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Home >> Infiniti >> 2003 >> I35 >> Repair and Diagnosis >> Engine Performance >> Engine Controls - On-Vehicle Adjustments >> Engine Mechanical >> Valve Clearance Adjustment >> M45
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Valve Clearance Adjustment: M45

  1. Turn crankshaft to position cam lobe on camshaft of valve that must be adjusted upward. Thoroughly wipe off engine oil around adjusting shim using a rag. See Fig 1.
  2. Using a extra-fine screwdriver, turn the round hole of the adjusting shim in the direction of the arrow.
    3. NOTE: Before placing Camshaft Pliers (J38972-1) (A), rotate cam lobe toward center of cylinder head (1) to simplify shim removal later.
  3. Place Camshaft Pliers (J38972-1) (A) around camshaft. See figure Fig 2.
    4. NOTE: Be careful to NOT damage cam surface with camshaft pliers.
    NOTE: Lifter Stopper Tool (J38972-2) (B) must be placed as close to camshaft bracket as possible.
  4. Rotate camshaft pliers so that valve lifter is pushed down. Place Lifter Stopper Tool (J38972-2) (B) between camshaft and the edge of the valve lifter to retain valve lifter. See Fig 3.
    5. NOTE: Wear proper eye protection for following procedure.
  5. Remove camshaft pliers. Blow air into the hole to separate adjusting shim from valve lifter.
  6. Remove adjusting shim using a small screwdriver and a magnetic finger. See Fig 4.
  7. To determine replacement shim size, measure thickness of removed shim at center of shim with a micrometer. Calculate thickness of new shim so valve clearance is within specifications.
  8. Use the following formula to determine replacement shim size:
    • R = Thickness of removed shim.
    • N = Thickness of new shim.
    • M = Measured valve clearance.
    • Intake: N = R + [M -.0118 in. (.300 mm)]
    • Exhaust: N = R + [M -.0130 in. (.330 mm)]
  9. Shims are available in 64 sizes from 0.0913 in. (2.32 mm) to 0.1161 in. (2.95 mm) in steps of 0.0004 in. (0.01 mm).
  10. Select new shim with thickness as close as possible to calculated value.
  11. Using a suitable tool, install new shim with side on which thickness is stamped facing down. Rotate camshaft pliers again to remove lifter stopper.
  12. Recheck valve clearance (cold value). Warm engine and check valve clearance again (hot value). See VALVE CLEARANCE SPECIFICATIONS .
    Fig 1: Correct Cam Lobe Positioning (M45)
    G00220052Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 2: Identifying Correct Camshaft Pliers Placement (M45)
    G00220053Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 3: Rotating Camshaft While Applying Valve Lifter Stopper (M45)
    G00220054Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 4: Removing Adjusting Shim (M45)
    G00220055Courtesy of NISSAN MOTOR CO., U.S.A.
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