wsm M7040 - Page 194

ENGINE
M6040, M7040, WSM
1-S62
Cylinder Head Flaw
1. Prepare an air spray red check.
2. Clean the surface of the cylinder head with the detergent (2).
3. Spray the cylinder head surface with the red permeative liquid
(1). Leave it five to ten minutes after spraying.
4. Wash away the red permeative liquid on the cylinder head
surface with the detergent (2).
5. Spray the cylinder head surface with the white developer (3).
6. If flawed, it can be identified as red marks.
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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.
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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.
IMPORTANT
• When valve lapping is performed, be sure to check the
valve recessing and adjust the valve clearance after
assembling the valve.
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(1) Red Permeative Liquid
(2) Detergent
(3) White Developer
Valve recessing
(Intake and exhaust)
Factory specification
(recessing)
0.65 to 0.85 mm
0.0256 to 0.0335 in.
Allowable limit
(recessing)
1.2 mm
0.0472 in.
(1) Cylinder Head Surface (A) Recessing
(B) Protrusion
(1) Correct
(2) Incorrect
(3) Incorrect
KiSC issued 07, 2012 A