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airsix's Avatar
 
Join Date: Feb 2002
Location: Washington State
Posts: 35
Assessing condition - before teardown

Can an accurate comrpession check be done on an engine while on a stand, being spun by hand? (or doesn it have to be spun faster - by a starter?)

I'm trying to assess the condition of a recently purchased motor and don't want to tear it down if it isn't necessary.

Suggestions much appreciated. Thanks in advance.

-Ben M.

Old 08-24-2003, 09:00 AM
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Join Date: Feb 2002
Location: Washington State
Posts: 35
Ok, while waiting I went and read up on leakdown tests. I was surprised at the simplicity - always figured it would be complicated. So, I'll do a leakdown test this week and report back (if anyone is interested).
-Ben M.
Old 08-24-2003, 07:21 PM
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Join Date: Feb 2003
Location: So California
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Answer to first question. NO you cannot do a compression check without a starter. A leakdown test, yes, but remember you are not at operating temp so something may be a little off, but NOT al whole lot. If your leakdowns are under 35% I would suspect everythings good. You can determine if the leakage is valve, rings. If its valve, do a valve job, if its rings, and under 35% I would wait and run it for a while.
Old 08-24-2003, 08:50 PM
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