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Servicing Your Honda 57
Valve Clearance
1. Clean the valve shim contact area in the valve
lifter (1) with compressed air.
2. Measure the shim thickness with a micrometer
and record it.
Sixty-nine different thickness shims (2) are
available from the thinnest (1.200 mm thickness)
shim to the thickest (2.900 mm thickness) in
intervals of 0.025 mm.
3. Calculate the new shim thickness using th
e
equation below.
A = (B – C) + D
A: New shim thickness
B: Recorded valve clearance
C: Specified valve clearance
D: Old shim thickness
• Make sure of the correct shim thickne
ss by
measuring the shim with a micrometer.
• Reface the intake valve seat if carbon deposits
result in a calculated dimension of over
2.450 mm.
Reface the exhaust valve seat if carbon deposits
result in a calculated dimension of over
2.900 mm.
Shim Selection
(1) valve lifter
(2) shim
(1)
(2)
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