ENGINE
M6060, M7060, WSM
1-S73
Oil Clearance between Crankshaft Journal and Crankshaft
Bearing
1. Clean the crankshaft journal (2) and crankshaft bearing.
2. Put a strip of plastigauge on the center of the journal.
• Do not put the Plastigauge into the oil hole of the journal.
3. Install the crankcase 2 (1).
4. Tighten the crankcase 2 mounting screws to the specified
torque.
5. Remove the crankcase 2 (1) again.
6. Measure the width that it becomes flat with the scale to get the
oil clearance.
7. If the clearance more than the allowable limit, replace the
crankshaft bearing.
8. If the same dimension bearing is not applicable because of the
crankshaft journal wear, replace it with an undersize one. Refer
to the table and figure.
(Reference)
• Undersize dimensions of crankshaft journal
9Y1210828ENS0114US0
Oil clearance between
crankshaft journal and
crankshaft bearing
Factory specification
0.030 to 0.073 mm
0.0012 to 0.0028 in.
Allowable limit
0.20 mm
0.0079 in.
Crankshaft journal O.D. Factory specification
79.977 to 79.990 mm
3.1487 to 3.1492 in.
Undersize
0.2 mm
0.008 in.
0.4 mm
0.02 in.
Dimension A
2.8 to 3.2 mm radius
0.11 to 0.12 in. radius
2.8 to 3.2 mm radius
0.11 to 0.12 in. radius
*Dimension B
1.0 to 1.5 mm relief
0.040 to 0.059 in. relief
1.0 to 1.5 mm relief
0.040 to 0.059 in. relief
Dimension C
79.777 to 79.790 mm dia.
3.1409 to 3.1413 in. dia.
79.577 to 79.590 mm dia.
3.1330 to 3.1334 in. dia.
The crankshaft journal must be fine-finished to higher than Rmax = 0.8S
*Holes to be de-burred and edges rounded with 1.0 to 1.5 mm
(0.040 to 0.059 in.) relief.
(1) Crankcase 2
(2) Crankshaft Journal
(3) Crankcase 1
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