Nanni N4.40, Workshop Manual

Page: 156 / 175

ENGINE
03-M-E3B, 03-M-DI-E3B, 03-M-E3BG, WSM
1-S86
Oil Clearance between Idle Gear Shaft and Idle Gear Bushing
1. Measure the idle gear shaft O.D. with an external micrometer.
2. Measure the idle gear bushing I.D. with an internal micrometer.
3. Calculate the oil clearance.
4. If the oil clearance is more than the allowable limit, replace the
bushing.
5. If the oil clearance stays more than the allowable limit, replace
the idle gear shaft also.
M00000003ENS0125US1
Replacement of Idle Gear Bushing
(When removing)
1. Press out the used idle gear bushing with the replacing tool.
(See page "SPECIAL TOOLS" .)
(When installing)
1. Clean a new idle gear bushing and idle gear bore, and apply
engine oil to them.
2. Press fit the new bushing with the replacing tool.
Make sure that the bushing end aligns the end of the idle gear.
M00000003ENS0126US1
Side Clearance of Balancer Shaft (for Balancer Model Only)
1. Set a dial indicator with its point on the balancer shaft.
2. Move the balancer shaft to the front and rear to measure the
side clearance.
3. If the measurement is more than the allowable limit, replace the
balancer shaft.
M00000003ENS0127US1
Balancer Shaft Bend (for Balancer Model Only)
1. Hold the balancer shaft with V blocks on the surface plate.
2. Set a dial indicator with its point on the middle journal at a high
angle.
3. Turn the balancer shaft slowly and read the variation on the
indicator.
4. If the measurement is more than the allowable limit, replace the
balancer shaft.
M00000003ENS0128US1
Oil clearance between
idle gear shaft and idle
gear bushing
Factory spec.
0.025 to 0.066 mm
0.00099 to 0.0025 in.
Allowable limit
0.10 mm
0.0039 in.
Idle gear shaft O.D. Factory spec.
37.959 to 37.975 mm
1.4945 to 1.4950 in.
Idle gear bushing I.D. Factory spec.
38.000 to 38.025 mm
1.4961 to 1.4970 in.
(A) When Removing (B) When Installing
Side clearance of
balancer shaft
Factory spec.
0.070 to 0.22 mm
0.0028 to 0.0086 in.
Allowable limit
0.30 mm
0.012 in.
Balancer shaft bend Allowable limit
0.02 mm
0.0008 in.
KiSC issued 06, 2009 A