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Michaels Sonex #145 log
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Date: 7-1-2015
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Number of Hours: 2.00
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Manual Reference:
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Brief Description: Engine troubles
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It took me some days to find the courage to post this, it still hurts looking back, but here goes.
I’ve had another serious problem with my VW engine, this weekend I started the thing for the first time and it ran really rough.
I was not able to get any power at all out of it so I took the plane back into my garage to investigate. Anyway, here’s a short video:
https://www.dropbox.com/s/1jsdsm4f0d6qyf8/MOV_0100.mp4?dl=0
(This is a link to my dropbox so this won’t be on there forever, download a copy if you want to keep it for reference).
Unfortunately, that was the good news.
The bad news however is that after this I had damage, my Force One prop hub bearing had spun. It was moving along with the crank.
I couldn’t believe it, I have to rebuild this engine a second time now (others may have followed my previous incident on the VW aircraft forum).
Nothing I can do about, I took the engine off the plane and opened it up, dreading to find out what damage was done inside.
Anyway, the pictures show what it looks like, the F1 hub & bearing are toast, the case also took damage at the dowel pin insert. Everything else appears to be intact.
How could this have happened, was the rough running (possible timing issue) the cause? Did the bearing get such a nasty kick it got smashed out of its seating?
I contacted Scott at Hummel engines and he seems to think it would rather be either an oil delivery problem to the F1 bearing or the bearing was just too tight, I’ll need to investigate.
I’m also talking Marty at Great Plains.
Scott seemed to think the case could perhaps be salvaged by machining out the dowel pin hole and use a “stepped” dowel pin (larger on one side) instead. A machine shop can make one if necessary.
However, I’ve taken the case to the local engineering shop and they think there is too much damage, the hole would have to be enlarged so far that there would not be enough wall thickness left on the aft side.
I guess I’ll need an new engine case (again!).
As said the F1 hub and bearing
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