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Leak down test: must engine be cold?

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Old Oct 9, 2022
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Leak down test: must engine be cold?
Will it work to perform a cylinder leak down test while engine is still warm, say after 2 hours of rest after being driven for 30 miles? Or must the engine be cold? Would one give more definitive results than the other?
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Old Oct 9, 2022
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Re: Leak down test: must engine be cold?
Warm engine may show less leaks because of the expansion of metal
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