Crankshaft Inspection - Yamaha 40V Service Manual

POWR
CRANK SHAFT AND PISTON

Crankshaft inspection

1. Measure:
Crank width A
Crank width B
Out of specification → Replace.
Crank width A:
53.90 ~ 53.95 mm
(2.122 ~ 2.124 in)
Crank width B:
32.88 ~ 33.10 mm
(1.294 ~ 1.303 in)
2. Measure:
Runout
Use a V-blocks and dial gauge.
Out of specification → Replace.
Runout limit:
0.03 mm (0.001 in)
3. Measure:
Axial play
Out of specification → Replace.
Axial play limit:
2.0 mm (0.08 in)
4. Inspect:
Crankshaft bearing
Pitting/Rumbling → Replace.
CAUTION:
Do not spin bearing with air blower; this
can damage the bearing.
Also take care not to scratch the bearing
balls when cleaning.
5. Inspect:
Oil pump drive gear
Crack/Pitting/Wear → Replace.
5-36
E