Infinity_QX4_1998-2003

Valve Lash

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Adjustment



3.3L Engine

These engines are equipped with hydraulic valve lifters that do not require periodic adjustment.

3.5L Engine

NOTE
Adjust valve clearance while engine is cold.

  1. Turn crankshaft, to position cam lobe on camshaft of valve that must be adjusted upward.
  2.  
  3. Thoroughly wipe off engine oil around adjusting shim using a rag.
  4.  
  5. Using an extra-fine screwdriver, turn the round hole of the adjusting shim in the direction of the arrow.
  6.  
  7. Place Tool (A) around camshaft as shown in figure. Before placing Tool (A), rotate notch toward center of cylinder head (See figure.), to simplify shim removal later.
    CAUTION
    Be careful not to damage cam surface with Tool (A).

  8.  
  9. Rotate Tool (A) (See figure.) so that valve lifter is pushed down.
  10.  
  11. Place Tool (B) between camshaft and the edge of the valve lifter to retain valve lifter.
    CAUTION
    Tool (B) must be placed as close to camshaft bracket as possible. Be careful not to damage cam surface with Tool (B).

  12.  
  13. Remove the Tool (A).
  14.  
  15. Blow air into the hole to separate adjusting shim from valve lifter.
  16.  
  17. Remove the adjusting shim using a small screwdriver and a magnetic finger.
  18.  
  19. Determine replacement adjusting shim size following formula. Using a micrometer determine thickness of removed shim. Calculate thickness of new adjusting shim so valve clearance comes within specified values.

    R = Thickness of removed shim
     
    N = Thickness of new shim
     
    M = Measured valve clearance
     
    Intake: N = R + [M - 0.30 mm (0.0118 in)]
     
    Exhaust: N = R + [M - 0.33 mm (0.0130 in)]
     

  20.  

Shims are available in 64 sizes from 2.32 mm (0.0913 in) to 2.95 mm (0.1161 in), in steps of 0.01 mm (0.0004 in). Select new shim with thickness as close as possible to calculated value.

  1. Install new shim using a suitable tool. Install with the surface on which the thickness is stamped facing down.
  2.  
  3. Place Tool (A) as mentioned in steps 2 and 3.
  4.  
  5. Remove the Tool (B).
  6.  
  7. Remove the Tool (A).
  8.  
  9. Recheck valve clearance.
  10.  

Valve clearance (Cold)



Intake: 0.010 - 0.013
 
Exhaust: 0.011 - 0.015
 

 
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