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5
8
9
1.
Crank pin nut (sprocket side)
2.
Flywheel (sprocket side)
3.
Connecting rods
4.
Crank pin roller and retaining set
5.
Flywheel (gear side)
Lapping Connecting Rod Races
Connecting rod lower races that are likely to clean up within
range of oversize bearing rollers and are otherwise in service-
able condition, should be trued and sized with
ROD LAPPING ARBOR (Part No.
1.
Clean lap before using.
2.
See
Figure 3-71.
Clamp lap into lathe chuck, carefully
load lap with #220 grit grinding compound, mixed with oil.
Adjust lathe to turn at approximately 150-200 RPM.
3.
Carefully slide connecting rod over lap. Adjust lap to a
dragging, but free, fit in rod race.
3-52
3
7
6
10
6.
Crank pin
7.
Crank pin key
8.
Crank pin nut (gear side)
9.
Pinion bearing inner race
10. Flywheel washer (2)
Figure 3-70. Flywheel and Connecting Rod Assembly
CONNECTING
HD-96740-36).
www.PlanDeGraissage.org
2
10
4
Counterbore for
stepped washer (10)
4.
Start lathe and work rod back and forth, over full length of
lap. Hold rod as near race end as possible.
5.
Check rod frequently. When rod is lapped true and all
traces of pit marks or grooves are cleaned up, wash and
blow rod dry.
6.
Repeat lapping procedure for other rod race.
7.
Bearing races should have a soft velvety appearance
and be free of shiny spots.
1
Under cut
(shaded area)
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