Checking The Crankshaft - Yamaha F40BMHD Service Manual

POWR
CRANKSHAFT AND PISTON
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2. Measure:
• Side clearance
Out of specification → Replace the
piston and piston rings as a set.
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)

CHECKING THE CRANKSHAFT

Measure:
• Crankshaft journal diameter
• Crank pin diameter
• Crankshaft runout
Out of specification → Replace the
crankshaft.
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)
5-44
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