Valve: Service and Repair

Removing and Installing or Replacing All Valves
(Cylinder Head Removed)

Preliminary tasks are described in Disassembling and assembling cylinder head, refer to Cylinder Head Assembly, Service and Repair.
Replace valve stem seals, refer to Valve Guide Seal, Service and Repair.
Remove valves from cylinder head.
If necessary, check valve guide for wear, refer to Valve Guide, Testing and Inspection.
If necessary, remachine valve seat, refer to Valve Seat, Service and Repair.





Caution:
Incorrect installation possible.
Incorrect installation will result in valve spring breakage.

The valve spring coils are narrower at the lower ends.
The color coding (3) is normally located at the lower end of the valve springs.
Only the position of the narrower coil is the decisive factor in correct installation of the valve springs (1 and 2).
Install valve springs (1 and 2) in such a way that lower coil points to spring plate at bottom.





Arrangement:
1. Valve
2. Lower plate spring
3. Valve-stem seal
4. Outer spring
5. Inner spring
6. Top spring plate
7. Valve tapers