Valve Seat Inspectionrefacing

Clean the intake and exhaust valves thoroughly to remove any carbon deposits.

Apply a light coat of Prussian Blue to the valve seats. Tap the valves and seats using a rubber hose or another hand-lapping tool.

VALVE GUIDE DRIVER

VALVE GUIDE DRIVER

VALVE GUIDE DRIVER

VALVE GUIDE REAMER

VALVE GUIDE REAMER

HAND-LAPPING TOOL

Remove the valve and inspect the valve seat face. The valve seat contact should he within the specified width and even all around the circumference.

STANDARD: 0.90 -1.10 mm (0.035 - 0.043 in) SERVICE LIMIT: 1.5 mm (0.06 in)

If the seat width is not within specification, reface the valve seat (page 8-18).

SEAT WIDTH

Inspect the valve seat face for:

- Replace the valve and reface the valve seat.

- Replace the valve and reface the valve seat.

DAMAGED TACE

UNEVEN SEAT WIDTH

The valves can cor be ground. If a va ¡ve face is burned or badly worn or if it contacts the seat unevenly, replace the valve.

Contact area (too low or loo high) Reface the valve seat.

TOO LOW

TOO LOW

TOO HIGH

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