Minor leaks - oil return lines

Minor leaks - oil return lines

I have a 1980 172N and have a minor amount of oil spread on inside bottom cowl after 2-3 hrs. operation. I suspect leak at hoses that couple the return tubes from heads to sump. Is this a common problem?

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Re: Minor leaks - oil return lines

I found a fitting loose--the blue colored nut that attaches the return line under the cyl.  Oil was leaking like crazy around this nut and making a real mess but the A&P never suspected it....he thought it was all coming from the top of the case halves seal.  While looking at it with him, I reached over and turned the nut with my hand--just a lucky hit on my part.  He immediately took his wrench and tightened the nut and said  "well that's fixed".   Jeez...it cost me about $150 to fix that leak and I'M the one who had to diagnose it !!!  I don't use that guy any longer!

So---check ALL those "blue nuts" for leaks (they may not be blue on your engine).

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