Cylinder compression check

Compression loss can be the result of a valve that won't close, a broken or worn piston ring, or other damage to the cylinder. To determine which cylinder is causing the reduction in compression pressure, a compression test should be performed on all cylinders to avoid false conclusions.

The engine must be warm when checking.

1. Remove the glow plugs. In addition, it is required to remove the injection pipes from the injectors.

2. Insert a compression tester into the first spark plug hole and have an assistant start the starter by pressing the gas pedal all the way down.

3. Turn the engine until the maximum value on the instrument scale is reached. Press the button on the instrument to prepare the instrument for measurement on another cylinder.

4. In the same way check up a compression in other cylinders.

5. None of the cylinders should have a compression that is less than 80% of the maximum measured value. The decrease and different compression values in the cylinders can be attributed to worn piston rings, which should be accompanied by increased oil consumption at the same time.

6. During normal operation of the cylinders, the compression should be 27.0 bar. Wear limit - 24.0 bar. The maximum difference between the individual cylinders is 3.0 bar.