Peugeot 406

Since 1996 of release

Repair and car operation

3.1.2. Check of pressure of compression

THE GENERAL DATA

Check of a condition of the engine can be made by measurement of pressure of compression in cylinders. If this check to make regularly it is possible to learn in advance the beginning of deterioration of the engine, without waiting the moment when deterioration will be shown in a low overall performance of the engine.

PERFORMANCE ORDER

1. Warm up the engine to working temperature, thus the accumulator should be completely charged. Unscrew spark plugs. 2. Remove sockets from fuel atomizers of system of injection of fuel. 3. In an aperture of a candle of the first cylinder establish компрессометр. 4. The assistant should press an accelerator pedal against the stop and turn the engine a starter. After проворачивания коленвала pressure of compression should increase by one or two turns to a maximum and then be stabilised. Make record of the maximum received result. 5. Similarly check up other cylinders. 6. Pressure of compression in all cylinders should not differ more than on two units. Pay attention that the compression size should increase quickly on the serviceable engine; low pressure of compression upon the first turn коленвала, accompanied by gradual increase in pressure at the subsequent turns коленвала, specifies in deterioration of piston rings. The low size of pressure on the first turn коленвала which slightly increases further, specifies in a thinness прилегания the valves, the punched lining of a head of the block of cylinders or crack presence in a head of the block of cylinders. Deterioration of the ends of cores of valves can lead to low pressure of compression also. 7. Peugeot does not define exact pressure of compression, however if pressure of compression in cylinders is less 10 it speaks about deterioration of the engine. 8. If pressure in one cylinder lowered conduct following test. Fill in through a candle aperture in the cylinder of a few engine oil and check up pressure of compression. 9. If oil pouring in the cylinder increases pressure of compression, it specifies that the cylinder or piston rings is worn out. 10. Low pressure in two next cylinders specifies in a lining burn-out between cylinders. 11. If pressure in one cylinder is less on 20 %, than in the others and the engine works unstably idling, it specifies in the worn out cam of a cam-shaft. 12. If pressure of compression is too high, it specifies that the combustion chamber is covered by a thick layer of a deposit. 13. After this check screw in spark plugs and connect to them high-voltage wires.