Oil Clearance Between Crankshaft Journal And Crankshaft Bearing 1; Replacement Of Crankshaft Bearing 1 - Nanni N4.40 Workshop Manual

03-M-E3B, 03-M-DI-E3B, 03-M-E3BG, WSM
Oil Clearance between Crankshaft Journal and Crankshaft
Bearing 1
1. Measure the O.D. of the crankshaft journal with an external
micrometer.
2. Measure the I.D. of the crankshaft bearing 1 with an internal
micrometer.
3. Calculate the oil clearance.
4. If the oil clearance is more than the allowable limit, replace the
crankshaft bearing 1.
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.
Factory spec.
Oil clearance between
crankshaft journal and
crankshaft bearing 1
Allowable limit
Crankshaft journal O.D. Factory spec.
Crankshaft bearing 1 I.D. Factory spec.
(Reference)
• Undersize dimensions of crankshaft journal
0.2 mm
Undersize
0.008 in.
2.8 to 3.2 mm radius
Dimension A
0.11 to 0.12 in. radius
1.0 to 1.5 mm relief
*Dimension B
0.040 to 0.059 in. relief
59.721 to 59.740 mm dia.
Dimension C
2.3513 to 2.3519 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.

Replacement of Crankshaft Bearing 1

(When removing)
1. Press out the used crankshaft bearing 1 with the replacing tool.
(See page "SPECIAL TOOLS".)
(When installing)
1. Clean a new crankshaft bearing 1 and crankshaft journal bore,
and apply engine oil to them.
2. Make sure that the seam (1) of the new bearing 1 (2) points to
the exhaust manifold side (see the figure). Then press fit the
new bearing 1 (2) with the replacing tool.
Dimension (A) Factory spec.
(1) Seam
(2) Crankshaft Bearing 1
(3) Cylinder Block
1-S94
ENGINE
0.0400 to 0.118 mm
0.00158 to 0.00464 in.
0.20 mm
0.0079 in.
59.921 to 59.940 mm
2.3591 to 2.3598 in.
59.980 to 60.039 mm
2.3615 to 2.3637 in.
0.4 mm
0.02 in.
2.8 to 3.2 mm radius
0.11 to 0.12 in. radius
1.0 to 1.5 mm relief
0.040 to 0.059 in. relief
59.521 to 59.540 mm dia.
2.3434 to 2.3440 in. dia.
M00000003ENS0139US1
4.20 to 4.50 mm
0.166 to 0.177 in.
(A) Dimension
M00000003ENS0140US1
KiSC issued 06, 2009 A