7-40 POWER UNIT
INSPECTION / SERVICING
NOTE:
If cracks, excessive wear or other damage is found on any com-
ponent, replace componet.
CYLINDER
• Cylinder distortion
Using a straightedge and thickness gauge, measure cylinder
distortion (gasketed surface) at a total of six (6) location as
shown.
[ 09900-20803 : Thickness gauge
Cylinder distortion
Service limit : 0.030 mm (0.0012 in.)
If measurement exceeds service limit, resurface or replace
cylinder.
NOTE:
Cylinder can be resurfaced, using a sureface plate and #400
grit wet sand paper.
Use a figure eight sanding pattern when resurfacing.
• Water jackets
Check water jackets.
If clog or obstruction is found, clean water jacket.
• Cylinder bore
Inspect cylinder walls for scratches, roughness, or ridges which
indicate excessive wear.
If cylinder bore is very rough or deeply scratched, or ridges,
rebore cylinder and use oversize piston.
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