S-58
V3300-E2B, V3300-T-E2B, WSM
DIESEL ENGINE
Valve Recessing
1. Clean the cylinder head, the valve face and seat.
2. Insert the valve into the valve guide.
3. Measure the valve recessing with a depth gauge.
4. If the measurement exceeds the allowable limit, replace the
valve.
If it still exceeds the allowable limit after replacing the valve,
replace the cylinder head.
W1061543
Valve Lapping
1. Apply compound evenly to the valve lapping surface.
2. Insert the valve into the valve guide. Lap the valve onto its seat
with a valve flapper or screwdriver.
3. After lapping the valve, wash the compound away and apply oil,
then repeat valve lapping with oil.
4. Apply prussian blue to the contact surface to check the seated
rate. If it is less than 70 %, repeat valve lapping again.
• When valve lapping is performed, be sure to check the valve
recessing and adjust the valve clearance after assembling
the valve.
W1061709
Valve recessing
Factory
spec.
Intake
valve
(Protrusion)
0 mm (0 in.) to
(recessing)
0.2 mm (0.0079 in.)
Exhaust
valve
(Protrusion)
0.15 mm (0.0059 in.) to
(recessing)
0.05 mm (0.0019 in.)
Allowable
limit
(recessing)
0.4 mm (0.0157 in.)
(1) Cylinder Head Surface (A) Recessing
(B) Protrusion
(1) Correct
(2) Incorrect
(3) Incorrect
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