REMOVAL & INSTALLATION
See Figures 1 and 2
- Block the head on its side, or install a pair of head-holding brackets made especially for valve removal.
- Use a socket slightly larger than the valve stem and keepers, place the socket over the valve stem and gently hit the socket with a plastic hammer to break loose any varnish buildup.
- Remove the valve keepers, retainer, spring shield and valve spring using a valve spring compressor (the locking C-clamp type is the easiest kind to use).
- Put the parts in a separate container numbered for the cylinder being worked on; do not mix them with other parts removed.
- Remove and discard the valve stem oil seals. A new seal will be used at assembly time.
- Install the valves in the cylinder head and metal caps, if applicable.
- Install new valve stem oil seals.
- Install the valve keepers, retainer, spring shield and valve spring using a valve spring compressor (the locking C-clamp type is the easiest kind to use).
- Check the valve spring installed height, shim or replace as necessary.
See Figures 3, 4 and 5
Place the valve spring on a flat surface next to a carpenter's square. Measure the height of the spring, and rotate the spring against the edge of the square to measure distortion. If the spring height varies (by comparison) by more than 1 / 16 in. (1.6mm) or if the distortion exceeds 1 / 16 in. (1.6mm), replace the spring. Have the valve springs tested for spring pressure at the installed and compressed (installed height minus valve lift) height using a valve spring tester. Springs should be within one pound, plus or minus each other. Replace as necessary.
VALVE SPRING INSTALLED HEIGHT
See Figure 6
After installing the valve spring, measure the distance between the spring mounting pad and the lower edge of the spring retainer. Compare the measurement to specifications. If the installed height is incorrect, add shim washers between the spring mounting pad and the spring. Use only washers designed for valve springs, available at most auto parts stores.