Why I haven't been on here too much

mshunter said:
Sounds unlikely that they bored it to small. It's been bored oversize. Probably gave you the wrong cam bearings. Did they tell you what size over they went with the case, if they did at all?
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No cam bearings on a Lycoming-it just rides in the case. The case halves were cut down to get rid of some fretting at the middle main bearing saddle, I hypothesize that the cam bearings were not properly line-bored after that. Or something. I dunno. Gotta talk to the case shop today I guess.
 
Roger Roger said:
No cam bearings on a Lycoming-it just rides in the case. The case halves were cut down to get rid of some fretting at the middle main bearing saddle, I hypothesize that the cam bearings were not properly line-bored after that. Or something. I dunno. Gotta talk to the case shop today I guess.
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Well that makes sense then. Dremel? (only kidding) Sounds like someone machined the case halves, and didn't machine the cam bores. Did the plastigauge turn out right for the crank?
 
mshunter said:
Well that makes sense then. Dremel? (only kidding) Sounds like someone machined the case halves, and didn't machine the cam bores. Did the plastigauge turn out right for the crank?
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Didnt use plastigauge, Lycoming for whatever reason doesn't recommend it, but the micrometer measurements on the crank bearings were good-just didn't even think to check the cam bearings because hey, theres no insert to deal with and it's a brand new cam so should be good to go right? Guess not...
 
Problem found. Reamer didn't quiiiite make it through the middle cam bearing, leaving a tiny ( <.010") lip on one half of the case. Can buff it out and be good to go. Apparently it's not unheard of on this particular model of case, which would have been nice to know beforehand.
 
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Looks like it belongs in a helicopter sitting there like that.

Well, maybe an upside-down helicopter? :ooh:
 
I'm guessing you use an engine hoist to haul the sucker upright to bolt it to the airplane?
 
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