wsm B2420 Workshop Manual page 125

B2420, WSM
Oil Clearance between Crankshaft Journal and Crankshaft
Bearing 2 (Crankshaft Bearing 3)
1. Put a strip of plastigage on the center of the journal.
2. Install the bearing case and tighten the baring case screws 1 to
the specified torque, and remove the bearing case again.
3. Measure the amount of the flattening with the scale and get the
oil clearance.
4. If the clearance exceeds the allowable limit, replace the
crankshaft bearing 2 (crankshaft bearing 3).
5. If the same size bearing is useless because of the crankshaft
journal wear, replace it with an undersize one referring to the
table and figure.
NOTE
• Be sure not to move the crankshaft while the bearing case
screws are tightened.
Factory specification
Oil clearance between
crankshaft journal and
crankshaft bearing 2
Allowable limit
Crankshaft journal O.D.
Factory specification
(Intermediate)
Crankshaft bearing 2 I.D. Factory specification
Factory specification
Oil clearance between
crankshaft journal and
crankshaft bearing 3
Allowable limit
Crankshaft journal O.D.
Factory specification
(Flywheel side)
Crankshaft bearing 3 I.D. Factory specification
(Reference)
• Undersize dimensions of crankshaft journal
Undersize
2.3 to 2.7 mm radius
Dimension A
0.091 to 0.10 in. radius
1.0 to 1.5 mm relief
*Dimension B
0.040 to 0.0591 in. relief
47.734 to 47.750 mm dia.
Dimension C
1.8793 to 1.8799 in. dia.
51.721 to 51.740 mm dia.
Dimension D
2.0362 to 2.0370 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-S53
0.034 to 0.095 mm
0.0014 to 0.0037 in.
0.20 mm
0.0079 in.
47.934 to 47.950 mm
1.8872 to 1.8877 in.
47.984 to 48.029 mm
1.8892 to 1.8909 in.
0.034 to 0.098 mm
0.0014 to 0.0038 in.
0.20 mm
0.0079 in.
51.921 to 51.940 mm
2.0442 to 2.0448 in.
51.974 to 52.019 mm
2.0463 to 2.0479 in.
0.20 mm 0.40 mm
0.0079 in. 0.016 in.
2.3 to 2.7 mm radius
0.091 to 0.10 in. radius
1.0 to 1.5 mm relief
0.040 to 0.0591 in. relief
47.534 to 47.550 mm dia.
1.8715 to 1.8720 in. dia.
51.521 to 51.540 mm dia.
2.0284 to 2.0291 in. dia.
9Y1210436ENS0093US0
KiSC issued 06, 2012 A
ENGINE