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Should allow you to quickly determine, the basic condition of any engine A cylinder leak down test, can tell you if the loss of compression is from, worn rings, burned or stuck open valves or a leaking head gasket. So, a compression test is a dynamic test (engine moving)
On the other hand, a cylinder leak down test is a static test (engine at rest) Find out how to troubleshoot cylinder leakage problems and identify the source of the leak. Hi use freshly changed oil , drive vehicle and do leak down test within the hour ,, just not stone cold
You can smoke test the engine or simply push some compressed air into it through the vacuum gauge fitting and listen for leaks or view the smoke if your using a smoke tester.
What is a leak down test A leak down test is a method of using compressed air and a specialized gauge set that reads differential pressure to evaluate the condition of an engine's cylinders, pistons and rings, and valves and seats without disassembling the engine. What kind of results should i be looking for I'm about to go out and check compression in all of my cylinders before i move on with my turbo plans
What sort of readings should i be looking for What's good and what's bad When i do a leakdown on a race engine and get a low number, i tap the valve and listen for the air release The leak down test showed 20% leakage, which was a bit higher than i was expecting
I tore the head back off and cleaned the valves and seats with brakleen before putting it back together and trying again
Still leaked around that one valve though. Compression and leak down tests are simple diagnostic tools, but do not test sealing/dynamics under full load There are other considerations which will cause oil consumption and/or loss of compression under full load Last edited by joe c.
April 16, 2010, 08:26 pm.
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