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Oil leak around oil pick up line


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With the dye, I would start with a 2 minute ground run.  That is all it took to find mine.  After a lot of this and that and changing this and that, 2 minute run with the dye solved the issue.

 

Oil Leak.jpg

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15 hours ago, MikeOH said:

Also, I believe the crush washer needs to be installed with the split side against the oil sump.  That's my recollection; you should verify!

Thanks, I should have mentioned that. 
httpswww.lycoming.comsitesdefaultfilesattachmentsSSP-1776-52520Table2520of2520Limits2520-2520Complete_pdf.png.396101eef2ba84e965625688bd6b57c3.png

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So here's an update. Flew the plane to Toronto on Thursday and my mechanic had a good look at it. He cleaned the engine bay then sprayed some developer on the rear.

It's not apparent that the leak is coming from the prop governor. As seen in the picture.IMG_8310.JPG.578c81957f42289fa2953adb67b8e509.JPGIMG_8312.JPG.50c8e8a585c0a5d9de1dd92965baec36.JPG

The leak doesn't occur unless the power is above 20 inch manifold pressure and prop is pulled back slightly, so that's why the previous ground run did not identify any leaks.

 I read on this thread and it seems it is a common occurance on dual mag engines. But it seems in my case the spacer is there, but the second gasket is missing. The first gasket between the spacer and the engine is clearly visible but it seems the spacer is in direct contact with the prop governor and we can't see any gasket in between. Has anyone seen this before?

My mechanic tried to tightened the bolt but the space it too tight back there. So i have to leave the plane with him and he's going to remove the governor and reinstall it properly.

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3 hours ago, Shiroyuki said:

So here's an update. Flew the plane to Toronto on Thursday and my mechanic had a good look at it. He cleaned the engine bay then sprayed some developer on the rear.

It's not apparent that the leak is coming from the prop governor. As seen in the picture.IMG_8310.JPG.578c81957f42289fa2953adb67b8e509.JPGIMG_8312.JPG.50c8e8a585c0a5d9de1dd92965baec36.JPG

The leak doesn't occur unless the power is above 20 inch manifold pressure and prop is pulled back slightly, so that's why the previous ground run did not identify any leaks.

 I read on this thread and it seems it is a common occurance on dual mag engines. But it seems in my case the spacer is there, but the second gasket is missing. The first gasket between the spacer and the engine is clearly visible but it seems the spacer is in direct contact with the prop governor and we can't see any gasket in between. Has anyone seen this before?

My mechanic tried to tightened the bolt but the space it too tight back there. So i have to leave the plane with him and he's going to remove the governor and reinstall it properly.

That'll do it.   Glad you got it sorted.   I forget about the spacer/gasket sandwich back there until it comes up like this again, which it seems to once in a while.

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4 hours ago, Slick Nick said:

Glad you found the source. How much oil did you lose getting it to Toronto? Who was the last shop to have the governor off and not put the spacer back in?

About a quart ish.

The shop that last touched the prop governor was the shop that installed the engine after it was overhauled. It has since went out of business as far as I know. I've never worked with them personally but the previous owner seems to like them.

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  • 2 weeks later...

I’ve got another update.

My mechanic sent me this picture earlier today, showing the two gasket are mounted together without the spacer PN LW12347, which is exactly what Mooney SB 120 was talking about, and that previous thread mentioned. This is outrageously incompetent from the mechanic that installed this engine. It could’ve very well caused a crash, and it had happened before (N11385).

I’m going to report this occurrence to transport canada, and meanwhile I’ve order the spacer and hopefully it will arrive soon.

IMG_0523.jpeg

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