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How to check compression pressures in cylinders

A compression test can provide informations on an engine's condition

Compression test is carried out on an engine warned-up to normal running temperature

You need a compression tester to measure pressure in cylinders

Choose your compression tester according to your engine model (petrol or diesel)

0 to 20 bars for a petrol engine

This compression tester is intended for diesel engines

It contains adapters which can be screwed into the glow plugs or injectors holes

If you choose an adapter suitable for use in the glow plugs holes, choose the adapter adapted to your glow plugs

On diesel engines, disconnect the stop solenoid to cut the fuel supply during the test On petrol engines, unplug the ignition coil's connector and disable the fuel pump (by removing the appropriate fuse for example)

Isolate the stop solenoid wire to avoid short-circuit with an earthed component during the test

Remove the glow plugs feed wire

Isolate the glow plugs feed wire

Remove the glow plugs

Screw the compression tester adapter in the glow plugs holes

On petrol engines, hold the accelerator pedal down while cranking the engine during 5 seconds

On diesel engines, crank the engine during 5 seconds (you don't need to press the accelerator pedal)

Compression pressure in cylinder n°1 = 30 bars

Release the pressure before disconnecting the compression tester



If the access to the glow plug hole is limited, use a bent adapter

If the pressure doesn't build-up, try to apply grease in the compression tester adapterThe pressures in the cylinders must be very similar

Compression variation between the highest and lowest readings should be less than 10%

A low pressure in a cylinder indicates worn valve heads or piston rings

A low pressure in 2 adjacent cylinders is often due to a leaking head gasket between the 2 cylinders

A high pressure in a cylinder indicates the presence of carbon deposits in the combustion chamber and piston

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