BMW 3 Series E30

since 1983-1994 release

Repair and operation of the car

It is not always easy to come to a conclusion about expediency of complete capital repairs of the engine as it is necessary to be based on a number of objective indicators.

The big run is not a sufficient indicator of need of carrying out capital repairs, on the other hand, the small run does not exclude need of carrying out capital repairs. The most important indicator most likely is timeliness of the current maintenance of the engine. At timely change of oil and the filter, and also when performing all other necessary works on service, the engine serves reliably throughout many thousands of kilometers of a run. On the contrary, insufficient on volume or untimely maintenance can be the reason of sharp reduction of a resource of the engine.

The raised consumption of oil indicates wear of piston rings, the directing plugs of valves and oil scraper caps. It is necessary to be convinced that leaks are not the reason of the raised oil consumption, and only after that to draw a conclusion about unfitness of piston rings and the directing plugs of valves. To define a probable cause of malfunction, measure a compression in engine cylinders.

For scoping of the forthcoming works check a compression in engine cylinders. Carry out also tests by means of the vacuum gage and define character of indications of this device. Check oil pressure the manometer screwed to the place of the sensor of pressure of oil and compare result of check to standard value. If oil pressure low, then can be the cause wear of radical and conrod bearings or details of the oil pump.

Loss of power, "failures" in operation of the engine, a detonation or metal knocks, the increased noise from the gas-distributing mechanism, the increased fuel consumption indicate the need carrying out capital repairs, especially, if all these signs of abnormal work are shown at the same time. If performance of all adjustments does not lead to improvement, then the only means of elimination of abnormal operation of the engine are capital repairs. Capital repairs consist in restoration of details of the engine to the state specified in specifications for the new engine. When carrying out capital repairs pistons and piston rings are replaced, cylinders are chiseled or honningutsya. After repair of cylinders which is carried out in a specialized workshop installation of repair pistons will be required. Connecting and radical rods of the crankshaft, and also cover of basic necks of a cam-shaft are also subject to replacement, if necessary it is necessary to proshlifovat crankshaft necks before restoration of normal gaps with connecting and radical rods. As a rule, also valves as their state at the time of repair as a rule not absolutely satisfactory are subject to repair. During capital repairs of the engine repair of such units as a starter, the generator and the distributor of ignition is also carried out. As a result the repaired engine has to have qualities of the new unit and sustain a considerable run without refusals.

At capital repairs it is necessary to replace such important details of the cooling system as hoses, drive belts, the thermostat and the pump of cooling liquid. The radiator should be surveyed on tightness and purity of internal channels. If you bought the repair engine, or the block of cylinders of an incomplete complete set, then some suppliers do not give a guarantee for operation of these units without high-quality washing of a radiator. At capital repairs of the engine it is also recommended to replace the oil pump.

It is necessary to address in workshops of car service only after full dismantling of the engine and check of a condition of all details, especially the block of cylinders to solve what operations on service and repair will be carried out in workshops.

In conclusion we will note that assembly of any units should be carried out with all care in the pure room to avoid further failures of the repaired engine and to ensure its reliable functioning.