Subaru Forester

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.

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.