Infinity_FX35_FX45_2003-2005

Camshaft & Valve Lifters (2 of 2)

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Removal & Installation



3.5L Engine


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Fig. Exploded view of camshaft and related components-3.5L engine



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Fig. O-ring positions-3.5L engine



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Fig. If the measurements A and B are out of range, replace the cylinder head or camshaft-3.5L engine



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Fig. Exhaust and intake camshaft differences-3.5L engine



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Fig. Camshaft identification mark locations-3.5L engine



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Fig. Camshaft positioning for installation-3.5L engine



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Fig. Camshaft bracket positions-3.5L engine



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Fig. Camshaft bracket identification mark positions-3.5L engine



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Fig. Liquid gasket positioning for camshaft bracket No. 1 installation-3.5L engine



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Fig. Camshaft bearing cap mounting bolt tightening sequence-3.5L engine

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove the front timing chain case, camshaft sprocket, timing chain and rear timing chain case.
  4.  
  5. If necessary, remove the camshaft position sensor (PHASE) (right and left banks) from the cylinder head back side.
    CAUTION
    Handle the camshaft position sensor carefully to avoid dropping it and exposing it to abrupt or severe shocks. Do not disassemble it, and do not allow metal powder to adhere to magnetic part at the sensor tip. Do not place sensors in a location where they are exposed to magnetism.

  6.  
  7. Remove the intake valve timing control solenoid valve from the No.1 camshaft bracket.
  8.  
  9. Remove the intake and exhaust camshaft brackets. Mark the camshafts, camshaft brackets, and bolts so they are reinstalled in the same position and direction for installation. Loosen the camshaft bracket bolts equally in several steps in the reverse order as shown.
  10.  
  11. Remove the camshaft.
  12.  
  13. Remove the valve lifters. Identify the installation positions, and store them without mixing them up.
  14.  
  15. Remove the secondary timing chain tensioner from the cylinder head.
  16.  
  17. Remove the chain tensioner with its stopper pin attached.
    NOTE
    The stopper pin was attached when the secondary timing chain was removed.

  18.  
  19. Inspect camshaft run out, as follows:
    1. Put a V block on a precise flat bed, and support the No. 2 and No. 4 journals of the camshaft.
      CAUTION
      Do not support journal No. 1 (on the side of camshaft sprocket) because it has a different diameter than the other three locations.

    2.  
    3. Set a dial gauge vertically to the No. 3 journal.
    4.  
    5. Turn the camshaft in one direction by hand, and measure camshaft run out on the dial gauge. (Total indicator reading)
    6.  
    7. If run out exceeds specification, replace the camshaft.
      NOTE
      Camshaft run out limit: 0.0020 in (0.05mm)

    8.  

  20.  
  21. Inspect the camshaft cam height, as follows:
    1. Measure the camshaft cam height.
      NOTE
      Standard cam height (intake and exhaust): 1.7663 - 1.7738 in. (44.865 - 45.055mm). Allowable cam wear limit: 0.008 in. (0.2mm).

    2.  
    3. If wear is beyond specification, replace the camshaft.
    4.  

  22.  
  23. Measure the outer diameter of the camshaft journals.
    NOTE
    Standard outer camshaft journal diameters-No. 1: 1.0211 - 1.0218 in. (25.935 - 25.955mm), Nos. 2, 3 & 4: 0.9230 - 0.9238 in. (23.445 - 23.465mm)

  24.  
  25. Measure the inner diameter of the camshaft bracket journals, as follows:
    1. Tighten the camshaft bracket bolts with the specified torque.
    2.  
    3. Using an inside micrometer, measure the inner diameter A of the camshaft bracket.
    4.  
    5. If the inner camshaft journals exceed allowable specification, replace the cylinder head. The camshaft brackets cannot be replaced as a single part, because it is machined together with the cylinder head. If necessary, replace the whole cylinder head assembly.
      NOTE
      Standard inner diameter-No. 1: 1.0236 - 1.0244 in. (26.000 - 26.021mm), Nos. 2, 3 & 4: 0.9252 - 0.9260 in. (23.500 - 23.521mm)

    6.  

  26.  
  27. Calculate the camshaft journal oil clearance, using the following equation: journal oil clearance = (inner diameter of camshaft bracket) - (outer diameter of camshaft journal).
    1. Subtract the inner diameter of the camshaft bracket from the outer diameter of the camshaft journal.
    2.  
    3. If the oil clearance exceeds the allowable limit, replace either the cylinder head or camshaft or both, if necessary.
      NOTE
      Standard oil clearance-No. 1: 0.0018 - 0.0034 in. (0.045 - 0.086mm), Nos. 2, 3 & 4: 0.0014 - 0.0030 in. (0.035 - 0.076mm), Maximum limit: 0.0059 in. (0.15mm)

    4.  

  28.  
  29. Inspect camshaft end-play, as follows:
    1. Install a dial indicator in the thrust direction on the front end of the camshaft.
    2.  
    3. Measure the end play on the dial indicator when the camshaft is moved forward and backward (in direction to axis).
      NOTE
      Camshaft end-play standard: 0.0045 - 0.0074 in. (0.115 - 0.188mm), limit: 0.0094 in. (0.24mm).

    4.  
    5. Measure the following parts if the camshaft end-play exceeds specifications, and replace the camshaft and/or cylinder if the following measurements are out of specification:

      Dimension A for camshaft No. 1 journal-Standard: (1.0827 - 1.0846 in. (27.500 - 27.548mm).
       
      Dimension B for cylinder head No. 1 journal-Standard: 1.0772 - 1.0781 in. (27.360 - 27.385mm).
       

    6.  

  30.  
  31. Inspect camshaft sprocket run out, as follows:
    1. Put a V-block on precise flat table, and support the No. 2 and No. 4 journals of the camshaft.
      NOTE
      Do not support journal No. 1 (on the side of camshaft sprocket) because it has a different diameter than the other three journals.

    2.  
    3. Measure camshaft sprocket run out with a dial indicator. (Total indicator reading), and replace the camshaft sprocket it the run out measurement exceeds specification.
      NOTE
      Camshaft sprocket run out limit : 0.0059 in. (0.15mm).

    4.  

  32.  
  33. Inspect the valve lifters, as follows:
    1. Check the surface of valve lifter for wear or cracks. If any defects are found, replace the valve lifter.
    2.  

  34.  
  35. Inspect valve lifter clearance, as follows:
    1. Measure the outer diameter of each valve lifter.
      NOTE
      Valve lifter outer diameter (Intake and exhaust): 1.3377 - 1.3381 in. (33.977 - 33.987mm).

    2.  
    3. Using an inside micrometer, measure the diameter of valve lifter hole of the cylinder head.
      NOTE
      Valve lifter bore standard (Intake and exhaust): 1.3386 - 1.3392 in. (34.000 - 34.016mm).

    4.  
    5. Calculate the valve lifter clearance by subtracting the valve lifter outer diameter from the valve lifter hole inner diameter. If result exceeds the standard, referring to each standard of valve lifter outer diameter and valve lifter hole diameter, replace either or both valve lifter and cylinder head.
      NOTE
      Valve lifter clearance standard (Intake and exhaust): 0.0005 - 0.0015 in. (0.013 - 0.039mm).

    6.  

  36.  

To install:

  1. Install the secondary chain tensioners on both sides of the cylinder head. Install the chain tensioner with its stopper pin attached. Install the tensioner with the sliding part facing downward on the right-hand cylinder head, and with the sliding part facing upward on the left-hand cylinder head.
  2.  
  3. Install new O-rings as shown.
  4.  
  5. Install the valve lifters. If using the original valve lifters, make sure to install them in their original positions.
  6.  
  7. Install the camshafts. Install camshaft with dowel pin attached to its front end face on the exhaust side. Follow your identification marks made during removal, or follow the identification marks that are present on new camshafts for proper placement and direction. Install the camshaft so that the dowel pin hole and dowel pin on the front end face are positioned as shown in figure (No. 1 cylinder TDC on its compression stroke).
    NOTE
    Large and small pin holes are located on front end face of the intake camshaft, at intervals of 180 degrees. Position the small diameter side pin hole upward (in the cylinder head upper face direction).

  8.  
  9. Install the camshaft brackets. Remove all foreign material completely from the camshaft bracket backside and from the cylinder head installation face. Install the camshaft brackets in their original positions and directions as shown in illustration. Install the No. 2 to 4 camshaft brackets aligning stamp marks as shown.
    NOTE
    There are no identification marks indicating left and right for No. 1 camshaft bracket.

  10.  
  11. Apply sealant to the mating surface of No. 1 camshaft bracket (as shown) on the right and left banks.
    CAUTION
    Use Genuine Thread Sealant or equivalent.

  12.  
  13. Tighten the camshaft brackets in the following steps, in numerical order as shown:
    1. Tighten No. 7 to 10, then tighten No. 1 to 6 in order as shown to 1 ft. lbs. (2 Nm)
    2.  
    3. Tighten all bolts in numerical order to 4 ft. lbs. (6 Nm). c
    4.  
    5. Tighten all bolts in order to 8 ft. lbs. (10 Nm).
      NOTE
      After tightening the mounting bolts of camshaft brackets (No. 1), be sure to wipe off excessive liquid gasket from these parts: mating surface of the rocker cover, mating surface of the rear timing chain case

    6.  

  14.  
  15. Measure the difference in levels between the front end faces of the No. 1 camshaft bracket and cylinder head. If the measurement is outside the specified range, re-install the camshaft and camshaft brackets.
    NOTE
    Camshaft bracket and cylinder head standard: -0.0055 to 0.0055 in. (-0.14 to 0.14 mm)

  16.  
  17. Inspect and adjust the valve clearance.
  18.  
  19. The remainder of installation is the reverse of removal.
  20.  

4.5L Engine


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Fig. Exploded view of the camshaft and related components-4.5L engine



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Fig. If the following measurements are out of specifications, replace the camshaft and/or cylinder head-4.5L engine



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Fig. New camshaft identification marks-4.5L engine



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Fig. Identification mark locations on the camshaft-4.5L engine



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Fig. Camshaft dowel location for installation-4.5L engine



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Fig. Camshaft bearing cap identification-4.5L engine



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Fig. Liquid gasket positioning for No. 1 camshaft bracket installation-4.5L engine



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Fig. Liquid gasket positioning for No. 6 camshaft bracket installation-4.5L engine.



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Fig. Tightening sequence for camshaft bearing caps-4.5L engine



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Fig. Intake and Exhaust camshaft sprocket identification-4.5L engine

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove the engine assembly from vehicle.
  4.  
  5. Remove the timing chain.
  6.  
  7. With the hexagonal part of the camshaft locked with a wrench, loosen the bolts securing the camshaft sprocket, then remove the camshaft sprocket.
    CAUTION
    After removing timing chain, do not turn the crankshaft or camshaft separately, otherwise the valves will strike the piston head.

  8.  
  9. Remove the intake and exhaust camshaft brackets. Mark the camshafts, camshaft brackets and bolts so that they can be installed in their original positions and direction. Equally loosen the camshaft brackets and bolts in several steps in the reverse order of the tightening sequence. Lightly tapping with a plastic hammer, remove camshaft brackets Nos. 1 & 6.
    NOTE
    The bottom surface of each bracket will be stuck to the cylinder head because of liquid gasket.

  10.  
  11. Remove the camshaft.
  12.  
  13. Remove the adjusting shims and valve lifters, if necessary.
  14.  
  15. Identify installation positions, and store all parts without mixing them up.
  16.  
  17. Inspect the camshaft run out, as follows:
    1. Situate a V-block on a precise flat table, and support the camshaft by journals No. 2 and No. 5.
      NOTE
      Do not support the camshaft by journal No. 1 (on the side of camshaft sprocket) since it has a different diameter from the other three locations.

    2.  
    3. Set the dial indicator vertically to measure against journal No. 3.
    4.  
    5. Turn the camshaft in one direction by hand, and measure camshaft the run out on the dial indicator.
    6.  
    7. If run out exceeds the limit, replace the camshaft.
      NOTE
      Camshaft run out limit: 0.0008 in. (0.02mm).

    8.  

  18.  
  19. Inspect the camshaft cam height, as follows:
    1. Measure the camshaft cam height.
      NOTE
      Standard cam height:



      Intake: 1.7663 - 1.7738 in. (44.865 - 45.055mm)
       
      Exhaust: 1.7293 - 1.7368 in. (43.925 - 44.115mm)
       
      Allowable cam wear limit: 0.008 in. (0.2mm).
       

    2.  
    3. If wear is beyond specification, replace the camshaft.
    4.  

  20.  
  21. Measure the outer diameter of the camshaft journals with a micrometer.
    NOTE
    Standard outer camshaft journal diameters:



    No. 1: 1.0212 - 1.0218 in (25.938 - 25.955mm)
     
    Nos. 2, 3 & 4: 1.0218 - 1.0224 in. (25.953 - 25.970mm)
     

  22.  
  23. Measure the inner diameter of the camshaft bracket journals, as follows:
    1. Tighten the camshaft bracket bolts with the specified torque.
    2.  
    3. Using an inside micrometer, measure the inner diameter of the camshaft bracket.
    4.  
    5. If the inner camshaft journals exceed allowable specification, replace the cylinder head. The camshaft brackets cannot be replaced as a single part, because it is machined together with the cylinder head. If necessary, replace the whole cylinder head assembly.
      NOTE
      Standard inner diameter: 1.0236 - 1.0244 in. (26.000 - 26.021mm)

    6.  

  24.  
  25. Calculate the camshaft journal oil clearance, using the following equation: journal oil clearance = (inner diameter of camshaft bracket) - (outer diameter of camshaft journal).
    1. Subtract the inner diameter of the camshaft bracket from the outer diameter of the camshaft journal.
    2.  
    3. If the oil clearance exceeds the allowable limit, replace either the cylinder head or camshaft or both, if necessary.
      NOTE
      Standard oil clearance



      No. 1: 0.0018 - 0.0033 in. (0.045 - 0.083mm)
       
      Nos. 2, 3 & 4: 0.0012 - 0.0027 in. (0.030 - 0.068mm)
       

    4.  

  26.  
  27. Inspect camshaft end-play, as follows:
    1. Install a dial indicator in the thrust direction on the front end of the camshaft.
    2.  
    3. Measure the end play on the dial indicator when the camshaft is moved forward and backward (in direction to axis). Camshaft end-play standard: 0.0045 - 0.0074 in. (0.115 - 0.188mm).
    4.  
    5. Measure the following parts if the camshaft end-play exceeds specifications, and replace the camshaft and/or cylinder if the following measurements are out of specification:

      Dimension A for camshaft No. 1 journal: 1.2008 - 1.2027 in. (30.500 - 30.548mm)
       
      Dimension B for cylinder head No. 1 journal: 1.1953 - 1.1963 in. (30.360 - 30.385mm)
       

    6.  

  28.  
  29. Inspect camshaft sprocket run out, as follows:
    1. Put a V-block on precise flat table, and support the No. 2 and No. 5 journals of the camshaft.
      NOTE
      Do not support journal No. 1 (on the side of camshaft sprocket) because it has a different diameter than the other three journals.

    2.  
    3. Measure camshaft sprocket run out with a dial indicator. (Total indicator reading), and replace the camshaft sprocket it the run out measurement exceeds specification.
      NOTE
      Camshaft sprocket run out limit : 0.0059 in. (0.15mm)

    4.  

  30.  
  31. Inspect the valve lifters, as follows:
    1. Check the surface of valve lifter for wear or cracks. If any defects are found, replace the valve lifter.
    2.  

  32.  
  33. Inspect valve lifter clearance, as follows:
    1. Measure the outer diameter of each valve lifter. Valve lifter outer diameter (Intake and exhaust): 1.3372 - 1.3376 in. (33.965 - 33.975mm)
    2.  
    3. Using an inside micrometer, measure the diameter of valve lifter hole of the cylinder head. Valve lifter bore standard (Intake and exhaust): 1.3386 - 1.3392 in. (34.000 - 34.016mm)
    4.  
    5. Calculate the valve lifter clearance by subtracting the valve lifter outer diameter from the valve lifter hole inner diameter. If the result exceeds the standard, referring to each valve lifter outer diameter and valve lifter hole diameter, replace either or both valve lifter and cylinder head.
      NOTE
      Valve lifter clearance standard (Intake and exhaust): 0.0010 - 0.0020 in. (0.025 - 0.51mm)

    6.  

  34.  

To install:

  1. Install valve lifters and adjusting shims if removed. Install them in their original positions.
  2.  
  3. Install the camshafts. Follow your identification marks made during removal, or follow the identification marks that are present on new camshafts for proper placement and direction. Install the camshafts so that the dowel pins on the front end faces are positioned as shown (No. 1 cylinder TDC on its compression stroke).
  4.  
  5. Install the camshaft brackets. Remove all foreign material completely from the camshaft bracket backsides and from the cylinder head installation faces. Install by referring to the installation location mark on the upper surface and front mark. Install so that the installation location mark can be correctly read when viewed from the side of the left exhaust bank.
  6.  
  7. Apply liquid gask