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Michaels Sonex #145 log
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Date: 7-3-2015
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Number of Hours: 0.00
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Manual Reference:
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Brief Description: Engine troubles
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Ok, I found out what made the bearing seize.
This is very embarrassing but perhaps others will learn from this so I'll share this anyway.
You can actually see the problem if you look closely at the first picture I took of the bearing earlier.
For those who want a challenge see if you can spot the problem before reading on.
Did you spot it?
No?
Well, here's a hint: what hole got elongated? Is that the dowel pin hole?
Nope, that's the oil feed hole!!!!!!!!!!
My dowel pin was in the wrong hole, blocking oil to the bearing.
That would do it!
When I dropped the crank shaft assembly into the case, the bearing must have rotated out of alignment and the wrong hole lined up with the dowel pin so no oil was making it to the bearing.
I can see that this mistake would be easier to make with the F1 hub/bearing than it would be when using the original bearing like on the AeroVee, because there is also a forward-backward misalignment that would be noticed on the original bearing.
The F1 bearing overhangs this part of the case on both sides so it's a bit harder to spot.
Still, a rookie mistake, very embarrassing and also very costly.
At least I know what happened.
Have to order new parts now, it will be about a month before they get here I think so I'll have to do other things in the meantime, like go on a holiday (leaving tonight).
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