In the article, we will consider possible malfunctions of the rear axle of the UAZ-3151 car

- Cause of malfunction


Increased noise:

  • - Increased side clearance in the main gear engagement
  • - The teeth of the final drive gears are worn out

Replace worn gears; it is not necessary to compensate for wear by adjusting the position of the gears in order to avoid jamming of the main gear

- the bearings of the final drive gear are worn out:

adjust or replace worn bearings;

- differential bearings are worn out;

replace worn bearings;

- the fastening of the driven gear to the differential is loosened;

tighten the driven gear bolts;

- Loosening the final drive gear bearings

Tighten the nut as far as it will go

- Incorrect adjustment of the main gear engagement on the contact

Adjust the engagement according to the contact patch (if there is no wear on the teeth)*

- Reduced oil level in the axle housing

Add oil to the crankcase up to the lower edge of the oil filler hole

Increased noise (when turning or slipping a car):

- Malfunctions in the parts of the differential (wear of the gear teeth of the rubbing surfaces of the satellite box and the surfaces of other parts mating with them)

Replace worn parts

Violent knocking (when carburetor throttle pedal depressed after coasting):

- Increased lateral clearance in the main gear engagement due to tooth wear

Replace gears as a set

- Wear of differential parts

Replace worn parts

- Wear of axle splines

Replace axle shafts

Oil leaking through the pinion collar:

- Wear of the cuff or surface (under the cuff) of the flange of the cardan shaft to the drive gear

Replace the collar or flange

- Increased oil level in the axle housing

Check and correct oil level

- Safety valve dirty

Clean the valve (breather)

Oil leak in the plane of the axle housing connector:

- Loose fastening of the cover and crankcase or damage to the gasket

Tighten nuts or replace gasket (0.12 mm gasket thickness; release paper material)

Oil leak in the plane of the crankcase connector and the drive gear front bearing cover:

- Loose lid fastening or damaged seals

Tighten the bolts or replace the gaskets (the thickness of the gasket pack should be 1.3 times greater than the gap between the ends of the cover and the crankcase; the material of the gaskets is cardboard)