Gasoline engines
Compression check allows you to draw a conclusion about the condition of the engine. The inspection determines the condition of the valves, pistons and piston rings. You need a compression gauge to check.
Attention! For a diesel engine, a compression gauge with a large measuring range is required (40 bar). The difference between the two maximum compression values must not exceed 1 bar (for a diesel engine - 1.5 bar). If this difference is greater, then this is a sign that the valves are defective, the piston rings, the cylinder mirror are worn out, or the cylinder head gasket is defective. If the wear exceeds the allowable limits, the engine must be repaired or replaced.
The engine must be warm to check compression.
Switch off the ignition. Disconnect the wire from the terminal "15" ignition coils.
Engine with injection system, disconnect all connectors from the injectors to prevent fuel from entering the cylinders.
Disconnect the tips from the spark plugs. For this, it is recommended to use special Hazet 1849 tongs.
Blow out the recesses of the spark plugs in the cylinder head with compressed air and remove the spark plugs.
Turn the crankshaft several times with the starter.
Attention! Set transmission to neutral position. Apply the parking brake.
Screw a compression tester into the spark plug hole.
Instruct an assistant to depress the accelerator pedal and keep it depressed throughout the test.
Turn on the starter as long 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 test, screw the spark plugs into place and connect the wires to them.
Connect wire to terminal "15" ignition coils.
Connect the electrical wires to the injectors.
Diesel engines
Disconnect the electrical wires from the switch at the injection pump to prevent fuel from entering the combustion chambers.
Remove all glow plugs.
In place of the spark plug, screw in a compression gauge with a flexible connecting hose.
Check compression by running the starter for about 4 seconds. The pressure must exceed 20 bar. The difference in values between the individual cylinders must not exceed 1.5 bar.
Screw in glow plugs and tighten to 25 Nm. Connect the wire to the switch.
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