See Figures 1 through 11
Checking cylinder compression on diesel engines is basically the same procedure as on gasoline engines except for the following:
- A special compression gauge adaptor suitable for diesel engines (because these engines have much greater compression pressures) must be used.
- Remove the injector tubes and remove the injectors from each cylinder.
Don't forget to remove the washer underneath each injector; otherwise, it may get lost when the engine is cranked.
- When fitting the compression gauge adaptor to the cylinder head, make sure the bleeder of the gauge (if equipped) is closed.
- When reinstalling the injector assemblies, install new washers underneath each injector.
The conventional compression gauges that are used for gasoline and diesel engines are not suitable for use on a rotary engine as they only measure the highest pressure of the three combustion chambers in the rotor housing. To accurately determine compression pressure on rotary engines, a special electronic compression tester (49-F018-9A0) is required. This piece of test equipment reads the compression of all three combustion chambers.