
Noise and vibration of propeller shafts
1. Deformation of front or rear pro-
peller shaft
2. Propeller shafts out-of-balance
3. Worn or damaged centering
bush on layshaft flexible coupling
flange
4. Worn U-joint
5. Loose grease seal retainer on
spline joint of front or rear pro-
peller shaft
6. Insufficient greasing of spline
joints
Lubrication leak
1. Loose grease seal retainer on
spline joint of front or rear pro-
peller shaft
2. Damaged layshaft CV-joint boot
Removal and refitting
Place the vehicle on a lift or over an inspection pit, provide
free rotation of front and rear wheels from one or both sides of the
vehicle.
Reliably anchor the vehicle, release handbrake and place the
gearshift lever in neutral.
Remove the front and rear propeller shafts.
Place fixture A.70025 on the layshaft flexible coupling 3 (see
fig. 3-14) and, while turning the shaft, undo the bolt nuts that are
fastening the flexible coupling to the gearbox output shaft flange.
Remove the transfer box (see subsection. "Transfer box") in
assembly with the intermediate shaft. Undo the pin nuts that are
fastening the intermediate shaft joint to the transfer box input
shaft flange and remove the intermediate shaft.
The refitting of propeller shafts is carried out in reverse order.
Before refitting the intermediate shaft in assembly with the trans-
fer box, place the flexible coupling centering ring on the gearbox
output shaft. When refitting the layshaft, ensure the alignment of
the gearbox and the transfer box shafts (see "Refitting the trans-
fer box").
Before refitting the layshaft, grease the inner surface of the
flange centering bush with 2-3 gr of òêìë-4.
Inspection without dismantle
After cleaning and washing the propeller shafts, check the
shaft U-joints for smooth and easy rotation and absence of sig-
nificant axial and radial gaps.
Check the layshaft balance on a balance bench, as follows.
It is not recommended to dismantle the propeller shafts, if the
yokes are turning smoothly, there is no jamming, the mis-align-
ment of the drive axle shafts does not exceed 1.716 N•mm (175
grf•mm), the layshaft - 2.16 N•mm(200 grf•mm) and there is no
lubricant leak from the spider bearing seals and the layshaft pro-
tective shroud.
Dismantling
Rear and front shafts.
Make marks (with paint or punch) to
note mutual location of mating parts so that to refit them in the
same position and avoid misalignment of shafts.
Place the front (rear) shaft in vice with aluminum jaws.
Remove the circlips using round-nose pliers.
Press out the bearing housing from the U-joint yoke. Proceed
as follows:
- place the propeller shaft so that one of the yokes will be
based on rest 1 (fig. 3-50). Move the other yoke (pos.3) with the
help of the press rod through special bush 2 down until it will be
pressed against the spider;
- turnover the yoke, repeat the described operations, i.e.
move the other end of the yoke down to press against the spider.
When performing these operations the opposite spider bearing
will partially leave the yoke aperture and in the formed gap
between the yoke and spider it will be possible to place bush 1
(fig. 3-51) with a side notch for further complete dismantle;
- place bush 1 (see fig. 3-51) on the spider stud, move the U-
joint yoke down to press out the bearing;
- using the above specified procedure, press out the other
spider bearings.
Layshaft.
Disconnect the flexible coupling from flange 5 (see
fig. 3-49). Note the amount and location of the coupling and bal-
ance washers 17 on the flange, so that to refit them in place.
In case of damage of the protective cover 6 or shroud 14,
when it is required to inspect the joints and the quality of greas-
ing, note the location of the U-joint in relation to the flexible cou-
pling flange, and dismantle the U-joint using the procedure
described in subsection "Front wheel drive".
Inspection
Eccentricity check.
Place the front (rear) propeller shaft
between the centers on a special bench and while turning it,
check the runout, which should not exceed:
- 0.5 mm in 50 mm from the end weld seams;
- 0.3 mm in the middle part.
If the runout exceeds the specified values, straighten the
shaft under a press or renew.
81
1. Rectify under press or renew
2. Check and balance shafts (see
"Shaft balancing")
3. Renew coupling flange bush
4. Repair joints and renew worn
parts
5. Tighten grease seal and com-
press retainer, renew oil seal in
case of oil leak
6. Grease spline joints with îËÓÎ-1
or îËÓÎ-2ì using oil cups
1. Tighten grease seal and com-
press retainer, renew oil seal
2. Dismantle joint, renew greasing
and boot. In case of damage -
renew joint assembly
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