Free PDF guide
Compression and Cylinder Leak-Down Test
How to run the tests, which values are normal and how to tell rings, valves or head gasket apart.
- 5-page PDF, ready to print or read on your phone
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- Available in English and Spanish
Measure before you open an engine. This guide explains the compression test step by step, the 10 % rule to know whether a cylinder is fine and the wet test that separates rings from valves.
It includes charts of six typical results, the leak-down table by where the air escapes and quick vacuum gauge readings to spot retarded timing, burnt valves or a restricted exhaust.
What the guide covers
- How to do a compression test
- Guide values and the 10 % rule
- What the numbers say: 6 cases with charts
- Wet test
- Leak-down test: where the air escapes
- Quick vacuum gauge readings
