• Remove
rod
and cap from crankpin.
• Measure the compressed Plastigage at its wid-
est point.
004586
Connecting
rod
big
end oil clearance:
• Standard: 0.0010 to 0.0018
in.
(0.025 to 0.045
mm).
• Service limit: 0.0025
in.
(0.063 mm)
If measurement exceeds service limit, replace
connecting
rod
and/or crankshaft.
Crankshaft
Measure crankshaft thrust clearance. If measure-
ment exceeds service
limit, replace crankshaft
and/or crankcase.
Crankshaft thrust clearance:
• Service limit: 0.024
in.
(0.6 mm)
004588
POWERHEAD
CYLINDER/CRANKCASE/PISTON ASSEMBLY
Measure the crankshaft journal outside diameter
in
the thrust and axial directions at two positions
as shown:
004589
Check for the following:
•
Difference of the measurements at two posi-
tions (Taper).
• Difference between the thrust and axial mea-
surements (Out-of-round).
Crankshaft
journal outside diameter: 7
• Standard: 1.2594 to 1.2598
in.
(31.989 to
32.000 mm)
Taper and Out-of-round:
• Service limit: 0.0004
in
(0.010 mm)
If measurement exceeds service limit, replace
crankshaft.
Check main bearing condition. If pitting, flaking,
burning, or excessive wear
is
found, replace both
upper and lower halves.
IMPORTANT: Always replace both bearing
halves, never replace only half of a bearing set.
004590
161
E
o
U
Qj
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Qj
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ii
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