Questions tagged [compression-testing]

Compression testing is the act of testing the air pressure generated by a cylinder in an internal combustion engine.

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Blown head gasket? (Decent compression numbers but cooling system doesn't hold pressure, no external leak)

I have a Mazda MX-5 and it was overheated due to the water pump belt failure. I replaced the belt afterwards and the car drove fine. I brought the car to the shop and they told me it has head gasket ...
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Help me understand the results of these cylinder compression and leakdown tests

I recently purchased a 2007 Subaru Outback 2.5i, with approx 146000kms on the clock. As its a recent purchase, I'm going through preventative maintenance to ensure its running as good as possible. ...
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