Nissan Frontier, Xterra 1998-05

Camshaft, Bearings & Lifters 2

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Removal & Installation



4.0L Engine
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Properly relieve the fuel system pressure.
  4.  
  5. Disconnect the negative battery cable. Remove the engine cover.
  6.  
  7. Remove the front timing chain case, camshaft sprocket, timing chain and rear timing chain case.
  8.  
  9. Remove the camshaft position sensor (PHASE) from the cylinder head back side.
    NOTE
    Handle carefully to avoid dropping and shocks. Do not disassemble. Do not place in a location where the sensor can be exposed to magnetism.

  10.  
  11. Remove the intake manifold collector.
  12.  
  13. Separate the engine harness and remove their brackets from the rocker covers. Remove the harness bracket from the cylinder head, if necessary.
  14.  
  15. Remove the ignition coil. Remove the PCV hoses. Remove the oil filler cap, if necessary.
  16.  
  17. Loosen the rocker cover retaining bolts, in the reverse order of the tightening sequence.
  18.  
  19. Remove the rocker covers from the engine.
  20.  
  21. Remove the intake valve timing control solenoid valves. Discard the gaskets.
  22.  
  23. Mark the camshaft brackets and bolts for reinstallation. Remove the camshaft bracket bolts. Be sure to remove the bolts by reversing the order of the tightening torque sequence and in several steps.
  24.  
  25. Remove the camshafts.
  26.  
  27. If required, remove the valve lifters. Identify them for reinstallation in their original locations.
  28.  
  29. Remove the timing chain tensioner (secondary) from the cylinder head. Remove the timing chain tensioner (secondary) with its stopper pin attached.
  30.  

To install:

  1. Inspect the camshafts, replace as required.
  2.  
  3. Install the timing chain tensioners (secondary) on both sides of the cylinder head. Be sure to use new O-rings.
    NOTE
    Install the tensioner with its stopper pin attached. Install the tensioner with the sliding part facing downward on the right cylinder head and with the sliding part facing upward on the left cylinder head.

  4.  
  5. Install the valve lifters, in their original bores.
  6.  
  7. Install the camshafts, with the dowel pin attached to its front end face on the exhaust side.
    NOTE
    Follow the identification marks for proper placement and direction.



    Click image to see an enlarged view

    Fig. Camshaft identification-4.0L engine

  8.  
  9. Install the camshaft so that the dowel pin hole and dowel pin on the front end face are positioned as shown in the illustration (No.1 piston at TDC on its compression stroke).
    NOTE
    Large and small pin holes are located on the front end face of the camshaft (INT), at intervals of 180 degrees. Face small diameter side pin hole upward (in cylinder head upper face direction).


    NOTE
    Though the camshaft does not stop at the portion as shown, for placement of the cam nose, it is generally accepted that the camshaft is placed for the same direction as shown.



    Click image to see an enlarged view

    Fig. Camshaft dowel pin positioning-4.0L engine

  10.  
  11. Install the camshaft brackets in the same position that they were removed. Install brackets No.2-No.4 aligning the stamp marks as indicated in the illustration.
    NOTE
    There are no identification marks indicating left or right for camshaft bracket No.1.



    Click image to see an enlarged view

    Fig. Camshaft bearing cap identification-4.0L engine

  12.  
  13. Apply liquid gasket to the mating surfaces of camshaft bracket No.1 as shown in the illustration on both the left and right cylinder heads. Be sure to use genuine RTV sealant, or equivalent.

    Click image to see an enlarged view

    Fig. Camshaft sealant application and location-4.0L engine

  14.  
  15. Tighten the camshaft bracket bolts in the proper sequence and to specification.
    1. Bolts 7-10 to 17 inch lbs.
    2.  
    3. Bolts 1-6 to 17 inch lbs.
    4.  
    5. All bolts to 52 inch lbs.
    6.  
    7. All bolts to 92 inch lbs.
    8.  



    Click image to see an enlarged view

    Fig. Camshaft bearing bracket bolt torque sequence-4.0L engine

  16.  
  17. Measure the difference in levels between the front end faces of the camshaft bracket No.1 and the cylinder head. Specification should be -0.0055-0.0055 inch. If not within specification, reinstall camshaft bracket No.1.
    NOTE
    Measure two positions (both intake and exhaust side) for a single bank.



    Click image to see an enlarged view

    Fig. Camshaft bracket and cylinder head measurement-4.0L engine

  18.  
  19. Check and adjust valve clearance, as required.
  20.  
  21. Apply liquid gasket, be sure to use genuine RTV silicone sealant or equivalent, to the positions shown in the illustration. Refer to figure -a- to apply liquid gasket to joint part of camshaft bracket No.1 and cylinder head. Refer to figure -b- to apply liquid gasket to the figure -a- squarely.

    Click image to see an enlarged view

    Fig. Rocker cover sealant application locating points-4.0L engine

  22.  
  23. Install the rocker cover. Torque the retaining bolts to 17 inch lbs and than to 74 inch lbs, in the proper sequence.

    Click image to see an enlarged view

    Fig. Rocker cover bolt torque sequence-4.0L engine

  24.  
  25. Continue the installation in the reverse order of the removal procedure.
  26.  
  27. Inspect the camshaft sprocket (INT) oil groove.
    NOTE
    Perform this inspection only when DTC P0011 or DTC P0021 are detected in self diagnostic results of CONSULT-II.

  28.  
  29. Be sure the engine is cold. Check and adjust oil level, as required.
  30.  
  31. Properly release the fuel system pressure. Disconnect the ignition coil and injector harness connectors.
    NOTE
    This is being done to prevent the engine from unintentionally being started while checking.

  32.  
  33. Remove the intake valve timing control solenoid valve.
  34.  
  35. Crank the engine, and then make sure that engine oil comes out from camshaft bracket (No.1) oil hole.
    WARNING
    Be careful not to touch rotating parts, (drive belt, idler pulley, crankshaft pulley etc) as injury could result.


    NOTE
    Oil may squirt from the intake valve timing control solenoid valve installation hole during engine cranking. Use a shop towel to prevent oil from squirting on engine components.

  36.  
  37. Clean the oil groove between the oil strainer and the intake timing control solenoid valve if engine oil does not come out from camshaft bracket (No.1) oil hole.
  38.  
  39. Remove the components between the intake valve timing control solenoid valve and the camshaft sprocket (INT). Check each oil groove for clogging.
  40.  
  41. After inspection install any removed components.

    Click image to see an enlarged view

    Fig. Camshaft bracket (No1) oil hole location

  42.  

 
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