Compression check in engine cylinders

The best power output with comparatively low fuel consumption engine shows only when the piston ring provides a good seal. To determine how tight valves and piston rings manometer is checked individual compression cylinders. For the diesel engine also needs a special adapter, which is screwed in place of the nozzle into the cylinder head. Recommended Volkswagen adapter is numbered 1323 / 2A. In addition, you will need at least one O-ring thermal insulation, since the compression check, do not use o-rings installed.

The engine must be heated to operating temperature, the piston rings to provide a better seal.

Compression can also be measured in the holes of glow plugs. But again, you need an appropriate adapter (Fig. 450). This adapter is used Ford (GV2168).

Depending on whether the adapter is used, proceed as follows.

Measurement of compression holes glow

Remove the fuel pump relay from the fuse box (the driver's seat, legroom). Relay is designated R13.

Start the engine. After some time it stops (blocked fuel flow).

Remove the cover of the engine, as it was described when removing the cylinder head (see. Fig. 391).

Disconnect the electric glow of the bus pins.

Remove the spark plugs and tighten them to a place suitable adapter. First screw the adapter into the first cylinder.

Screw the pressure gauge into the adapter.

Have an assistant crank the engine starter. Scroll until the engine until the pressure gauge does not show the greatest value, ie Arrow will no longer rise.

Check other cylinders at a time.

Finally, reinstall all removed parts. If the engine does not start, then you probably forgot to replace the fuel pump relay.

Measurement of compression nozzle openings

Remove the relay, as described above, and let the engine run until until it stops. You can also disconnect the cable from the termination of the fuel supply to the fuel pump, and isolate it. Cable in this case, you have to bend to the side.

Remove all the fuel high-pressure nozzles and remove the injectors themselves (see. The relevant section). Place the nozzle on a clean cloth or paper.

Screw adapter with O-ring thermal insulation in the first hole nozzle and connect it with the pressure gauge (Fig. 451).

Have an assistant crank the engine starter. Scroll until the engine until the pressure gauge does not show the greatest value, ie Arrow will no longer rise.

Check other cylinders at a time.

It is normal, if the compression of any one of the cylinders does not fall below 80% of the best results obtained in the measurement of a cylinder. Low, unequal in different compression cylinders is the result of wear of piston rings, which can also be defined by increased oil consumption. With good compression, its value should be at least 19.0 bar. The nominal value of the compression is 25-30 bar. Based on the comparison of the measured values at a nominal value of compression, you can easily determine the degree of wear of the relevant components.

If the result of measurement approximately equal to the borders of wear, you should pour a little engine oil into the engine through the spark plug hole, and repeat the measurement. If the result is now proved to be better, we can assume that the reason for the low compression piston rings are worn out or developed the cylinder wall. If the result was approximately the same as the cause of low compression it is likely one or more malfunctioning valves. It may also be leaky cylinder head gasket. In any case, you should remove the cylinder head and a thorough inspection to determine the cause of the fault.

Again, remove the gauge and install the nozzle rings with thermal protection, as described in the relevant section.