Infinity_FX35_FX45_2003-2005

Valve Lash

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Adjustment



4.5L Engine


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Fig. Checking valve clearance-4.5L engine



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Fig. When at TDC No. 1 cylinder, the camshaft lobes should point as shown-4.5L engine



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Fig. Valve lash inspection positions at No. 1 TDC and No. 3 TDC-4.5L engine



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Fig. Valve lash inspection positions at No. 6 TDC-4.5L engine



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Fig. Position the camshaft lobe as shown for shim replacement-4.5L engine



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Fig. Use the tools shown to depress the valve spring for shim replacement-4.5L engine



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Fig. The shims are stamped with their thickness-4.5L engine

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  

Perform inspection after removal, installation or replacement of camshaft or valve-related parts, or if there is unusual engine conditions regarding valve clearance.

  1. Warm up the engine. Then turn it OFF.
  2.  
  3. Remove the rocker covers (right and left bank).
  4.  
  5. Set the No. 1 cylinder at TDC of its compression stroke, as follows:
    1. Rotate the crankshaft pulley clockwise to align the TDC identification notch (without the paint mark) with the timing indicator on the front cover.
    2.  
    3. Make sure that both intake and exhaust cam noses of the No. 1 cylinder (engine front side of the left engine bank) are located as shown. If not, turn the crankshaft one revolution (360 degrees) and align as shown.
    4.  

  6.  
  7. Using a feeler gauge, measure the valve clearance for the following cylinders:

    Cylinder 1 Intake valves
     
    Cylinder 1 Exhaust valves
     
    Cylinder 2 Intake valves
     
    Cylinder 4 Intake valves
     
    Cylinder 5 Intake valves
     
    Cylinder 7 Exhaust valves
     
    Cylinder 8 Exhaust valves
     




    1. Valve clearance standard cold (68°F/20°C):

      Intake: 0.010 - 0.013 in. (0.26 - 0.34mm)
       
      Exhaust: 0.011 - 0.015 in. (0.29 - 0.37mm)
       

    2.  
    3. Valve clearance hot (176°F/80°C):
      CAUTION
      If inspection was carried out with cold engine, make sure values with fully warmed up engine are still within specifications. Valve clearance standard:



      Intake: 0.012 - 0.016 in. (0.304 - 0.416mm)
       
      Exhaust: 0.012 - 0.016 in. (0.308 - 0.432mm)
       

    4.  

  8.  
  9. Rotate the crankshaft pulley clockwise (when viewed from engine front) by 270 degrees from the position of No. 1 cylinder compression TDC to align No. 3 cylinder at TDC of its compression stroke.
    NOTE
    The crankshaft pulley mounting bolt flange has an angle mark every 90 degrees. They can be used as a guide to rotation angle.

  10.  
  11. Using a feeler gauge, measure the valve clearance for the following cylinders:

    Cylinder 3 Intake valves
     
    Cylinder 3 Exhaust valves
     
    Cylinder 4 Exhaust valves
     
    Cylinder 5 Exhaust valves
     
    Cylinder 7 Intake valves
     
    Cylinder 8 Intake valves
     




    1. Valve clearance standard cold (68°F/20°C):

      Intake: 0.010 - 0.013 in. (0.26 - 0.34mm)
       
      Exhaust: 0.011 - 0.015 in. (0.29 - 0.37mm)
       

    2.  
    3. Valve clearance hot (176°F/80°C):

      Intake: 0.012 - 0.016 in. (0.304 - 0.416mm)
       
      Exhaust: 0.012 - 0.016 in. (0.308 - 0.432mm)
       

    4.  

  12.  
  13. Rotate the crankshaft pulley clockwise (when viewed from engine front) by 90 degrees from the position of No. 3 cylinder compression TDC to align No. 6 cylinder at TDC of its compression stroke.
  14.  
  15. Using a feeler gauge, measure the valve clearance for the following cylinders:

    Cylinder 2 Exhaust valves
     
    Cylinder 6 Exhaust valves
     
    Cylinder 6 Intake valves
     




    1. Valve clearance standard cold (68°F/20°C):

      Intake: 0.010 - 0.013 in. (0.26 - 0.34mm)
       
      Exhaust: 0.011 - 0.015 in. (0.29 - 0.37mm)
       

    2.  
    3. Valve clearance hot (176°F/80°C):

      Intake: 0.012 - 0.016 in. (0.304 - 0.416mm)
       
      Exhaust: 0.012 - 0.016 in. (0.308 - 0.432mm)
       

    4.  

  16.  
  17. For any valves that measure out of the standard allowable range, perform the following adjustment steps.
    NOTE
    Adjust valve clearance while the engine is cold. After adjustment, make sure that the valve clearance is within the standard range while the engine is hot.

  18.  
  19. Thoroughly wipe off all engine oil around the adjusting shim.
  20.  
  21. Rotate the crankshaft to position the cam nose upward for the camshaft for the valve that must be adjusted.
  22.  
  23. Using small screwdriver or pick, turn the round hole of adjusting shim in the direction of the arrow (toward the center of the cylinder head).
  24.  
  25. For all valves except the exhaust side of No. 7 and No. 8 cylinders, install the lifter stopper SST: 10115120 (J38972-2) or equivalent, as follows:
    1. Place the camshaft pliers around camshaft as shown in the figure.
    2.  
    3. Rotate the camshaft pliers so that the valve lifter is pushed down.
      CAUTION
      Be careful not to damage the cam surface, valve lifter or cylinder head with the camshaft pliers.

    4.  
    5. Place the lifter stopper between the camshaft and the edge of the valve lifter to retain the valve lifter.
      CAUTION
      The lifter stopper must be placed as close to the camshaft bracket as possible. Be careful not to damage the cam surface, valve lifter or cylinder head with the lifter stopper.

    6.  
    7. Remove camshaft pliers.
      CAUTION
      The camshaft pliers should be removed by rotating it slowly because the lifter stopper hits and damages the journal portion when rotating the camshaft pliers quickly.

    8.  

  26.  
  27. For the exhaust side of No. 7 and No. 8 cylinders, perform the following:
    NOTE
    Exhaust side of No. 7 and No. 8 cylinders do not have space for installing with camshaft pliers SST: KV10115110 (J38972-1). Install lifter stopper SST: KV10115120 (J38972-2)] or equivalent according to the following instructions:

    1. Rotate the crankshaft to press the cam nose onto the adjusting part of the valve lifter.
    2.  
    3. Place the lifter stopper between the camshaft and the edge of the valve lifter to retain the valve lifter.
      CAUTION
      The lifter stopper must be placed as close to the camshaft bracket as possible. Be careful not to damage the cam surface, valve lifter or cylinder head with the lifter stopper.

    4.  
    5. Rotate the crankshaft slowly 180 degrees clockwise.
      CAUTION
      Rotate the crankshaft slowly because the lifter stopper hits and damages the journal portion by rotating the crankshaft quickly.

    6.  

  28.  
  29. Blow air into the round hole to separate the adjusting shim from the valve lifter.
    WARNING
    When blowing, use goggles to protect your eye.

  30.  
  31. Remove the adjusting shim with a magnetic tool.
  32.  
  33. Use the following to calculate the adjusting shim thickness for replacement:
    1. Use a micrometer to determine the thickness of the removed shim measured at the center.
    2.  
    3. Calculate the thickness of the new adjusting shim so that valve clearance falls within the specified acceptable range.
    4.  

  34.  

Valve lifter thickness calculation: t = t1 + (C1 - C2 )

t = Valve lifter thickness to be replaced

t1 = Removed valve lifter thickness

C1 = Measured valve clearance

C2 = Standard valve clearance (Intake: 0.012 in./0.30mm, Exhaust: 0.013 in./0.33mm@68 degrees F/20 degrees C)


NOTE
Shims are available in 64 sizes from 0.0913 - 0.1161 in. (2.32 - 2.95mm) in steps of 0.0004 in. (0.01mm). And the thickness of new adjusting shims can be identified by stamp marks on the underside (inside the cylinder).

  1. Install the new adjusting shim using a suitable tool, with the surface on which the thickness is stamped facing down.
  2.  
  3. For all valve lifters except exhaust side of No. 7 and No. 8 cylinder, remove the lifter stopper as follows:
    1. Perform the same procedure as described for removal using the camshaft pliers.
    2.  
    3. Remove the lifter stopper.
    4.  
    5. Remove the camshaft pliers.
    6.  

  4.  
  5. For exhaust side of No. 7 and No. 8 cylinder valve lifters, rotate the crankshaft slowly 180 degrees clockwise, then remove the lifter stopper.
  6.  
  7. Manually rotate the crankshaft pulley a few turns.
  8.  
  9. Make sure that the valve clearance is within specifications for cold and hot settings.
    NOTE
    Valve clearance specifications:



    Cold Intake (68 degrees F/20 degrees C): 0.010 - 0.013 in. (0.26 - 0.34mm)
     
    Cold Exhaust: 0.011 - 0.015 in. (0.29 - 0.37mm)
     
    Hot Intake (176 degrees F/80 degrees C): 0.012 - 0.016 in. (0.304 - 0.416mm)
     
    Hot Exhaust: 0.012 - 0.016 in. (0.308 - 0.432mm)
     

  10.  

3.5L Engine


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Fig. Engine cylinder number identification-3.5L engine



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Fig. Position the crankshaft at TDC No. 1-3.5L engine



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Fig. When at TDC No. 1 cylinder, the camshaft lobes should point as shown-3.5L engine



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Fig. Measure the valve lash with the camshaft lobe positioned as shown-3.5L engine



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Fig. Measure the valve lash for the valves shown with the engine at No. 1 cylinder TDC-3.5L engine



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Fig. Measure the valve lash for the valves shown with the engine at No. 3 cylinder TDC-3.5L engine



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Fig. Measure the valve lash for the valves shown with the engine at No. 5 cylinder TDC-3.5L engine



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Fig. Measure the valve lifter height as shown-3.5L engine



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Fig. Valve lifter identification stamp location-3.5L engine

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  

Perform inspection after removal, installation or replacement of camshaft or valve-related parts, or if there is unusual engine condition regarding valve clearance.

  1. Remove the right and left rocker covers.
  2.  
  3. Set the No. 1 cylinder at TDC of its compression stroke, as follows:
    1. Rotate the crankshaft pulley clockwise until the timing mark (grooved line without color) is aligned with the timing indicator.
    2.  
    3. Make sure the No. 1 cylinder intake and exhaust cam noses are facing inward and upward from the cylinder head, as shown. If they are not positioned as shown, rotate the crankshaft pulley 360 degrees clockwise (when viewed from the front).
    4.  

  4.  
  5. Using a feeler gauge, measure the valve clearance for the following cylinders: Cylinder 1 Intake, Cylinder 2 Exhaust, Cylinder 3 Exhaust, Cylinder 6 Intake valves
    1. Valve clearance cold (68°F/20°C):

      Intake: 0.010 - 0.013 in. (0.26 - 0.34mm)
       
      Exhaust: 0.011 - 0.015 in. (0.29 - 0.37mm)
       

    2.  
    3. Valve clearance hot (176°F/80°C):

      Intake: 0.012 - 0.016 in. (0.304 - 0.416mm)
       
      Exhaust: 0.012 - 0.016 in. (0.308 - 0.432mm)
       

    4.  

  6.  
  7. Rotate the crankshaft by 240 degrees clockwise (when viewed from front) to align the No. 3 cylinder at TDC of its compression stroke.
    NOTE
    Crankshaft pulley mounting bolt flange has a stamped line every 60 degrees. They can be used as a guide to rotation angle.

  8.  
  9. Using a feeler gauge, measure the valve clearance for the following cylinders: Cylinder 2 Intake valves, Cylinder 3 Intake valves, Cylinder 4 Exhaust valves, Cylinder 5 Exhaust valves.


    1. Valve clearance standard cold (68°F/20°C):

      Intake: 0.010 - 0.013 in. (0.26 - 0.34mm)
       
      Exhaust: 0.011 - 0.015 in. (0.29 - 0.37mm)
       

    2.  
    3. Valve clearance hot (176°F/80°C):

      Intake: 0.012 - 0.016 in. (0.304 - 0.416mm)
       
      Exhaust: 0.012 - 0.016 in. (0.308 - 0.432mm)
       

    4.  

  10.  
  11. Rotate the crankshaft by 240 degrees clockwise (when viewed from front) to align the No. 5 cylinder at TDC of its compression stroke.
    NOTE
    Crankshaft pulley mounting bolt flange has a stamped line every 60 degrees. They can be used as a guide to rotation angle.

  12.  
  13. Using a feeler gauge, measure the valve clearance for the following cylinders: Cylinder 1 Exhaust valves, Cylinder 4 Intake valves, Cylinder 5 Intake valves, Cylinder 6 Exhaust valves.


    1. Valve clearance standard cold (68°F/20°C):

      Intake: 0.010 - 0.013 in. (0.26 - 0.34mm)
       
      Exhaust: 0.011 - 0.015 in. (0.29 - 0.37mm)
       

    2.  
    3. Valve clearance hot (176°F/80°C):
      CAUTION
      If the inspection was carried out with cold engine, make sure values with fully warmed up engine are still within specifications.



      Intake: 0.012 - 0.016 in. (0.304 - 0.416mm)
       
      Exhaust: 0.012 - 0.016 in. (0.308 - 0.432mm)
       

    4.  

  14.  
  15. For all valve lifters that are found to be outside the specified range, perform the following steps.
  16.  

Perform adjustment depending on selected head thickness of valve lifter.

The specified valve lifter thickness is the dimension at normal temperatures. Ignore dimensional differences caused by temperature. Use the specifications for hot engine condition to adjust.

  1. Remove the camshaft.
  2.  
  3. Remove the valve lifters at the locations that are outside the standard.
  4.  
  5. Measure the center thickness of the removed valve lifters with a micrometer.
  6.  
  7. Use the following equation to calculate valve lifter thickness for the replacement lifters.
    NOTE
    Valve lifter thickness calculation: thickness of replacement valve lifter = t1 + (C1 - C2). t1 = Thickness of removed valve lifter, C1 = measured valve clearance, C2 = standard valve clearance.

  8.  

The thickness of a new valve lifter can be identified by stamp marks on the reverse side (inside the cylinder). Stamp mark 788U or 788R indicates 7.88 mm (0.3102 in) in thickness.


NOTE
Two types of stamp marks are used for parallel setting and for manufacturer identification. Available thicknesses of valve lifters include 27 sizes covering a range of 0.3102 - 0.3307 in. (7.88 - 8.40mm) in steps of 0.0008 in. (0.02mm).

  1. Install the selected valve lifter(s).
  2.  
  3. Install the camshaft.
  4.  
  5. Manually turn crankshaft pulley a few turns.
  6.  
  7. Make sure the valve clearances for the cold engine are within specifications by referring to the specified values.
  8.  
  9. After completing the repair, check valve clearances again with the specifications for a warmed engine. Make sure the values are within specifications.
    NOTE
    Valve clearance specifications:



    Cold Intake (68 degrees F/20 degrees C): 0.010 - 0.013 in. (0.26 - 0.34mm)
     
    Cold Exhaust: 0.011 - 0.015 in. (0.29 - 0.37mm)
     
    Hot Intake (176 degrees F/80 degrees C): 0.012 - 0.016 in. (0.304 - 0.416mm)
     
    Hot Exhaust: 0.012 - 0.016 in. (0.308 - 0.432mm)
     

  10.  

 
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