How to Perform a Compression Test
- Remove one spark plug and make a note of which cylinder it is. ...
- Install the adapter that matches the plug threads into the cylinder head. ...
- The adapter needs to seal to the head. ...
- Crank the engine using the starter. ...
- Read the gauge and take note of the pressure.
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Dec 28, 2012 · A compression test reveals the condition of your engine's valves, its valve seats, and piston rings and whether these parts are wearing evenly.