ENG
INSPECTION AND REPAIR
5-23
2. Clean the valve surfaces of the carbon
deposits.
3. Inspect:
•
Valve seal surface
Pitting/Wear ➔ Grind the valve seal sur-
face.
4. Measure:
•
Edge thickness (a)
Out of specification ➔ Replace valve.
Edge thickness (a):
Intake: 1.0 ~ 1.4 mm
<Limit>: 0.8 mm
Exhaust: 0.8 ~ 1.2 mm
<Limit>: 0.65 mm
5. Check:
•
Valve stem tip
Deformed, mushroom-shaped or with a
higher diameter than the rest of the stem
➔ Replace valve.
•
Misalignment:
Out of specification ➔ Replace valve.
Stem offsetting:
<Limit>: 0.01 mm
NOTE:
•
Changing the valve, replace also the valve
guide.
•
Pulling the valve out, replace the stem seal.
VALVE SEAT
1. Clean the valve surface and seat of carbon
deposits.
2. Inspect:
•
Valve seat
Pitting/Wear ➔ Renew valve seat.
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