Piston,Piston Pin And Piston Ring Inspection - Yamaha EF1000 Service Manual

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PISTON, CAMSHAFT, CRANKCASE, CRANKSHAFT
ENG
B
3-15
3. Inspect:
•Crankcase
Damage--+Replace.
•Bearing
Roughness--+Replace bearing.
PISTON, PISTON PIN AND PISTON RING
INSPECTION
1. Measure:
•Piston skirt diameter "P"
@=10 mm (0.4 in) from the piston bottom edge.
Piston size P:
Standard: 50.0 mm (1.969 in)
Limit: 49.93 mm (1.966 in)
2. Measure:
•Piston clearance
Piston clearance=
Cylinder inside diameter " D " -
Piston skirt diameter " P "
Out of specification--+Rebore cylinder
and replace piston and piston rings.
Piston clearance:
0.020-0.035 mm
(0.0008-0.0014 in)
3. Measure:
•Piston pin diameter®
Use a micrometer.
Out of specification--+Replace.
Standard piston pin diameter:
12.0 mm (0.47 in)
Piston pin wear limit:
11.9 mm (0.468 in)
(