Checking The Crankshaft - Yamaha YFM45FAR Service Manual

CRANKSHAFT AND OIL PUMP
3.Check:
Oil pump operation
G
Unsmooth → Repeat steps #1 and #2 or
replace the defective parts.

CHECKING THE CRANKSHAFT

1.Measure:
Crank width A
G
Out of specification → Replace the
crankshaft.
Side clearance D
G
Out of specification → Replace the
crankshaft.
Runout C
G
Out of specification → Replace the
crankshaft.
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Crankshaft reassembling point:
The crankshaft 1 and the crank pin 2 oil
passages must be properly interconnected
with a tolerance of less than 1 mm (0.04 in).
*****************************************************
CAUTION:
The buffer boss and woodruff key should
be replaced when removed from the
crankshaft.
4 - 68
ENG
Crank width:
62.95 ~ 63.00 mm
(2.4783 ~ 2.4803 in)
Big end side clearance:
0.25 ~ 0.75 mm
(0.0098 ~ 0.0295 in)
<Limit>: 1.00 mm (0.0394 in)
Runout limit:
C1: 0.03 mm (0.0012 in)
C2: 0.03 mm (0.0012 in)