Valve Clearance: Adjustments

ADJUSTMENT

CAUTION: Adjustment of valve clearance should be performed while engine is cold.





1. Measure all valve clearances.

NOTE: Record each valve clearance after it has been measured.

2. Remove the shim from valve lifter.





1. Prepare the ST.
ST 498187200 SHIM REPLACER





2. Rotate the notch of the valve lifter outward by 45°.





3. Adjust the SHIM REPLACER notch to valve lifter and set it.

NOTE: When setting, be careful the SHIM REPLACER edge does not touch shim.





4. Tighten bolt (A) and install it to the cylinder head.
5. Tighten bolt (B) and insert the valve lifter.





6. Insert tweezers into the notch of the valve lifter, and take the shim out.





NOTE: By using a magnet (A), the shim (B) can be taken out without dropping it.





3. Measure the thickness of shim with a micrometer.





Selection formula





Shim table

4. Select a shim of suitable thickness using measured valve clearance and shim thickness, by referring to the table shown.
5. Set the suitable shim selected in step 4 to valve lifter.
6. Inspect all valves for clearance again at this stage. If the valve clearance is not correct, repeat the procedure over again from the first step.
7. After inspection, install the related parts in the reverse order of removal.