Table of contents: There are noises coming from the…↓ There are noises emitted by the main…↓ The pinion shaft rotates but the…↓ The axle shaft fails again ↓ There is a loss of lubricating fluid ↓
There are noises coming from the rear wheels of the car
Tire noise. Check that the tires are the correct size for the vehicle.
The disc mount on the axle flange has become loose. Check the condition of the rim, wheel hub, studs and wheel nuts. Tighten the fasteners or replace defective components.
The wheel is out of balance or the disc is bent. Balance the wheel or replace the disk.
The brake components are faulty. Check the condition of the rear wheel brakes (see the section on diagnostics of brake system malfunction). Replace defective components.
The axle shaft and/or axle housing are faulty. Check and replace defective components.
The axle shaft and/or axle housing sleeve are bent. Check and replace defective components.
There are noises emitted by the main gear
The driveshaft or cardan joint has become loose. Check, tighten the fasteners, or replace the defective joint.
The lubricating fluid level has dropped. Check for signs of oil leaks, if any are found, eliminate the cause. Top up with the required grade of oil.
The main gear drive pinion flange nut has become loose. Apply sealant to the nut and tighten to the required torque.
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Final drive components are worn or damaged. Perform a major overhaul of the final drive.
The pinion shaft rotates but the vehicle does not move
The axle shaft is damaged. Remove the axle shaft assembly and replace if necessary.
The bolts of the crown (driven) gear of the main transmission are cut off. Remove the final drive assembly and replace the bolts.
The differential gears are damaged. Perform a major overhaul of the final drive.
Note: If the axle shaft fails, remove the final drive assembly and check for foreign particles and metal filings inside the crankcase. Clean the crankcase thoroughly.
The axle shaft fails again
Clutch is not used/functioning correctly. Change your driving style, check the proper functioning of the clutch.
The bridge arm is bent. Replace the rear axle housing.
The car is often overloaded. Try not to load the vehicle beyond the permissible limit.
There is a loss of lubricating fluid
The main gear pinion seal is faulty. Check it out (see accompanying illustration). Replace the seal, check the flange surfaces.
The axle shaft seal is faulty. Remove the axle shaft and replace the seal.
There is a leak through the final drive housing gasket. Remove the final drive assembly and replace the gasket.
The leak occurs through pores or cracks in the main gear housing. Perform the necessary repairs or replace the crankcase.
Note: Before cleaning the front axle assembly to check for signs of oil leaks, check the crankcase vent hose for leaks (see accompanying illustration). if leaks do not appear when the bridge is cold, take the car for a drive, warming up the bridge to normal operating temperature, then carefully inspect the crankcase for traces of leaks through the smallest pores and cracks.