To add to the list of bolts coming loose the head bolts on the #1 cylinder loosened and a small oil trail was the indication. I consulted with a Rotax engine rebuilder who advised these head bolts need to be checked and he gave me a torque value. Once I re-torqued the #1 cylinder I had no more leaking. I checked the other cylinder heads and the torque was good, and also no leaks.
I used some torque seal ( witness mark) on the visible head bolts and two years later all good and no leaking.
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Patrick Claar
Arvada, CO BJC
RV12, #401, Flying 2013, N612PC
RV6, 1996-2010 sold
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