E30 series BMW 3

since 1983-1994 of release

Repair and car operation

Today gear belts found "the second breath". Practically all automakers equip the cars with an elastic drive. German designers went further away. They widely apply a double gear belt (Duplex) as reliable connection of a cam-shaft with the krivoshipno-shatunny mechanism.

The gear belt has a number of advantages before a chain. It it is obvious more expensively. To make a belt it is much simpler, than a chain. By and large, it is the closed tape from the maslobenzostoyky rubber, reinforced by a kapron cord with pirvulkanizirovanny teeths to it. If to compare it to a chain, comparison will appear not in favor of the last. The belt is much easier than a chain that, naturally, should affect mass of the engine. Besides, the engine equipped with a belt, is much more silent than the colleague equipped with a chain. Also "elastic band" out of an engine casing that affects time of its installation or replacement is mounted. For example, at the author of these lines on GRM belt replacement with the subsequent its installation on labels 25–30 minutes leave. With a chain such focus will not pass.

At the correct service and control the gear belt goes long. Domestic producers, we will remind, give a guarantee on run in 60 thousand km, foreign – and that it is more. Rover managed to remove term of replacement of a belt to 160 thousand.

In what the correct control and service of this simple adaptation consists? Not less than each 15–30 thousand km correctness of situation and a belt tension should be checked. However it does not mean that it is necessary to remove only a casing and to check, whether on a place a belt. It is best of all to examine it, having removed from the engine. Sometimes it is difficult to notice that one of teeths overstrained. If it already occurred, be sure that he will not stretch. Therefore, having removed a belt, make on it a mark chalk, and further tooth behind tooth "banish" it. After installation it is also necessary to check situation directing and a natyazhitel. All these elements should be on one axial, otherwise the belt will work with a distortion that will not do it good.

Important factor for belt work – absence on its surface of oil. Whatever there was a maslobenzostoyky rubber from which the belt is executed, nevertheless it not that case when "porridge oil you will not spoil". Here oil just to the detriment. Therefore it is periodically necessary to pay attention to a condition of epiploons. And if you noticed an oil leak, try to eliminate it somewhat quicker. As practice shows, stay of a belt in the oil environment cuts its resource by half, and even three times.

If this control to ignore, consequences will not keep itself waiting long. Through 40-50 thousand km at the expense of a belt pulling the necessary tension weakens and it starts to whip. As a result of it the heavy cam-shaft rotates not synchronously, and with backlog. This asinkhroniya of operation of the motor leads to even bigger weakening of a belt. As a result there are excessive loads of teeths.

Break of several teeths in a row can lead to that once the cam-shaft remains motionless while the knee will rotate. During such moments open valves meet pistons. Result – a fiasco or a bend of the valve, its broken plugs, the broken-off cam-shaft. Is, however, and exceptions when break passes almost without serious consequences. However such it is possible only on those cars in which specially on this case there are pro-points in pistons. Our VAZs, namely cars, for example, treat them with engines VAZ-2105, 1300 cubic cm, and VAZ-2108, 1500 cubic see.

If the car is not equipped with such engine, break of a belt manages to the owner in the round sum connected with capital repairs of the engine. Cost, for example, a belt on BMW reaches $40. engine repair on the same Saab will cost $5000. For VAZ "nine" the belt can be bought for $25. And here repair of a cursor will pull for $400.