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Oil Leak

 
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DCS317(at)aol.com
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PostPosted: Sun Jan 22, 2006 4:14 pm    Post subject: Oil Leak Reply with quote

I've got an small oil leak on the back side of my Lycoming. I thought it
was leaking around the lower stud of the left magneto (a drip forms on that
stud). Two removals and reinsertion of the stud (each with thread cleaning and
thread sealer coating) and then a third removal (with an oversized stud
inserted) did not cure the small leak. I think the leak is probably above the
magneto perhaps at the connection of one of those expensive oil hoses at the back
of the case. Just running the engine for a few minutes will not cause the
leak--I have to cowl it up and fly the bird to see any oil leak, i.e., high
power settings for at least 20 minutes--which messes up my belly and diffusely
the left back of the engine. I've tightened all connections to the oil
cooler (located on the right side of the engine) and cannot pinpoint any area of
leakage. This is small enough to not notice any significant reduction in
crankcase oil level even after a few flights. Anyone got any ideas how to
pinpoint this frustrating leak?

Don Schmiesing
Seattle
110 hours on RV-8 417DS


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jollyd(at)ipns.com
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PostPosted: Sun Jan 22, 2006 7:14 pm    Post subject: Oil Leak Reply with quote

here is a tip that works for me on a LOT of stubborn leaks on ALL sorts of
engines..clean the engine, and dry it off..put a coating of talk powder over
the suspected aerea of the engine..if no joy after you run the engine, try
putting talk ALL OVER the engine..sometimes the air stream carries the oil
to the back of the engine, when the leak is really in the front...good luck,
and blue skys to you...jolly in dallas, ore.
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lenleg(at)aol.com
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PostPosted: Tue Jan 24, 2006 1:28 pm    Post subject: Oil Leak Reply with quote

Don't know if you have a CS prop but if you do ... check the governor ... that is where I had a leak.

Len Leggette, RV-8A
Greensboro, NC N910LL
429 hrs


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mannanj(at)alltel.net
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PostPosted: Tue Jan 24, 2006 5:19 pm    Post subject: Oil Leak Reply with quote

If your engine happens to have a single drive dual mag setup ("Siamese
mags"), there's a Service Instruction, Lycoming
SI # 1438A that addresses oil leaks between the prop govenor and the
accessory case. Seems some prop gov. shafts are a bit too long and bottom
out in the internal gear, not allowing the gov. to be tightened down enough
to compress the gasket.

Mannan Thomason
RV-8 Light at the end of the tunnel!
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