Subaru Forester

1997-2005 of release

Repair and car operation



Subaru Forester
+ Cars Subaru Forester
+ The maintenance instruction
+ Routine maintenance
- The engine
   Design features and principle of functioning of the engine, - the general information and adjustment клапанных backlashes
   Major repairs and engine service - the general information
   Check of pressure of oil
   Check компрессионного pressure in cylinders
   Diagnostics of a condition of the engine with vacuum gauge application
   Removal of the power unit from the car - preparation and safety measures
   Removal and engine installation
   Alternative variants of schemes of regenerative repair of the engine
   Order of dismantling of the engine by its preparation for major repairs
   Dismantling of drive ГРМ, - removal, check of a condition and installation of components
   Removal, dismantling, check, assemblage and axis installation коромысел, - engines SOHC
   Removal, check of a condition and installation of camshafts
   Service of heads of cylinders
   Service of the block of cylinders
   Greasing system - the general information
   Removal, service and installation
   Removal, check and installation маслоохладителя - only engines DOHC
   Trial start and обкатка the engine after major repairs
+ Systems of cooling, heating
+ The power supply system and release
+ Engine electric equipment
+ Control systems of the engine
+ Gear change box
+ Coupling, трансмиссионная a line
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
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Check компрессионного pressure in cylinders

Results of check компрессионного pressure in cylinders allow to define the general condition of components of the top part of the engine (pistons, piston rings, valves, linings of a head of cylinders, etc.) and qualitatively to estimate degree of their deterioration. That is especially important, the analysis of the information received as a result of check allows to narrow a spectrum of the possible reasons of falling of a compression in cylinders, precisely enough having adhered refusal to infringements of functioning of quite concrete components, whether it be piston rings, valves, their saddles or a head lining.

The engine should be heated-up to normal working temperature, and the storage battery is completely charged.


 PERFORMANCE ORDER

1. Make sure of completeness of gymnastics of the storage battery.
2. Warm up the engine to normal working temperature.
3. On models with a turbo-supercharging disconnect all coils of ignition.
4. Begin with procleaning of candle niches (blow their compressed air as which source in this case the ordinary bicycle pump perfectly will approach). The Primary goal is prevention of hit of dust in cylinders during performance of measurements.
5. Turn out from the engine all spark plugs (Routine maintenance see the Head).
6. Disconnect electroconducting from injectors of injection of fuel.
7. Fix throttle заслонку in completely open position.


It is preferable to use to connection компрессометра a nozzle carving, instead of clamping type


 PERFORMANCE ORDER

1. Establish компрессометр in a candle aperture of the first cylinder.
2. Turn the engine at least on seven steps of compression and consider the measuring instrument indication. On the serviceable engine pressure should accrue quickly enough. Low pressure upon the first step, accompanied by its gradual increase on the subsequent, speaks about deterioration of piston rings. If at further проворачивании a shaft pressure does not rise, it can be regarded as the certificate of leaks of valves or infringement of tightness of a lining of a head of cylinders (the probability of presence of cracks in a head is not excluded also). The congestion of adjournment on working facets of plates of valves also can lead to decrease компрессионного pressure. Write down the maximum indication компрессометра.
3. Repeat procedure for the remained cylinders of the engine. Compare results to standard requirements (Specifications see).
4. At excessively low results of measurement, fill in in each of cylinders through a candle aperture a little impellent oil (two-three teaspoons) and repeat check.
5. If oil addition leads to pressure increase, it speaks about deterioration of piston rings. If the compression does not increase, the reason of its decrease are leaks of valves or infringement of tightness of a lining of a head. Leaks of valves can be connected with a burn-out of their saddles, either deformation/burn-out or mechanical damages of working facets.
6. If pressure of compression is equally underestimated in two next cylinders with high degree of probability it is possible to speak about infringement of integrity of a lining of a head within its crosspiece between the given cylinders. Presence of a cooling liquid at impellent oil will confirm the given assumption.
7. If pressure in one of cylinders approximately on 20 % more low, than in other and it is accompanied by infringement of stability of turns of idling, it is necessary to estimate degree of deterioration of cams of a drive of corresponding valves on a camshaft.
8. Unusual overestimate компрессионного usually is a consequence of pressure excessive нагарообразования in combustion chambers. In this case the head of cylinders should be removed for the purpose of carrying out декарбонизации.
9. At excessively low results of measurements, and also in case of infringement of uniformity of distribution of pressure between cylinders it will be useful to hold testing of the engine for leaks in the conditions of a car-care centre workshop. Such check will allow to define precisely a source of leak and to estimate degree of its gravity.
10. Establish into place safety locks and make on the car a short trip for the purpose of restoration written down in memory of the processor of adjusting parametres.