Contents: Petrol engines ⬇ Diesel engines ⬇
Petrol engines
Compression testing allows you to draw a conclusion about the engine's condition. The test determines the condition of the valves, pistons, and piston rings. A compression meter is needed to perform the test.
Attention! A diesel engine requires a compression tester with a large measurement range (40 bar). The difference between the two maximum compression values should not exceed 1 bar (for a diesel engine - 1.5 bar). If this difference is greater, this is a sign that the valves are defective, the piston rings are worn out, the cylinder wall is worn out, or the cylinder head gasket is defective. If the wear exceeds the permissible limits, the engine must be repaired or replaced.
To check compression, the engine must be warmed up.
Turn off the ignition. Disconnect the wire from terminal "15" of the ignition coil.
Engine with injection system, disconnect all connectors from the injectors to prevent fuel from entering the cylinders.
Disconnect the spark plug tips. For this purpose, it is recommended to use special pliers Hazet 1849.
Blow out the spark plug recesses in the cylinder head with compressed air and remove the spark plugs.
Turn the crankshaft several times with the starter.
Attention! Set the gearbox to neutral. Engage the parking brake.
Screw a compression gauge into the spark plug hole.
Have the assistant depress the accelerator pedal and keep it depressed for the duration of the test.
Turn on the starter as much as necessary to achieve a constant pressure in the compression gauge. The battery must be fully charged.
Check the compression in all cylinders in the same way and compare the obtained values.
After completing the check, screw the spark plugs back into place and connect the wires to them.
Connect the wire to terminal "15" of the ignition coil.
Connect the electrical wires to the injectors.
Diesel engines
Disconnect the electrical wires from the switch at the high-pressure fuel pump to prevent fuel from being supplied to the combustion chambers.
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Remove all glow plugs.
Screw a compression gauge with a flexible connecting hose into place of the spark plug.
Check the compression by turning on the starter for about 4 seconds. The pressure should exceed 20 bar. The difference in values between individual cylinders should not exceed 1.5 bar.
Screw in the glow plugs and tighten them to 25 Nm. Connect the wire to the switch.
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