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Head unit: valves - rocker arms
Note
Valve guide and valve must always be replaced as a set. Intake valves use cast-iron guides. Exhaust valves use
bronze guides.
Checking valve - valve seat clearance
Use Prussian blue or a mixture of minium and oil to measure the contact surface (W) between valve and seat. Correct
size is
1.0-1.5
mm.
Maximum limit:
2.0
mm.
Grind seat if outside the above limit.
Fill the intake and exhaust ducts with fuel to check for leaks. In the event of leakage, check the sealing surfaces for
burrs.
Checking valve-valve guide clearance
Assembly clearance:
0.03-0.06
mm
Service limit:
0.08
mm.
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