If the cylinder head is removed from the engine, refer to the Valves, Removal & Installation procedures in this section and remove the valve springs.
REMOVAL & INSTALLATION
See Figures 1, 2 and 3
- Refer to the Rocker Arm, Removal & Installation procedures in this section and remove the rocker arm assembly.
- Using an old set of rocker arm shafts, install them in place of the rocker arm assembly; this will prevent bending or scratching the original set of shafts.
- Remove the spark plug(s) from the cylinder head.
- Rotate the crankshaft to position the cylinder (being worked on) to the TDC of its compression stroke.
- Using a Spark Plug Air Hold tool, install it into the spark plug hole and inject compressed air into the cylinder to hold the valves in place.
Be advised that if air pressure in the cylinder is lost while the valve keepers are removed, the valve will fall into the cylinder. It will then be necessary to remove the cylinder head to extract the valve.
- Using the Spring Compressor tool, compress the spring(s) and remove the valve keepers. Relax the spring compressor tool, then, remove the valve retainer, the spring(s) and the valve seal; keep the parts in the order for reinstallation purposes. Work on one valve at a time.
If reusing the valve seals, it is recommended to replace the neck springs of the seal; the black spring is used on the exhaust valve seal and the white spring is used on the intake valve seal. The seals are not interchangeable between the intake and the exhaust valves.
- Inspect the springs for fatigue, cracks and/or uniformity; if necessary, replace them. Using a putty knife, clean the gasket mounting surfaces.
- To assemble, use new seals (if necessary) and reverse the disassembly procedures. Using a plastic mallet, tap the valve a few times to make sure the valve keepers are seated correctly.
When installing the springs, be sure to position the closely wound coils ends or painted part toward the cylinder head.
- To install, use new gaskets, seals and reverse the removal procedures. Start the engine and check for leaks.
See Figure 4
- Position the valve spring on a flat, clean surface next to a square.
- Rotate the spring against the square to measure the distortion (out-of-roundness). If the spring height varies (between similar springs) by more than 1 / 16 , replace the spring.