Checking the compression in the cylinders (Mitsubishi Pajero 1)

A decrease in compression can be the result of a valve not closing, a broken or worn piston ring, or other damage in the cylinder. To determine which cylinder is the cause of the decrease in compression pressure, in order to avoid false conclusions, a compression test should be performed in all cylinders.

The engine must be warm when checking.

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

2. Insert a compression tester into the first spark plug hole and have an assistant crank the starter by fully depressing the gas pedal.

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

4. Check the compression in the remaining cylinders in the same way.

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

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