Operation Manual

BX25, RCK54(P)-23BX, RCK60B-23BX, LA240, BT60l, WSM
ENGINE
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3TMABAB1P0748
Oil Clearance between Crankpin and Crankpin Bearing
1. Clean the crankpin and crankpin bearing.
2. Put a strip of plastigage on the center of the crankpin.
3. Install the connecting rod cap and tighten the connecting rod
screws to the specified torque, and remove the cap again.
4. Measure the amount of the flattening with the scale, and get the
oil clearance.
5. If the oil clearance exceeds the allowable limit, replace the
crankpin bearing.
6. If the same size bearing is useless because of the crankpin wear,
replace it with
an undersize one referring to the table and figure .
• NOTE
• Never insert the plastigage into the crankpin oil hole.
• Be sure
not to move the crankshaft while the connecting rod
screws are tightened.
Oil clearance between
Factory spec.
0.020 to 0.051mm
0.00079 to 0.00201 in.
crankpin and crankpin
bearing
Allowable limit
0.15 mm
0.0059 in.
Crankpin O.D. Factory spec.
33.959 to 33.975 mm
1.33697 to 1.33760 in.
Crankpin bearing I.D. Factory spec.
33.995 to 34.010 mm
1.33839 to 1.33898 in.
(Reference)
• Undersize crankpin bearing
Undersize Bearing Code Number Marking
0.2mm
0.008 in.
Crankpin bearing 02 15861-22970 020 US
0.4mm
0.016 in.
Crankpin bearing 04 15861-20980
040 US
• Undersize dimensions of crankpin
Undersize
0.2mm
0.008 in.
0.4mm
0.016 in.
Dimension A
2.3 to 2.7 mm radius
0.091 to 0.106 in.radius
2.3 to 2.7 mm radius
0.091 to 0.106 in.radius
'Dimension B
1.0 to 1.5 mm relief
0.0394 to 0.0591 in. relief
1.0 to 1.5 mm relief
0.0394 to 0.0591 in. relief
Dimension C
33.759 to 33.775 mm dia.
1.32910 to 1.32973 in. dia.
33.559 to 33.575
mm dia.
1.32122 to 1.32185 in. dia.
(0.8S)
The crankshaft journal must be fine-finished to higher than VVVV.
'Holes to be de-burred and edges rounded with 1.0 to 1.5 mm
(0.0394 to 0.0591 in.) relief.
Wl1625390
1-853