64
ZJ058A
2. Rotate the crankshaft slowly.
3. The reading must be 0.002 in. or crankshaft repair-
ing/replacing will be necessary.
Main Bearings
Check the main bearings for signs of pitting, scratches,
wear, or damage. If any of these conditions are found, the
bearings must be replaced.
Bearing Selection
NOTE: This information is needed only if the crank-
shaft or the engine cases have been replaced or if the
connecting rod and main bearings are out of specifi-
cations.
Select the proper bearing inserts for the replacement in
accordance with the crankshaft mark.
KC539A
The connecting rods go with a grade number mark. The
mark will be a number “1” or “2” located on the side sur-
face of rod as shown. Determine the replacement bearing
color by following the table.
KC527A
The crank cases go with a grade mark. The mark will be
“A” or “B” located on the side surface of the case as
shown. Determine the replacement bearing color by fol-
lowing the table.
KC538A
The crank balancer goes with a grade mark. The mark will
be “A” or “B” located on the balancer shaft as shown.
Determine the replacement bearing color by following the
table.
CAUTION
Always replace the bearings as a set; never replace one
side only or severe engine damage will occur
Crankshaft
Mark
Connecting Rod
Mark
Bearing Inserts Color
Choice
A
1
Black
A
2
Green
B
1
Green
B
2
Red
Crankshaft
Mark
Crankcase Mark
Bearing Inserts Color
Choice
A
A
Black
A
B
Green
B
A
Green
B
B
Red
