
  26.  
  27. Fill and bleed the cooling system.
  28.  
  29. Start the engine and run at 3000 RPM under no load to purge the air from the high pressure chamber. The engine may produce a rattling noise. This indicates that air still remains in the chamber and is not a matter of concern.
  30.  

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Drain the engine oil and cooling system.
  4.  
  5. Relieve the fuel system pressure.
  6.  
  7. Remove or disconnect the following:
    NOTE
    Before removal, matchmark the position of the camshafts, brackets and bolts, so they are reinstalled in their original locations.



    Negative battery cable
     
    Front timing chain case
     
    Camshaft sprocket
     
    Timing chain
     
    Rear timing chain case
     
    Camshaft Position (CMP) sensors (PHASE) from the back side of the cylinder heads
     
    Intake valve timing control solenoid valves from the No. 1 camshaft bracket

    Click image to see an enlarged view

    Fig. Location of the intake valve timing control solenoid valves-G35

     



    Intake and exhaust camshaft brackets. Loosen the bolts in several stages, in reverse of the sequence shown.

    Click image to see an enlarged view

    Fig. Intake and exhaust camshaft bracket bolts tightening sequence. Use the reverse sequence for removal-G35

     
    Camshafts
     
    Valve lifters if necessary, noting their installed positions
     

  8.  

To install:

  1. Install or connect the following:

    Valve lifters, in their original positions
     
    Camshafts with the dowel pin attached to its front end face on the exhaust side

    Click image to see an enlarged view

    Fig. Camshaft identification and installation-G35

     
    Camshaft brackets, as shown in the illustration

    Click image to see an enlarged view

    Fig. Camshaft bracket installation-G35

     

  2.  
  3. Torque the camshaft bracket bolts, in sequence, as follows:
    1. Step 1: Nos. 7-10, then Nos. 1-6 to 17 inch lbs. (2 Nm).
    2.  
    3. Step 2: Nos. 1-10 to 52 inch lbs. (5.9 Nm).
    4.  
    5. Step 3: Nos. 1-6 to 80-104 inch lbs. (9-12 Nm).
    6.  
    7. Step 4: Nos. 7-10 to 74-91 inch lbs.
    8.  

  4.  
  5. Measure the difference in levels between the front end faces of the No. 1 camshaft bracket and the cylinder head. If the measurement falls out of the range of -0.0055-0.0055 in. (-0.14-0.14mm), you must reinstall the camshaft and brackets.
  6.  
  7. Check and adjust the valve clearance.

    Intake valve timing control solenoid valves
     
    CMP sensors (PHASE)
     
    Rear timing chain case, timing chain, camshaft sprocket and front timing chain case
     
    Negative battery cable
     

  8.  
  9. Fill the engine with oil.
  10.  
  11. Fill and bleed the cooling system.
  12.  
  13. Start the vehicle, check for leaks and repair if necessary.
  14.  

4.1L 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
     
    Ornament cover
     
    Undercover
     
    Radiator and cooling fan
     
    Inlet and outlet hoses
     
    Alternator belt and idler bracket
     
    Air duct and intake manifold collector
     
    Intake valve timing control solenoid
     
    Rocker arm covers
     
    Vacuum pipe
     
    Ignition coils and spark plugs
     

  8.  
  9. Turn the crankshaft to position the No. 1 piston at Top Dead Center TDC on compression.

    Camshaft Position (CMP) sensor
     
    Upper front covers
     

  10.  
  11. Paint alignment marks on the timing chain and camshaft sprockets.

    Upper chain tensioners
     
    Camshaft sprockets
     
    Camshaft bearing cap bolts in the proper sequence to prevent damage to the camshaft. Keep the caps in order so they can be installed in the correct locations.
     
    Camshafts, rocker arms and lash adjusters. The lash adjusters and rocker arms must be installed in their original positions. Keep them in order.
     

  12.  


    Click image to see an enlarged view

    Fig. Camshaft bearing cap bolt numbered identification and loosening sequence-4.1L engine, right bank



    Click image to see an enlarged view

    Fig. Camshaft bearing cap bolt numbered identification and loosening sequence-4.1L engine, left bank


To install:

  1. Install or connect the following:

    Lash adjusters and rocker arms
     

  2.  
  3. Lubricate the camshafts with engine oil and place them on the cylinder head with the knock pins facing away from the crankshaft.
  4.  
  5. Install the bearing caps in their original positions and torque the bolts as follows:
    1. Nos. 9 and 10, then 1 through 8: 17 inch lbs. (2 Nm).
    2.  
    3. All bolts in order: 52 inch lbs. (6 Nm).
    4.  
    5. All bolts in order: 96-121 inch lbs. (11-14 Nm).
    6.  

  6.  
  7. Install or connect the following:

    Camshaft sprockets. Torque the intake sprocket bolt to 76-83 ft. lbs. (103-113 Nm) and the exhaust sprocket bolt to 12-15 ft. lbs. (16-21 Nm).
     
    Chain tensioner. Torque the bolts to 82-95 ft. lbs. (9-11 Nm).
     
    Upper chain covers
     
    Rocker covers using new gaskets
     
    Valve timing control solenoid valve using a new O-ring. Torque the solenoid to 18-25 ft. lbs. (25-34 Nm).
     
    Air duct and intake manifold collector
     
    Alternator belt and idler bracket
     
    Inlet and outlet hoses
     
    Spark plugs and ignition coils
     
    Rocker arm covers
     
    Vacuum pipe
     
    Radiator and cooling fan
     
    Engine undercover
     
    Ornament cover
     
    Negative battery cable
     

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


    Click image to see an enlarged view

    Fig. When installing the camshafts, position the knock pins as shown-4.1L engine



    Click image to see an enlarged view

    Fig. Camshaft bearing cap bolt numbered identification and tightening sequence-4.1L engine, right bank



    Click image to see an enlarged view

    Fig. Camshaft bearing cap bolt numbered identification and tightening sequence-4.1L engine, left bank


  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.
  6.  
  7. Remove or disconnect the following:

    Negative battery cable
     
    Ornament cover
     
    Undercover
     
    Radiator and cooling fan
     
    Inlet and outlet hoses
     
    Alternator belt and idler bracket
     
    Air duct and intake manifold collector
     
    Intake valve timing control solenoid
     
    Rocker arm covers
     
    Vacuum pipe
     
    Ignition coils and spark plugs
     

  8.  
  9. Turn the crankshaft to position the No. 1 piston at Top Dead Center TDC on compression.

    Camshaft Position (CMP) sensor
     
    Upper front covers
     

  10.  
  11. Paint alignment marks on the timing chain and camshaft sprockets.

    Upper chain tensioners
     
    Camshaft sprockets
     
    Camshaft bearing cap bolts in the proper sequence to prevent damage to the camshaft. Keep the caps in order so they can be installed in the correct locations.
     
    Camshafts, rocker arms and lash adjusters. The lash adjusters and rocker arms must be installed in their original positions. Keep them in order

    Click image to see an enlarged view

    Fig. Camshaft bearing cap bolt numbered identification and loosening sequence-4.1L engine, right bank



    Click image to see an enlarged view

    Fig. Camshaft bearing cap bolt numbered identification and loosening sequence-4.1L engine, left bank

     

  12.  

To install:

  1. Install or connect the following:

    Lash adjusters and rocker arms
     

  2.  
  3. Lubricate the camshafts with engine oil and place them on the cylinder head with the knock pins facing away from the crankshaft.

    Click image to see an enlarged view

    Fig. When installing the camshafts, position the knock pins as shown-4.1L engine




  4.  
  5. Install the bearing caps in their original positions and torque the bolts as follows:
    1. Nos. 9 and 10, then 1 through 8: 17 inch lbs. (2 Nm).
    2.  
    3. All bolts in order: 52 inch lbs. (6 Nm).
    4.  
    5. All bolts in order: 96-121 inch lbs. (11-14 Nm).

      Click image to see an enlarged view

      Fig. Camshaft bearing cap bolt numbered identification and tightening sequence-4.1L engine, right bank



      Click image to see an enlarged view

      Fig. Camshaft bearing cap bolt numbered identification and tightening sequence-4.1L engine, left bank

    6.  

  6.  
  7. Install or connect the following:

    Camshaft sprockets. Torque the intake sprocket bolt to 76-83 ft. lbs. (103-113 Nm) and the exhaust sprocket bolt to 12-15 ft. lbs. (16-21 Nm)
     
    Chain tensioner. Torque the bolts to 82-95 ft. lbs. (9-11 Nm)
     
    Upper chain covers
     
    Rocker covers using new gaskets
     
    Valve timing control solenoid valve using a new O-ring. Torque the solenoid to 18-25 ft. lbs. (25-34 Nm)
     
    Air duct and intake manifold collector
     
    Alternator belt and idler bracket
     
    Inlet and outlet hoses
     
    Spark plugs and ignition coils
     
    Rocker arm covers
     
    Vacuum pipe
     
    Radiator and cooling fan
     
    Engine under cover
     
    Ornament cover
     
    Negative battery cable
     

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

  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
     
    Ornament cover
     
    Undercover
     
    Radiator and cooling fan
     
    Inlet and outlet hoses
     
    Alternator belt and idler bracket
     
    Air duct and intake manifold collector
     
    Intake valve timing control solenoid
     
    Rocker arm covers
     
    Vacuum pipe
     
    Ignition coils and spark plugs
     

  8.  
  9. Turn the crankshaft to position the No. 1 piston at Top Dead Center TDC on compression.

    Camshaft Position (CMP) sensor
     
    Upper front covers
     

  10.  
  11. Paint alignment marks on the timing chain and camshaft sprockets.

    Upper chain tensioners
     
    Camshaft sprockets
     
    Camshaft bearing cap bolts in the proper sequence to prevent damage to the camshaft. Keep the caps in order so they can be installed in the correct locations.
     
    Camshafts, rocker arms and lash adjusters. The lash adjusters and rocker arms must be installed in their original positions. Keep them in order

    Click image to see an enlarged view

    Fig. Camshaft bearing cap bolt numbered identification and loosening sequence-4.1L engine, right bank



    Click image to see an enlarged view

    Fig. Camshaft bearing cap bolt numbered identification and loosening sequence-4.1L engine, left bank

     

  12.  

To install:

  1. Install or connect the following:

    Lash adjusters and rocker arms
     

  2.  
  3. Lubricate the camshafts with engine oil and place them on the cylinder head with the knock pins facing away from the crankshaft.

    Click image to see an enlarged view

    Fig. When installing the camshafts, position the knock pins as shown-4.1L engine




  4.  
  5. Install the bearing caps in their original positions and torque the bolts as follows:
    1. Nos. 9 and 10, then 1 through 8: 17 inch lbs. (2 Nm).
    2.  
    3. All bolts in order: 52 inch lbs. (6 Nm).
    4.  
    5. All bolts in order: 96-121 inch lbs. (11-14 Nm).

      Click image to see an enlarged view

      Fig. Camshaft bearing cap bolt numbered identification and tightening sequence-4.1L engine, right bank



      Click image to see an enlarged view

      Fig. Camshaft bearing cap bolt numbered identification and tightening sequence-4.1L engine, left bank

    6.  

  6.  
  7. Install or connect the following:

    Camshaft sprockets. Torque the intake sprocket bolt to 76-83 ft. lbs. (103-113 Nm) and the exhaust sprocket bolt to 12-15 ft. lbs. (16-21 Nm)
     
    Chain tensioner. Torque the bolts to 82-95 ft. lbs. (9-11 Nm)
     
    Upper chain covers
     
    Rocker covers using new gaskets
     
    Valve timing control solenoid valve using a new O-ring. Torque the solenoid to 18-25 ft. lbs. (25-34 Nm)
     
    Air duct and intake manifold collector
     
    Alternator belt and idler bracket
     
    Inlet and outlet hoses
     
    Spark plugs and ignition coils
     
    Rocker arm covers
     
    Vacuum pipe
     
    Radiator and cooling fan
     
    Engine under cover
     
    Ornament cover
     
    Negative battery cable
     

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

 
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