Valve Clearance: Adjustments

VALVE ADJUSTMENT
Adjust valve clearance while engine is cold.
1. Turn crankshaft to position cam lobe upward on camshaft of valve being adjusted.





2. Place Tool (A) around camshaft as shown in figure.





3. Rotate Tool (A) so that lifter is pushed down.
Before placing Tool (A), rotate notch toward center of cylinder head (see figure). This will simplify shim removal later.

CAUTION: Be careful not to damage cam surface with Tool (A).





4. Place Tool (B) between camshaft and valve lifter to retain valve lifter.

CAUTION:
- Place Tool (B) as close to camshaft bracket as possible.
- Be careful not to damage cam surface with Tool (B).

5. Remove Tool (A).
6. Rotate adjusting shim until hole is visible. Blow air into the hole to separate adjusting shim from valve lifter.





7. Remove adjusting shim using a small screwdriver and a magnetic finger.
8. Determine replacement adjusting shim size as follows:





a. Using a micrometer, determine thickness of removed shim.
b. 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 - 0.35 mm (0.0138 inch)]
Exhaust: N = R + [M - 0.37 mm (0.0146 inch)]
c. Select new shim with thickness as close as possible to calculated value.







Shims are available in thicknesses from 1.96 mm (0.0772 inch) to 2.68 mm (0.1055 inch), in steps of 0.02 mm (0.0008 inch) .


9. Install new shim using a suitable tool.
Install with the surface on which the thickness is stamped facing down.



10. Place Tool (A) as mentioned in steps 2 and 3.
11. Remove Tool (B).
12. Remove Tool (A).
13. Recheck valve clearance.