The valve lash adjustment should be performed only when the engine is hot and running.
- Warm up the engine until it reaches its normal operating temperature.
- Remove the valve covers by withdrawing the securing bolts. Be careful of the hot oil which will splash off the rocker assembly when the cover is removed. It is advisable to use commercially available oil deflector clips on the rocker arms when adjusting the valve lash.
- With the engine idling, insert the proper thickness feeler gauge (refer to the "Tune-Up Specifications" chart) between the valve stem tip and the rocker arm to measure the clearance between them. If necessary, turn the self-locking rocker arm stud nut to obtain the correct valve clearance.
- Repeat step three to adjust each of the other valves.
- After all of the valves have been adjusted, stop the engine, remove the oil deflector clips and replace the valve covers, using new gaskets between the covers and the cylinder heads. If much oil was lost during the valve adjustment procedure, check the oil level in the crankcase.