Jeep Grand Cherokee

1993-1999 of release

Repair and car operation

Major maintenance of the engine - the general information

It is not always easy to define when follows and whether it is necessary to make complete major maintenance of the engine in general. At the solution of this task it is necessary to take into consideration a set of factors.

Considerable run far not necessarily is a sign of need of carrying out major maintenance and on the contrary, small run at all is not a guarantee of a good condition of the engine. Probably, the most important factor here is frequency of performance of procedures of routine maintenance of the car. The engine on which change of oil and the oil filter were regularly and often made, it is equal as other procedures on leaving were honestly carried out, with big degree of probability will smoothly serve many and many thousands kilometers. At neglect carrying out major maintenance of the engine can already be demanded by performance of procedures of routine maintenance later absolutely insignificant time.

The excessive consumption of impellent oil usually is a sign of need of paying of attention to a condition of piston rings, maslootrazhatelny caps and/or directing plugs of valves. Before coming to conclusion about a bad condition of these components make sure that losses of oil occur not owing to its leaks. To help scoping of the works which performance is required during carrying out major maintenance of the engine carrying out check of kompressionny pressure (The section Check of kompressionny pressure will help with cylinders).

Capacity loss, unstable operation of the engine, excessive noise of the klapanny mechanism and the increased fuel consumption can be signs of need of carrying out major maintenance of the engine, in particular if they are present all at the same time. If complete setup of the engine does not help to correct a situation, carrying out the general mechanical works on restoration of internal components of the engine is required.

Performance of major maintenance of the engine means recovery of its operational characteristics to spetsifikatsionny values of the new unit. During major maintenance replacement of piston rings and restoration of mirrors of cylinders (a pro-point and a honingovaniye) are usually made. If the pro-point of cylinders is made in a car-care center workshop, also pistons of the repair size usually are at the same time established. Replacement of radical and shatunny bearings, and also camshaft bearings is also usually made. The pro-point and restoration of necks of a cranked shaft can be in case of need made. The full complex of service of the klapanny mechanism which components by the time of need of carrying out major maintenance of the engine seldom are in a satisfactory condition is usually carried out.

At the same time with carrying out major maintenance of the engine can be restored and other components, such as the distributor, a starter and the generator. As a result of the carried-out complex of works the restored engine should receive characteristics new and smoothly serve still many thousands kilometers of run.

Before starting major maintenance of the engine attentively familiarize with the description of procedures demanding performance and try to imagine nature of the forthcoming work clearly. Performance of major maintenance of the engine should not cause special difficulties, under conditions of accurate following to instructions, existence of the necessary tool and careful observance of requirements of Specifications, however demands patience and certain expenses of time. It is necessary to plan refusal of using the car for term at least in two weeks, in particular if any of components it is necessary to send for repair or restoration in a car-care center workshop. Make sure available all necessary spare parts and take care of preliminary rent or acquisition of the special tool and the equipment.

The most part of works can is made by means of the ordinary metalwork tool though for determination of the validity to the further use of some details use of the exact measuring equipment is necessary. Examination of a condition of separate elements can be made at car repair shop where you receive the corresponding recommendations about their replacement.

In summary it is necessary to notice that to achieve the maximum term of trouble-free service of the restored engine, its assembly after carrying out major maintenance should be made in irreproachably pure conditions.