Disassembly and Assembly

CAUTION:
Overhaul/Replacement
If any part of the valve tappet (6500) needs replacing, replace the ENTIRE valve tappet. Internal tolerances for the valve tappets are very critical. Mixing components from different valve tappets may upset these tolerances, resulting in improper valve tappet operation and possible engine damage. Keep the valve tappets intact until they are to be cleaned. Valve tappets should always be tested after assembly.

Reinstallation
Keep valve tappets in proper sequence so that they can be installed in their original position. Inspect and test each valve tappet to avoid a mix-up. If a valve tappet is worn, replace all valve tappets and camshaft.

DISASSEMBLY

NOTE: Disassemble and assemble each valve tappet separately. Identify the valve tappets so they can be installed in their original bores.

1. Grasp the lock ring with needle nose pliers to release it from the groove. It may be necessary to depress the plunger to fully release lock ring.
2. Remove the push rod cup, metering valve (disc), plunger and spring.
3. Remove the plunger, the check valve and the check valve retainer and plunger spring. Carefully remove the plunger spring, the check valve retainer and the check valve disc from the plunger.
4. Clean all components.

ASSEMBLY
1. Place the plunger upside down on a clean work bench.
2. Place the check valve (disc or ball check) in position over the oil hole on the bottom of the plunger. Set the check valve spring on top of the check valve (disc or ball check).
3. Position the check valve retainer over the check valve and spring and push the retainer down into place on the plunger.
4. Place the plunger spring and then the plunger (open end up) into the valve tappet body.
5. Position the metering valve (disc) in the plunger and then place the push rod cup in the plunger.
6. Depress the plunger and position the closed end of the lock ring in the groove of the valve tappet body. With the plunger still depressed, position the open ends of the lock ring in the groove. Release the plunger and then depress it again to fully seat the lock ring.