Valve: Testing and Inspection

CHECKING
- Inspect visually for scoring on valve stem and valve seat surfaces.
- If clear signs of wear are present replace valves.

REFACING INTAKE VALVE





45°
a - max 3.5 mm (0.138 in.)
b - min. 0.5 mm (0.020 in.)

REFACING EXHAUST VALVES

NOTE
- Valves must not be refaced by cutting or grinding.
- Only lapping is permitted.

SCRAPING EXHAUST VALVES

WARNING!
^ Worn sodium-filled exhaust valves must not be scrapped without properly disposing of the sodium.
^ The valves must be cut into two parts with a hacksaw between the center of the valve stem and the valve head. They must not come into contact with water when being cut open.
^ After cutting the valves:
- Throw the valves, not more than ten at a time, into a bucket filled with water and STAND BACK.
- A sudden chemical reaction occurs as the sodium comes into contact with the water.
^ Valves that have been processed in this way can then be disposed of in the normal waste.