Quote:
Originally Posted by Ronnieroadster
A leak down tester is the only way to truly know what the engines internal condition is. Using the leak down tester you can easily determine the condition of the piston rings and easily determine how well the intake valve is seating and how well the exhaust valve is seating.
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I don't know that I'd agree with this necessarily, a compression test is kind of a "first cut" kind of thing. A leak down test is certainly indicated if or when it fails a compression test, to help narrow the exact cause down.