Yamaha 40V Manuel de service télécharger pdf (Page 111)

5-36

POWR

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.

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Yamaha 40V Manuel de service Page 111