wsm M7040 - Page 209

ENGINE
M6040, M7040, WSM
1-S77
Oil Clearance between Crankshaft Journal and Crankshaft
Bearing
1. Clean the crankshaft journal (3) and crankshaft bearing.
2. Put a strip of press gauge on the center of the journal.
IMPORTANT
• Never insert the press gauge into the oil hole of the journal.
3. Install the crankcase 2 (1) and tighten the crankcase 2 mounting
screws to the specified torque, and remove the crankcase 2 (1)
again.
4. Measure the amount of the flattening with the scale and get the
oil clearance.
5. If the clearance exceeds the allowable limit, replace the
crankshaft bearing.
(Reference)
• Undersize dimensions of crankshaft journal.
9Y1210143ENS0123US0
Replacing Crankshaft Sleeve
1. Remove the used crankshaft sleeve.
2. Set the sleeve guide (2) to the crankshaft gear (4).
3. Heat a new sleeve (3) to a temperature between 150 and
200 °C (302 and 392 °F), and fix the sleeve to the crankshaft as
shown in figure.
4. Press fit the sleeve using the auxiliary socket for pushing (1).
(See page G-49.)
NOTE
• Mount the sleeve with its largely chamfered surface facing
outward.
• Keep the space "A" between the edge of the crankshaft
gear and the crankshaft sleeve.
9Y1210143ENS0124US0
Crankshaft journal O.D. Factory specification
79.977 to 79.990 mm
3.1487 to 3.1492 in.
Oil clearance between
crankshaft journal and
crankshaft bearing
Factory specification
0.030 to 0.073 mm
0.0012 to 0.0029 in.
Allowable limit
0.20 mm
0.0079 in.
Undersize
0.20 mm
0.008 in.
0.40 mm
0.016 in.
Dimension A
2.8 to 3.2 mm radius
0.1102 to 0.1260 in. radius
2.8 to 3.2 mm radius
0.11 to 0.12 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
0.040 to 0.059 in. relief
Dimension C
79.777 to 79.790 mm dia.
3.1408 to 3.1413 in. dia.
79.577 to 79.590 mm dia.
3.1330 to 3.1334 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) Crankcase 2
(2) Crankcase 1
(3) Crankshaft Journal
(1) Auxiliary Socket for Pushing
(2) Sleeve Guide
(3) Crankshaft Sleeve
(4) Crankshaft Gear
A: More than 6.5 mm (0.26 in.)
KiSC issued 07, 2012 A