Crankshaft - Nanni N3.30 Workshop Manual

05-E3B, 05-E3BG, WSM

(4) Crankshaft

Crankshaft Side Clearance
1. Set a dial indicator with its tip on the end of the crankshaft.
2. Measure the side clearance by moving the crankshaft to the front
and rear.
3. If the measurement exceeds the allowable limit, replace the
thrust bearings.
4. If the same size bearing is useless because of the crankshaft
journal wear, replace it with an oversize one referring to the table
and figure.
Factory spec.
Crankshaft side
clearance
Allowable limit
(Reference)
• Oversize dimensions of crankshaft journal
0.20 mm
Oversize
0.0079 in.
51.50 to 51.70 mm
Dimension A
2.028 to 2.035 in.
28.20 to 28.25 mm
Dimension B
1.111 to 1.112 in.
2.3 to 2.7 mm radius
Dimension C
0.091 to 0.10 in. radius
The crankshaft journal must be fine-finished to higher than ∇∇∇∇
Crankshaft Alignment
1. Support the crankshaft with V blocks on the surface plate at both
end journals.
2. Set a dial indicator with its tip on the intermediate journal.
3. Measure the crankshaft alignment.
4. If the measurement exceeds the allowable limit, replace the
crankshaft.
Crankshaft alignment Allowable limit
S-63
DIESEL ENGINE
0.15 to 0.31 mm
0.0059 to 0.012 in.
0.50 mm
0.020 in.
0.40 mm
0.016 in.
51.60 to 51.80 mm
2.032 to 2.039 in.
28.40 to 28.45 mm
1.119 to 1.120 in.
2.3 to 2.7 mm radius
0.091 to 0.10 in. radius
(0.8-S)
W10317070
0.02 mm
0.0008 in.
W10330010
KiSC issued 12, 2007 A