Yamaha 40V Service Manual download pdf (Page 105)

5-30

POWR

CRANKCASE AND CYLINDER BODY

Piston to cylinder clearance

1. Calculate:

● Piston clearance

Out of specification → Replace piston

and piston ring and/or cylinder.

Oil pump driven gear inspection

1. Inspect:

● Oil pump driven gear

Crack/Pitting/Wear → Replace.

Cylinder body and crankcase installation

1. Install:

● Cylinder body

● Crankshaft and piston

NOTE:

● Align the piston ring end gaps with the

respective locating pins.

● Fit the bearing and the labyrinth seal

locating pins in the cylinder body.

2. Apply:

● Gasket maker

Onto the connecting surfaces of the

crankcase and cylinder body.

NOTE:

● Clean the connecting surfaces of the

crankcase and cylinder body before apply-

ing the Gasket maker.

● Gasket maker should be so applied that it

does not overflow the contacting surface.

Piston

clearance

Cylinder

bore

–

Piston

diameter

Piston clearance:

0.060 ~ 0.065 mm

(0.0024 ~ 0.0026 in)

1 2 ... 100 101 102 103 104 105 106 107 108 109 110 ... 223 224

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Yamaha 40V Service Manual Page 105