Skoda Felicia

1. At decrease in efficiency of return of the engine, and also in case of admissions of ignition it is necessary to perform measurement of compression pressure in cylinders which analysis of results will allow to define the general condition of the engine. Regular performance of check of compression pressure will help to reveal symptoms of malfunctions in time and to prevent development of their reasons.
2. Special компрессометр for diesel engines, equipped with a transitional nozzle, it is connected to openings under installation of nozzles of injection of fuel, or incandescence candles. The measuring instrument costs rather much and it makes sense to buy it in private use not always. In case of need it is possible to address to services of specialists of car service.
3. If special instructions are not attached to a kompressometr, it is necessary to follow the following general rules:

a) The engine has to be heated-up up to the normal working temperature, the air filter is cleaned, and the battery is completely charged;
b) Before implementation of the procedure it is necessary to turn out all four nozzles (or all four glow plugs). Nozzles should be removed complete with washers of flame arresters in order to avoid blowing of the last.
c) The electromagnetic locking valve has to be disconnected in order to avoid casual start of the engine or ejection of fuel.
d) Do not forget to disunite the multicontact socket of the main braid of an electrical wiring of the engine located behind the top support of the left rack of a forward suspension bracket.
4. In view of the fact that the air path of the diesel engine is not equipped with a butterfly valve, need for keeping of the accelerator pedal which is squeezed out disappears automatically.
5. Results of measurement of a compression should be compared to the required parameters given in Specifications at the beginning of this Chapter. In case of doubts address for consultation specialists of car service.
6. The reason of decrease in compression pressure on the diesel engine to establish not so simply as on petrol. The way with addition of oil in cylinders in this case does not pass in view of risk of subsidence of oil on walls of vortex cameras, instead of its lowering to piston rings. The main moments of interpretation of results of check are given below.
7. Results of measurement of pressure in all cylinders have to be very close to each other. The dispersion in 5 bars indicates existence internal malfunctions in the engine. In the serviceable engine pressure has to increase very quickly. The low indication at the first step which is followed by its gradual increase on the subsequent indicates wear of piston rings. If pressure does not rise at all, it is necessary to check tightness of closing of valves and a condition of laying of a head of cylinders (also the possibility of existence of cracks in a body actually of a head is not excluded).
8. Equally low pressure in two next cylinders with big degree of probability indicates violation of integrity of laying of a head around a crossing point between these cylinders. Presence of traces of cooling liquid at a case will confirm this assumption.
9. If value of a compression considerably exceeds norm, it is necessary to make decarbonization of cylinders, having removed nagaroobrazovaniye products on their walls.

1. Measurement of speed of pressure decrease in the cylinder after giving in it compressed air is the basis for a method. The procedure is some kind of alternative to check of compression pressure, results it allow to obtain fuller information on a condition of the engine in view of an opportunity to quicker establish a leak source (piston rings, valves, laying, etc.).
2. In view of need of use of the special equipment, performance of this check should be charged to specialists of car service.