Iveco Daily. Manual — part 251
Figure 57
Figure 58
33101
Fit the rear bearing (2) on the false pinion 99370296 (1).
Position the false pinion 99370296 (1) including the rear
bearing (2) into its seat on rear axle casing (3).
Fit the front bearing, the transmission connecting flange and
the bevel pinion retaining nut and tighten so as to remove
end play and to enable false pinion rotation.
33102
8.00
2
S =
- 0.05
3.90 + 4.10
2
S =
- (
± 0.05)
Set dial gauge 99395728 (1) including support (3) on false
pinion 99370296 (2).
Direct suitably the dial gauge previously set to zero (see
Figure 51) to position the rod to the bottom of the gearing
case supporting bearing housing.
33103
Repeat this operation for the other bearing and take note of
both found values.
Pinion adjustment ring thickness is obtained through the
following formula:
S =
- ( + B )
A
1
+ A
2
2
”S” = thickness of the adjustment rings to be positioned
between bevel pinion rear bearing outer ring and rear axle
casing.
”A1” = value found on right housing
”A2” = value found on left housing
”B” = reference value marked on bevel pinion (see Figure 60)
Example:
S = 4.00 - 0.05
S = 3.95
Adjustment ring thickness shall therefore be: 3.95 mm.
Figure 59
84
REAR AXLE 450517/2
D
AILY
Base - May 2004
Figure 60
33104
Figure 61
33099
Choose an adjustment ring having the same thickness ob-
tained by using the formula shown in Figure 59 and fit it into
the rear axle casing after removing rear taper roller bearing
outer ring previously mounted.
Use beater 99374093 (1) to fit definitely the rear taper roller
bearing outer ring into rear axle casing (2).
Figure 62
Heat the rear bearing (1) to 100
°C for approx. 15’ into an
air-circulation furnace and then fit it down onto the bevel
pinion (2).
32481
Figure 63
Position the fixed spacer (2) and the adjustment ring (3),
previously used to obtain the specified rolling torque, on the
bevel pinion (1).
32482
Figure 64
Position the complete bevel pinion into the rear axle casing.
Heat the front bearing (1) to 100
°C for approx. 15’ into an
air-circulation furnace and then fit it down onto the bevel
pinion (2).
33111
If the value marked on the pinion is preceded by
positive sign (+), it shall be subtracted from the
value obtained by the sum divided by two of the
housings, whereas it shall be added if preceded by
negative sign (-).
NOTE
REAR AXLE 450517/2
85
D
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Figure 65
74730
Fit the seal ring (2) in the axle casing with tool 99374201 (1).
Figure 66
Fit the transmission connecting flange (1) and the bevel
pinion retaining nut (2).
33113
Figure 67
74731
Assemble the flange (3) and prevent rotation with tool
99370317 (1).
Using the torque wrench (2), tighten the bevel pinion flange
(3) retaining nut to the correct torque value.
Figure 68
32480
Using the torque wrench 99389819 (1), measure the rolling
torque of the bevel pinion.
If the value is incorrect disassemble the pinion (2, Figure 64),
and replace the adjuster ring (3, Figure 63) with a suitable
ring.
Refit the pinion and repeat the rolling torque check.
Figure 69
33116
Fit gearing case supporting bearing outer rings (2) and then
position the gearing case (1), previously fitted, in the rear axle
casing.
Differential unit refitting
The rolling torque must be measured at an ambient
temperature of 25
°C, making the pinion turn at a
speed of 50 rpm after it has made 10 turns.
NOTE
86
REAR AXLE 450517/2
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Base - May 2004
Figure 70
Insert the spacer (2), adjuster ring (1), adjuster ring (4) and
then spacer (3).
33117
Figure 71
Refit caps (1) taking into account the marks made at removal.
Use dynamometric wrench 99389827 (2) to tighten the
fastening screws to the specified torque.
Set gearing case supporting bearings and check total rolling
torque.
33119
Figure 72
33107
Use dynamometric wrench 99389819 (1) to check total
rolling torque:
Figure 73
Position magnetic dial gauge 99395684 (1) and check the
clearance between the pinion and crown on four equidistant
teeth on the crown. The average of the measurements must
equal the required value. If a different clearance is found, remove
the caps (3) again and swap over the assembly position of the
adjustment rings (1 and 4, Figure 70).
If this is not sufficient, replace the adjustment rings with ones
of a different thickness, but the total thickness must still be
the same as that of the adjustment rings removed.
This is so as not to change the total rolling torque.
Apply a thin layer of Prussian blue on ring gear teeth by brush.
Turn the pinion and measure the impression of the contact
of the pinion toothing on the crown wheel toothing.
Here we illustrate the possible contacts with the corrections
to obtain precise coupling of the crown wheel and pinion.
33121
If the value is incorrect, replace the adjuster rings (1 and 4,
Figure 70) with rings of the correct thickness.
Ct = 2.5 + (
x 0.99)
Cp = bevel pinion bearing rolling torque
Cd = 2
÷ 2.8 Nm (0.2 ÷ 0.29 kgm)
Ct = Cp + (
x 0.99)
Cd
R
Ct = total rolling torque
R = Rear axle reduction ratio
Example:
Ct = 2.5 + 0.71
Ct = 3.21 Nm (0.33 kgm)
2.8
3.91
The rolling torque must be measured at an ambient
temperature of 25
°C, making the pinion turn at a
speed of 50 rpm after it has made 10 turns.
NOTE
REAR AXLE 450517/2
87
D
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