Nanni N4.40, Workshop Manual

Page: 165 / 175

ENGINE
03-M-E3B, 03-M-DI-E3B, 03-M-E3BG, WSM
1-S95
Oil Clearance between Crankshaft Journal and Crankshaft
Bearing 2
1. Put a strip of Plastigage on the center of the journal.
2. Install the bearing case and tighten the baring case screws 1 to
the specified torque, and remove the bearing case again.
3. Measure the width that it becomes flat with the scale to get the
oil clearance.
4. If the oil clearance is more than the allowable limit, replace the
crankshaft bearing 2.
5. If the same dimension bearing is not applicable because of the
crankshaft journal wear, replace it with an undersize one. Refer
to the table and figure.
NOTE
• When you tighten the bearing case screws, do not move
the crankshaft.
(Reference)
• Undersize dimensions of crankshaft journal
M00000003ENS0141US1
Oil clearance between
crankshaft and
crankshaft bearing 2
Factory spec.
0.0400 to 0.104 mm
0.00158 to 0.00409 in.
Allowable limit
0.20 mm
0.0079 in.
Crankshaft journal O.D. Factory spec.
59.921 to 59.940 mm
2.3591 to 2.3598 in.
Crankshaft bearing 2 I.D. Factory spec.
59.980 to 60.025 mm
2.3615 to 2.3631 in.
Undersize
0.2 mm
0.008 in.
0.4 mm
0.02 in.
Dimension A
2.8 to 3.2 mm radius
0.11 to 0.12 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
0.040 to 0.059 in. relief
1.0 to 1.5 mm relief
0.040 to 0.059 in. relief
Dimension C, D
59.721 to 59.740 mm dia.
2.3513 to 2.3519 in. dia.
59.521 to 59.540 mm dia.
2.3434 to 2.3440 in. dia.
The crankshaft journal must be fine-finished to higher than Rmax = 0.4S
*Holes to be de-burred and edges rounded with 1.0 to 1.5 mm
(0.040 to 0.059 in.) relief.
KiSC issued 06, 2009 A