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Re: Acceptable compression NOT the leakdown method?
by bill martin » 13 years ago
Al,
If you are getting 130-140psi with a standard compression test, You are OK. I usually do a standard check by removing one plug from all four cylinders so the engine will really wind up in a hurry with the starter (mags off).
If your engine is running OK with no problems, a standard compression check is all you need. I do a leakdown check at annual time only, or whenever I suspect a problem. A leakdown test is great for pinpointing where a problem is, but is no better than a standard test for just checking compression.
Bill.
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Re: Acceptable compression NOT the leakdown method?
by bill martin » 13 years ago
Al,
You got my curiosity up and I found what you need.
Go to the line maintenance manual, section 12-20-00, page fifteen, part 5.1. It gives you all the numbers for a standard compression check.
Bill.
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Re: Acceptable compression NOT the leakdown method?
by Michael Rand » 3 years ago
This is my belief also Bill. I think that the leak-down test is the right tool for diagnosing abnormal straight compression tests.
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Re: Acceptable compression NOT the leakdown method?
by Rotax-Owner » 3 years ago
Direct Compression Check - https://www.rotax-owner.com/en/videos-topmenu/elearning-videos/183-direct105
Differential Compression Check - https://www.rotax-owner.com/en/videos-topmenu/elearning-videos/181-diff
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