2) Wear
•
With an outside micrometer measure the
diameter of the crankshaft journals and
pins in the directions as shown, and
compare the measured values to deter-
mine the amount of wear.
•
If the amount of wear is beyond the limit,
have the crankshaft ground and install
undersize bearings. However, if the
amount of wear is within the limit, you
can correct the wear using an oil stone or
oiled grinding paper of fine grain size.
(Be sure to use grinding paper which has
been immersed in oil.)
* Undersize bearings available
Standard
0.25 (Inside diameter is 0.25 mm lesser than the standard size.)
0.50 (Inside diameter is 0.50 mm lesser than the standard size.)
0.75 (Inside diameter is 0.75 mm lesser than the standard size.)
1.00 (Inside diameter is 1.00 mm lesser than the standard size.)
Undersize bearings are available in 4 different sizes as indicated above, and the crankshaft
can be reground to the above sizes.
Note : When regrinding the crankshaft
as described below, the fillet sec-
tion ‘R’ should be finished cor-
rectly. Avoid sharp corners or
insufficient fillet.
* Standard values of ‘R’
Crankshaft Pin ‘R’: 4.5
0
-0.2
Crankshaft journal ‘R’: 4
0
-0.2
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