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Engine Overhaul

It is not always easy to come to a conclusion about the advisability of a complete engine overhaul, as necessary based on a number of objective indicators.

The big run is not a sufficient indicator of the need for major repairs, on the other hand, small run does not exclude the need for major repairs. The most important indicator most likely is timeliness of current maintenance of the engine. At timely change of oil and filter, as well as the implementation of all other necessary works on service, the engine serves reliably throughout many thousand kilometers. On the contrary, insufficient on volume or untimely maintenance can cause a sharp reduction in engine life.

Increased consumption of oil specifies in deterioration of piston rings, valve guides and valve stem seals. Make sure that the leak did not cause increased oil consumption, and only after that to do a conclusion about unfitness of piston rings and valve guides. In order to determine the probable cause of the fault, measure the cylinder compressions (see. Subsection 3.1.1.2).

To determine the amount of work, check the engine compression. Spend as tested using vacuum gauge and define the nature of the indications of this device (see. Subsection 3.1.2.3).

Check the oil pressure gauge screwed into place the oil pressure sensor and compare the test result with the standard value. If the oil pressure is low, the cause may be the wear of indigenous and connecting rod bearings or parts of the oil pump.

Power loss, "failures" in engine work, a detonation or the metal knocks, increased noise from the timing, increased fuel consumption point to the need for major repairs, especially if all these signs of abnormal work are shown simultaneously. If performance of all adjustments does not improve, then the only way to eliminate the abnormal operation of a motor overhaul. Overhaul is to restore parts of the engine to a condition specified in the technical data for the new engine. During the overhaul replaced pistons and piston rings, chiseled or Honningbrew cylinders. After repair of cylinders, which is carried out in a specialized workshop, installation of repair pistons is required. Rods and radical loose crankshaft, as well as covers of basic necks of a cam must also be replaced, if necessary, should be abraded neck crank to the restoration of normal backlashes with rods and indigenous inserts. As a general rule, subject to repair and valves, as their condition at the time of repair is generally not quite satisfactory. During engine overhaul and repair of such units is carried out as a starter, the generator and the ignition distributor. As a result repaired engine should possess the qualities of the new unit and sustain considerable run without failure.

When overhaul is necessary to replace such important details as the cooling system hoses, drive belts, the thermostat and water pump. The radiator should be surveyed on tightness and cleanliness of internal channels (see. Section 4.3). If you bought the repair engine, or the engine block is missing, that some providers do not give a guarantee for the operation of these units without qualitative washing of a radiator. At engine major repairs also it is recommended to replace the oil pump.

Before starting engine overhaul read the description of the relevant procedures, make an impression of forthcoming amount of works and requirements to them. Subject to all rules and regulations, with all the necessary tools and devices, Repair is simple to perform, but will require a significant investment of time. Roughly it is required not less than two weeks, especially if for repair and restoration of details will have to address in a specialized workshop. Check the availability of spare parts and in advance take care of acquisition of necessary special tools and equipment. Almost all the work can be performed using a standard set of tools, but to test and determine the suitability of those or other details need precise measuring instruments. Often the inspection of the parts is carried out in specialized workshops in which also receive recommendations about replacement or restoration of those or other details.

Contact the service center workshops follows only after full dismantling of the engine and check the status of all the details, especially the cylinder block to decide which operations on service and repair will be carried out in workshops.

Since the state of the cylinder block is a determining factor in making a decision on its further repair or purchase of a new (or maintenance) of the cylinder, then to buy spare parts or carry out operations on machining of accompanying details follows only after careful check of its technical condition. Make it a rule that the true price of repair is time - did not have to pay for the installation of used or reconditioned parts.

In conclusion, the assemblage of any units should be carried out with great care in a clean room to avoid further refusals of the repaired engine and to ensure reliable operation.