11.1. Check of serviceability of the back bridge


We check an inhaling of all threaded connections and, if necessary, we tighten them.
The cap of a sapun has to be cleared of dirt and rotate freely.
Hands we put effort about 10 kgfs along an axis of the hung-out wheel and we define existence of a side play of a half shaft. It is allowed no more than 0,7 mm. The parking brake at this check has to be released.
Insignificant leak of oil (otpotevaniye) from under a cuff of the forward bearing of the main transfer is allowed, but at strong oiling of a reducer and bottom of the car over the main transfer the cuff should be replaced.
It is possible to define noise in the back bridge and, respectively, need of repair by results of the following tests.
Test 1. Smoothly we accelerate the car on the flat road from speed 20 to 90 km/h. At the same time we listen to noise and we notice the speed at which it appears and disappears.
We release a pedal of "gas" and we wiretap the car in the braking mode the engine. Usually noise arises and disappears at the same speeds, both at acceleration, and at delay.
Test 2. We accelerate the car to the speed of 100 km/h, we transfer the gear shifting lever to neutral situation, we switch off ignition and freely we slide to a stop. At the same time we watch the nature of noise at various speeds of delay.

ATTENTION! At switching off of ignition be careful. It is impossible to turn a key more, than it is necessary for switching off of ignition as in situation "parking" (when the key is taken out from the lock) the anti-theft device can work and the steering wheel will be blocked.

In the first option we tested a reducer in the mode of dispersal and braking under the loading created by the engine. In the second – without it. If the sound is present only at the first test – as its reason reducer gear wheels, bearings of the leading gear wheel or differential can serve. If noise is shown in both cases – the source it needs to be looked for in other place.
Test 3. We install the transmission lever in neutral situation, we launch the engine and gradually we increase the frequency of rotation of a bent shaft. We compare the arising noise with noticed earlier. If they are similar to the noise arising at the first test it indicates that they proceed not from a reducer.
Test 4. The noise found at the first test and which are absent at the subsequent are caused by a reducer. For confirmation we lift back wheels, we launch the engine and we include the fourth transfer. We are convinced that noise really proceed from a reducer, but not from other knots or details.