5-23
POWR
E
CYLINDER HEAD, THERMOSTAT AND EXHAUST
COVER
SERVICE POINTS
Cylinder head inspection
1. Inspect:
● Water jacket
Material deposit/Corrosion → Clean.
● Cylinder inner surface
Score marks → Clean.
Use #600 ~ 800 grit wet sandpaper.
CAUTION:
Do not scratch the fitting surfaces of the
cylinder and cylinder cover.
2. Measure:
● Cylinder head warpage
Use a straightedge and thickness
gauge.
Out of specification → Resurface or
replace.
Warpage limit:
0.1 mm (0.004 in)
Resurfacing steps:
● Place a 400 ~ 600 grit wet sandpaper
on the surface plate.
● Resurface the head using a figure-
eight sanding pattern.
NOTE:
Rotate the head several times to avoid
removing too much material from one
side.
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