Kubota WSM STV32 Workshop Manual page 132

STV32 · STV36 · STV40, WSM
Oil Clearance between Crankshaft Journal and Crankshaft
Bearing 2
1. Put a strip of plastigage on the centre of the journal.
2. Install the bearing case and tighten the bearing 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.
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.
A Be sure not to move the crankshaft while the bearing case
screws are tightened.
Factory spec.
Oil clearance between
crankshaft and
crankshaft bearing 2
Allowable limit
Crankshaft O.D. Factory spec.
Crankshaft bearing 2
Factory spec.
I.D.
(Reference)
A Undersize dimensions of crankshaft journal
Undersize
2.8 to 3.2 mm radius
Dimension A
0.1102 to 0.1260 in. radius
1.0 to 1.5 mm radius
Dimension B
0.0394 to 0.0591 in. radius
59.721 to 59.740 mm dia.
Dimension C, D
2.35122 to 2.35197 in. dia.
The crankshaft journal must be fine-finished to higher than
Crankshaft Sleeve Wear
1. Check the wear on the crankshaft sleeve (1).
2. If the wear exceeds the allowable limit or when the engine oil
leaks, replace the crankshaft sleeve.
Wear of sleeve Allowable limit
(1) Crankshaft Sleeve
1-S60
0.040 to 0.104 mm
0.00157 to 0.00409 in.
0.20 mm
0.0079 in.
59.921 to 59.940 mm
2.35909 to 2.35984 in.
59.980 to 60.025 mm
2.36142 to 2.36319 in.
0.2 mm 0.4 mm
0.008 in. 0.016 in.
2.8 to 3.2 mm radius
0.1102 to 0.1260 in. radius
1.0 to 1.5 mm radius
0.0394 to 0.0591 in. radius
59.521 to 59.540 mm dia.
2.34335 to 2.34409 in. dia.
0.1 mm
0.0039 in.
ENGINE
(0.8-S)
0000006463E
0000005512E
KiSC issued 04, 2006 A