Off Vehicle Service

VALVE SPRINGS & SEALS

REMOVAL - CYLINDER HEAD OFF
1. Using Special Tool C-3422-D (valve spring compressor) with Adapter 6526 compress valve spring and remove valve retaining locks. For Special Tool identification, (Refer to - ENGINE - SPECIAL TOOLS).
2. Slowly release valve spring compressor. Remove valve spring retainer and valve spring.
3. Remove valve stem seal assembly.

INSTALLATION - CYLINDER HEAD OFF
1. Coat valve stems with clean engine oil and insert in cylinder head.
2. Install new valve stem seals.

CAUTION: If oversize valves are used, there is only one oversize valve available. The same stem seal is used on both the standard and oversize valve.

NOTE: On the high output R/T engine, the valve spring MUST be oriented properly when installed.





The closely spaced spring coils should be positioned toward the cylinder head (spring seat) (Fig. 41).





3. Position valve spring and retainer on spring seat (Fig. 40) or (Fig. 41).
4. Compress valve springs only enough to install locks, taking care not to misalign the direction of compression. Nicked valve stems may result from misalignment of the valve spring compressor.

CAUTION: When depressing the valve spring retainers with valve spring compressor the locks can become dislocated. Check to make sure both locks are in their correct location after removing tool.





5. Check the valve spring installed height after refacing the valve and seat (measurement B) (Fig. 39). Make sure measurements are taken from top of spring seat to the bottom surface of spring retainer. If height is greater than 40.18 mm (1.58 inch), install a 0.762 mm (0.030 inch) spacer under the valve spring seat to bring spring height back within specification.
6. Install rocker arms and shafts.
7. Checking dry lash. Dry lash is the amount of clearance that exists between the base circle of an installed cam and the rocker arm roller when the adjuster is drained of oil and completely collapsed. Specified dry lash is 1.00 mm (0.039 inch) for intake and 1.40 mm (0.055 inch) for exhaust. After performing dry lash check, refill adjuster with oil and allow 10 minutes for adjuster(s) to bleed down before rotating cam.