Oil Clearance Between Idle Gear Shaft And Idle Gear Bushing; Replacement Of Idle Gear Bushing; Side Clearance Of Balancer Shaft (For Balancer Model Only); Balancer Shaft Bend (For Balancer Model Only) - Nanni N4.40 Workshop Manual

03-M-E3B, 03-M-DI-E3B, 03-M-E3BG, WSM

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.
Factory spec.
Oil clearance between
idle gear shaft and idle
gear bushing
Allowable limit
Idle gear shaft O.D. Factory spec.
Idle gear bushing I.D. Factory spec.

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.
(A) When Removing

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.
Factory spec.
Side clearance of
balancer shaft
Allowable limit

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.
Balancer shaft bend Allowable limit
1-S86
ENGINE
0.025 to 0.066 mm
0.00099 to 0.0025 in.
0.10 mm
0.0039 in.
37.959 to 37.975 mm
1.4945 to 1.4950 in.
38.000 to 38.025 mm
1.4961 to 1.4970 in.
M00000003ENS0125US1
(B) When Installing
M00000003ENS0126US1
0.070 to 0.22 mm
0.0028 to 0.0086 in.
0.30 mm
0.012 in.
M00000003ENS0127US1
0.02 mm
0.0008 in.
M00000003ENS0128US1
KiSC issued 06, 2009 A