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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 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 air filters, 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 stem seals and (or) valve guides. 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 directing plugs. In order to determine the probable cause of the fault, measure the engine compression. Check the oil pressure gauge screwed into place contact emergency oil pressure gauge 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 bearing and (or) the details 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 resolve a repair with the replacement or repair of parts. 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. Rods and radical loose leaves must also be replaced, if necessary, performed regrinding crankshaft to restore regulatory clearances and crankpins with indigenous and connecting rod bearings. 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 distributor, starter and alternator. As a result repaired engine should possess qualities of almost new unit and sustain considerable run without failure.
A warning  When overhaul is necessary to replace such important details as the cooling system hoses, thermostat and water pump. Radiator must be carefully tested for tightness and cleanliness of internal channels. At engine major repairs also should be replaced and 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, in the presence of all the required tools and accessories, as well as the implementation of all technical requirements of major repairs to execute simply, however, would require 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.
A warning 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 and crankshaft, 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 new repair 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 you should not take hasty decisions unreasonable - otherwise the repair can be more expensive because of the installation or repair of worn 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.
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