Why a cylinder leakage test should be performed if a compression test reveals low readings on cylinders. Leak down tests are performed to measure the percentage of compression lost.
They help to locate the source of the leak. Even if the answer is bad news it's helpful information. Using specialized tools gives you the ability to pinpoint the problem area before you start tearing down the engine. It can also help you determine if the repairs are worth while on high mileage engines.
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