An engine compression test kit consists of a pressure gauge and an assortment of hoses and fittings so that the gauge can be connected to the spark plug holes on each of an engine's cylinders. To ...

To determine whether pressure's escaping from the engine, you need to check the compression in the cylinders. For this job, you need a compression gauge (see Figure 8-9).

We walk you through a compression test, a great way to determine the condition of your valves and piston rings.

An engine’s cranking compression numbers provide a good indication of its ability to run on pump gas without detonation.