Yamaha 40V Manuel de service télécharger pdf (Page 110)

5-35

POWR

CRANK SHAFT AND PISTON

Piston ring inspection

1. Inspect:

● Piston ring

Breakage/Damage → Replace.

2. Measure:

● End gap

Use a feeler gauge.

Out of specification → Replace.

NOTE:

Install the piston ring into the cylinder. Push

the ring with the piston crown.

End gap:

Top: 0.40 ~ 0.60 mm

(0.016 ~ 0.024 in)

2nd: 0.40 ~ 0.60 mm

(0.016 ~ 0.024 in)

End gap limit:

Top: 0.80 mm (0.031 in)

2nd: 0.80 mm (0.031 in)

Measuring point

20 mm (0.8 in)

3. Measure:

● Side clearance

Use a thickness gauge.

Out of specification → Replace piston

and/or ring.

Side clearance:

Top: 0.04 ~ 0.08 mm

(0.002 ~ 0.003 in)

2nd: 0.03 ~ 0.07 mm

(0.001 ~ 0.003 in)

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Yamaha 40V Manuel de service Page 110