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Chasing oil leaks

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andrew.p.sanders(at)boein
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Posted: Mon Mar 26, 2007 8:48 pm Post subject: Chasing oil leaks

We have a O-360-A1A that was spewing about a quart of oil an hour.  



So far we've taken care of the leak past the prop o-ring at the crank

nose, sealed a big leak at the case parting surface at the front of the

engine, fixed the flare at the head end of the oil drain back tube at #3

and replace the drain back hoses on #'s 2 and 4.



We're down to getting seepage from the case end of the exhaust pushrod

tube on #2, both ends of both tubes on #4.  The other five seem "tight".

That is they don't easily move while the leaking ones have both a small

amount of play between the head and case and can be rotated in their

seals.  With the pushrod tubes  being retained by the spring

clip/retainer at the head end, there doesn't seem to be any way to

increase the preload against the base seal.  



What are the tricks to getting the tubes to seal?



Thanks,

Andrew

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