Dacia Pick-Up 1304/1305/1307. Service manual - part 81

33

REAR BEARING ELEMENTS

33 - 15

   

     PLATE DRIVE REAR AXLE DIFFERENTIAL

- place continuos sealant material layer on the whole contact surface of the rear axle

taking care not to close the attachment wholes of differential casing;

- mount the differential assembly and tighten the screws at the required couple of

2 - 2,5 daNm.

NOTE: The interchangeable of the gasket with the layer is not affected.

DIFFERENTIAL REMOUNTING – ADJUSTMENT

Continue the attachment and mounting of the following items :

- the new adjustment bushing of the bearing;
- the 30 x 72 x 28,75 conical balls bearing;
- the deflector ;
- the 42 x 72 x 12 annular oil seal.

Attach and tighten:

- the washer;
- the flange nut.

NOTE: When assembling the cardanic flange, check the wear degree of the surface

in contact with the annular oil seal.

After remounting , the rear axle must be sealed.
The sealing test is performed by blowing air at a 0,15 – 0,20 bars pressure through

the aeration valve seat.

No air leaking is accepted.

T

IGH TENING

 

MO MENTS

- The screws for the attachment of gear rim to the differential  box ..............9- 11 daN.m
- The two screws of the differential bearings adjustment nuts lock washer........ 2 daN.m
- The four nuts of the attachment stud bolts of the bearing cups..............3,5 - 5 daN.m
- The differential drive pinion nut tightening moment        ................ .........9 - 11 daN.m

ATTENTION: After tightening ,the nut shall be locked by straining.

REAR BEARING ELEMENTS

33

33 - 16

PLATE DRIVE REAR AXLE DIFFERENTIAL

MOUNTING CONDITIONS

1

. Adjustment of the conical distance 54  

0 

 mm 

 

between the rim axis and the front

surface of the pinion head.

                

- 0,1

2

. The propeller shafts and the differential pinions shall be selected so that a

maximum 0,1 mm clearance is obtained in the whole differential assembly, one propeller
shaft being locked, the moment required for the rotation of the propeller shaft should be
maximum 1 daN.m.

3

.  The geared rim shall be adjusted so that the clearance between the pinion and

the rim measured on the outer diameter of the rim is between 0,12 – 0,25 mm, measured in
three points, placed at 120 

0

.

4

. The resistant moment due to the initial tightening of the differential bearings,

without differential drive pinion, shall be between 0,12 – 0,15 daNm , measured within
the range of the gear clearance.

5

. The rotation moment of the differential drive pinion, without the mounted rim,

is  0,15 - 0,20 daN.m.

DIFFERENTIAL  ADJUSTMENT

To be performed  before and upon

remounting

This implies three operations :
1. Adjustment of the conical distance
2. Adjustment of the gearing clearance
3. Adjustment of the differential bearings

1

. ADJUSTMENT OF THE CONICAL DISTANCE

It supposes to measure and correct the distance between the front face of the differential

drive pinion and symmetry axis of the rim.

The following operations shall be performed:

- place the outer housing of the bearing in the differential casing;
- place the conical balls bearing;
- place the 8512 41196 – 08 standard gauge and then place the 8151 – 5544 gauge

checking device.

33

REAR BEARING ELEMENTS

33 - 17

    

    PLATE DRIVE REAR AXLE DIFFERENTIAL

Check the distance 90 +/- 0,015 mm by reading the value shown by the device.

OBSERVATION: Regarding the mounting conditions:

        - in case there are accidental deviations from the absolute value 54, on the front
side of differential drive pinion it will be marked the effective deviation in hundredth;

     - the conical distance of  54  

0 

 mm  shall be algebraic corrected with a.m. value.

       

   - 0,1

The adjustment of the value shall be done

as follows:

- for the 0 value read on the device, choose

a washer of A value (value A is the one written
on the differential pinion; for example:  185
means A = 1,85 mm);

- for negative values ( example : - 0,05 )

choose a washer of A value  = + 0,05 mm;

-  for positive values  ( example: + 0,05 )

choose a washer of A value = - 0,05 mm.

Remove the bearing.
Place the adjustment washer on the

differential drive pinion and press the bearing.

The differential drive pinion and the pressed

bearing shall be placed in the differential casing.

Place the  8512 4313 standard gauge on the front side of the differential drive pinion,

then place the gauge checking device and measure the

 

 54  

0 

 mm

 distance value.

              - 0,1

According to the value shown on the gauge, the washer shall be replaced or not.

REAR BEARING ELEMENTS

33

33 - 18

PLATE DRIVE REAR AXLE DIFFERENTIAL

2

. 

 

ADJUSTMENTOF THE PINION – RIM GEARING CLEARANCE

Checking of the clearance of the conical assembly gear is performed initially by estimation,

by hand.
   If the clearance felt is too big, act upon the nut on the side of the casing; by unscrewing
it a number of rotations, until a smaller clearance in the conical assembly gear is obtained,
or, perform the opposite operation clearance is too small.

The following operations shall be performed:
Place in the differential drive pinion casing, the casing – rim assembly,  mount the

bearing casings, the adjustment nuts, observing the marking made upon dismounting.

Tighten the bearings casings nuts at a moment of  a 4 – 5 daNm.
Screw the adjustment nuts until the clearance value of the gear may be estimated by

hand.

Mount a dial comparator with the tester perpendicular on the rim tooth flank and check

the gearing clearance : it must be between 0,12 – 0,25 daNm.

The measurement shall be made in three equidistant points.
The bearings tightening correction is performed by means of the adjustment nuts.
Mark the position of the nuts in correspondence with the casing.