48. Cylinder Head Disassemble

^ Tools Required
- J 8062 Valve Spring Compressor





This engine uses a 39 mm (1.53 inch) satellite faced exhaust valve and an intake valve that is 46 mm (1.81 inch). Intake and exhaust valves with oversize stems are available in 0.09 mm (0.03 inch) and 0.39 mm (0.153 inch) oversize.

1. Remove the valve keys using the following procedure:
1.1. Compress the valve springs with the J 8062.
1.2. Remove the valve keys.
1.3. Remove the J 8062.
2. Remove the following components:
^ The caps from the intake valves
^ The rotators from the exhaust valves
^ The shields
^ The O-rings
^ The valve springs with the dampers and the shims
3. Remove the exhaust valve seals.
4. Remove the valves.
5. Place the valves in a rack and return the valves to the original positions during assembly.





6. Drive out the prechambers with a small nylon or brass drift inserted through the injection nozzle hole. The prechambers use high temperature super alloy materials. Replace the prechambers with the correct part number for this series of engine.