Checking The Crankshaft; Checking The Connecting Rods Oil Clearance - Yamaha EH63 Service Manual

PISTONS, CAMSHAFT, CRANKCASE, AND CRANKSHAFT
1
2
3
4
5
6
7
8
9
1
10
a
Top ring
End gap (installed):
0.20–0.40 mm (0.0079–0.0157 in)
Limit:
1.50 mm (0.0590 in)
2nd ring
End gap (installed):
0.20–0.40 mm (0.0079–0.0157 in)
Limit:
1.50 mm (0.0590 in)
Oil ring
End gap (installed):
0.20–0.70 mm (0.0079–0.0276 in)
Limit:
1.50 mm (0.0590 in)

CHECKING THE CRANKSHAFT

1.
Check:
• Crankshaft sprocket "1"
Damage/wear  Replace the crankshaft.
2.
Measure:
• Crank pin outside diameter "a"
Out of specification  Replace.
Use a micrometer.
Crank pin outside diameter:
38.956–38.970 mm (1.5336–1.5342 in)
Limit:
38.900 mm (1.5314 in)
CHECKING THE CONNECTING RODS OIL
CLEARANCE
TIP
Measure the oil clearance if replacing the crankshaft or
connecting rod.
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