wsm STW37 Workshop Manual page 155

STW34, STW37, STW40, WSM
Oil Clearance between Crankshaft Journal and Crankshaft
Bearing 2
1. Put a strip of plastigauge 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.
NOTE
• Be sure not to move the crankshaft while the bearing case
screws are tightened.
Factory specification
Oil clearance between
crankshaft and
crankshaft bearing 2
Allowable limit
Crankshaft O.D. Factory specification
Crankshaft bearing 2 I.D. Factory specification
(Reference)
• Undersize dimensions of crankshaft journal
Undersize
2.8 to 3.2 mm radius
Dimension A
0.11 to 0.12 in. radius
1.0 to 1.5 mm radius
Dimension B
0.040 to 0.059 in. radius
59.721 to 59.740 mm dia.
Dimension C, D
2.3513 to 2.3519 in. dia.
The crankshaft journal must be fine-finished to higher than = 0.4S
*Holes to be de-burred and edges rounded with 1.0 to 1.5 mm (0.040 to
0.059 in.) relief.
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-S76
0.0400 to 0.104 mm
0.00158 to 0.00409 in.
0.20 mm
0.0079 in.
59.921 to 59.940 mm
2.3591 to 2.3598 in.
59.980 to 60.025 mm
2.3615 to 2.3631 in.
0.2 mm 0.4 mm
0.008 in. 0.016 in.
2.8 to 3.2 mm radius
0.11 to 0.12 in. radius
1.0 to 1.5 mm radius
0.040 to 0.059 in. radius
59.521 to 59.540 mm dia.
2.3434 to 2.3440 in. dia.
9Y1211109ENS0124US0
0.1 mm
0.0039 in.
9Y1211109ENS0125US0
ENGINE
KiSC issued 11, 2014 A