Valve Clearance: Adjustments

ADJUSTING
Adjust valve clearance while engine is cold.
1. Turn crankshaft. Position cam lobe upward on camshaft for valve that must be adjusted.





2. Place Tool (1) around camshaft as shown in figure.
Before placing Tool (1), 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 (1).





3. Rotate Tool (1) so that valve lifter is pushed down.





4. Place Tool (2) between camshaft and valve lifter to retain valve lifter.

CAUTION:
^ Tool (2) must be placed as close to camshaft bracket as possible.
^ Be careful not to damage cam surface with Tool (2).

5. Remove Tool (1).





6. Remove adjusting shim using a small screwdriver and a magnetic finger.
7. Determine replacement adjusting shim size using the following formula.





^ Use a micrometer to 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 - 0.37 mm (0.0146 inch)]
Exhaust: N = R + [M - 0.40 mm (0.0157 inch)]

Shims are available in 50 sizes from 2.00 mm (0.0787 inch) to 2.98 mm (0.1173 inch), in steps of 0.02 mm (0.0008 inch).





^ Select the closest size shim to the calculated thickness. Refer to chart under Valve Shim; Application and ID.





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





9. Place Tool (1) as explained in steps 2 and 3.
10. Remove Tool (2).
11. Remove Tool (1).
12. Recheck valve clearance.





Valve clearance
Whenever valve clearances are adjusted to cold specifications, check that the clearances satisfy hot specifications and adjust again if necessary.