See Figures 1 through 6
- Start the engine and run it until it reaches normal operating temperature.
- Stop the engine. Remove the air cleaner assembly. Remove the valve cover.
- Turn the crankshaft until the pointer or notch on the pulley aligns with the 0 or the T mark on the timing scale. This will ensure that the engine is at TDC. Turning the engine (with a wrench on the crankshaft bolt) is much easier if the spark plugs are removed.
Check that the rocker arms on the No. 1 cylinder are loose and those on the No. 4-cylinder are tight. If not, turn the crankshaft one complete revolution (360 degrees).
- Using a feeler gauge, check the clearance between the bottom of the rocker arm and the top of the valve stem. This measurement should correspond to the one given in the Tune-Up Specifications Chart in this section. Check only the first set of valves shown in the accompanying illustrations for your engine.
- If the clearance is not within specifications, the valves will require adjustment. Loosen the locknut on the rocker arm and, still holding the nut with an open end wrench, turn the adjustment screw to achieve the correct clearance. This is a detail oriented job; work for exact clearance.
- Once the correct clearance is achieved, keep the adjustment screw from turning with your screwdriver and then tighten the locknut. Recheck the valve clearance.
- After the correct set of valves have been adjusted, turn the engine one complete revolution (360 degrees) and adjust the second set of valves shown in the illustration.
- Use a new gasket and then install the valve cover. Install any other components which were removed for access to the cover.
- Start the engine. Listen for any excessive tapping (indicating a loosened rocker) and check the valve cover for any signs of oil leaks.