Yamaha F40BMHD, Service Manual

Page: 256 / 537

CRANKSHAFT AND PISTON
5-44
E
POWR
2. Measure:
• Side clearance
Out of specification
→
Replace the
piston and piston rings as a set.
CHECKING THE CRANKSHAFT
Measure:
• Crankshaft journal diameter
• Crank pin diameter
• Crankshaft runout
Out of specification
→
Replace the
crankshaft.
a
a
Side clearance
Top ring
0.04 - 0.08 mm
(0.002 - 0.003 in)
2nd ring
0.03 - 0.07 mm
(0.001 - 0.003 in)
Oil ring
0.04 - 0.18 mm
(0.002 - 0.007 in)
a
Crankshaft journal diameter
42.984 - 43.000 mm
(1.6923 - 1.6929 in)
Crank pin diameter
32.984 - 33.000 mm
(1.2986 - 1.2992 in)
Crankshaft runout limit
0.03 mm (0.001 in)