1-S58
L4400 , WSM
ENGINE
Crankshaft Alignment
1. Support the crankshaft with V blocks on the surface plate and set
a dial indicator with its tip on the intermediate journal at right
angle.
2. Rotate the crankshaft on the V blocks and get the misalignment
(half of the measurement).
3. If the misalignment exceeds the allowable limit, replace the
crankshaft.
W1033001
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 each
direction as shown in the figure.
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.
(Reference)
• Undersize dimensions of crankpin
W1033106
Crankshaft alignment
Allowable limit
0.02 mm
0.00079 in.
Oil clearance between
crankpin and crankpin
bearing
Factory spec.
0.025 to 0.087 mm
0.00098 to 0.00343 in.
Allowable limit
0.20 mm
0.0079 in.
Crankpin O.D.
Factory spec.
46.959 to 46.975 mm
1.84878 to 1.84941 in.
Crankpin bearing I.D.
Factory spec.
47.000 to 47.046 mm
1.85039 to 1.85221 in.
Undersize
0.2 mm
0.008 in.
0.4 mm
0.016 in.
Dimension A
3.3 to 3.7 mm radius
0.1299 to 0.1457 in. radius
3.3 to 3.7 mm radius
0.1299 to 0.1457 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
46.759 to 46.775 mm dia.
1.84091 to 1.84154 in. dia.
46.559 to 46.575 mm dia.
1.83303 to 1.83366 in. dia.
(0.8S)
The crankpin must be fine-finished to higher than
∇∇∇∇
KiSC issued 07, 2007 A
Tractor Manuals Scotland - Please Do Not Copy
Tractor Manuals Scotland
