Piston To Cylinder Clearance; Oil Pump Driven Gear Inspection; Cylinder Body And Crankcase Installation - Yamaha 40V Service Manual

POWR
CRANKCASE AND CYLINDER BODY

Piston to cylinder clearance

1. Calculate:
Piston clearance
Out of specification → Replace piston
and piston ring and/or cylinder.
Piston
=
clearance
Piston clearance:
0.060 ~ 0.065 mm
(0.0024 ~ 0.0026 in)

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.
5-30
Cylinder Piston
–
bore diameter
E