Yamaha 40V - Crankshaft Inspection

5-36
POWR
E
CRANK SHAFT AND PISTON
Crankshaft inspection
1. Measure:
● Crank width A
● Crank width B
Out of specification → Replace.
2. Measure:
● Runout
Use a V-blocks and dial gauge.
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)
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.