Yamaha F4A Service Manual

E
CRANKCASE, CRANKSHAFT AND CAMSHAFT
POWR
a
b
2. Measure:
9Side clearance
Out of specification ® Replace the
piston and piston rings as a set.
Crankshaft inspection
1. Measure:
9Crankshaft runout
Out of specification ® Replace the
crankshaft.
Camshaft inspection
1. Inspect:
9Camshaft
9Decompressor
9Camshaft gear teeth
Wear/Damage/Crack ® Replace.
9Weight and pin
Unsmooth operation ® Replace.
5-32
Side clearance:
Top ring
aa
:
0.04 ~ 0.08 mm
(0.002 ~ 0.003 in)
2nd ring
bb
:
0.02 ~ 0.06 mm
(0.001 ~ 0.002 in)
Crankshaft runout limit:
0.03 mm (0.0012 in)

Yamaha F4A Specifications

General

Brand	Yamaha
Model	F4A
Category	Outboard Motor
Language	English