Re: Stud bolts turning in Crankcase
by Roger Lee » 4 years ago
You do not need to remove the gearbox. Maybe we are talking two different case studs. If it is just turning up on #1 there is another allen head bolt on the top left half of the case. Take a look while you turn the stud it mat be turning. You need to hold that one. You don't need any thread locker. Use the proper torque sequence listed in the SB's
Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell
Re: Stud bolts turning in Crankcase
by Capt. Siva, » 4 years ago
I have checked the crankcase today at my workshop but unfortunately, 914crankcase is different from 912 UL.
see the attached picture, the 914 studs are fixed.
if you show the 912 UL crankcase downside, we can suggest easily the best solutions.?
Re: Stud bolts turning in Crankcase
by Johann Johannsson » 4 years ago
Hello Roger and all.
Just to make things clear, because of language issues, I am sending a photo of the internet (not my engine). The stud on the top right and bottom right of this cylinder, are the problem. When I tried to thighten the rod with cylinder en head on, the bolts and rods were turning without thightening. The hex bolt in the crankcase is turning. Can this be the reason, or are the studs just stretching?
Re: Stud bolts turning in Crankcase
by Capt. Siva, » 4 years ago
Dear Johann Johannsson
until you open the crankcase by removing all cylindersx4, the adjustment /alignment of stud from inside the crankcase is not possible.
as you hold the stud from the backside and adjust/align it.
In this way, if the stud does not aligns/relocate to the original position, the crankcase needs replacement.
its become a major overhauling case.
Re: Stud bolts turning in Crankcase
by Johann Johannsson » 4 years ago
Hello Mr Wang.
Thank you for helping me with this problem. I just do not know why this hex nut is turning inside the housing. That is the mistery, and is a poor design to a very reliable engine. I am waiting for some new studs for the engine and will be replacing them all and will let you know if this will solve the problem.
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