As the engine mileage increases, the compression decreases. When the wear limit is reached, the engine must be replaced or overhauled. The difference in compression between individual cylinders depends on the power of the engine. The following values must not be exceeded: motors DF, DG, DJ, MV, GW, SS max. 3 bar, EY motor max. 2 bar. Exceeding these values is a sign of defective valves, wear of piston rings or working surfaces of cylinders.
Attention: When checking compression, disconnect the ignition wire (terminal 4) from the ignition distributor cover, extend with a suitable wire and connect to the vehicle ground. Observe safety precautions when working with the TSZ system.
Warm up the engine to check compression. Unscrew into the spark plugs, in accordance with the operating instructions, connect the pressure gauge to the spark plug hole.
Have an assistant depress the gas pedal all the way down and keep your foot on the pedal throughout the test.
Let the starter run for about 5 seconds. Take a reading from the manometer.
Check all cylinders in sequence and compare the results with the specified value.
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