New cylinder head torque procedure

by Guy Sirois in 912 / 914 Technical Questions 7 years ago

I'm looking at SI-912-025 which is the "Change of tightening torque procedure for the cylinder heads", and on page 5 I'm perplexed by the mention to tighten nuts to 265 in. lb. (-44 in. lb.)
Is the (-44 in. lb.) a tolerance value, meaning +0 -44 , or something else?
Thanks!

Re: New cylinder head torque procedure

by Roger Lee » 7 years ago

Roger Lee

131 5.38k 5.44k

Hi Guy,

Watch this video.

https://www.rotax-owner.com/en/videos-topmenu/expanded-video-instructions/463-new-torque

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: New cylinder head torque procedure

by Guy Sirois » 7 years ago

Guy Sirois

2 10 0

Thanks roger, I knew about the video, but as I'm not presently a subscriber, I couldn't view it.
I really just wanted to know if this is a tolerance spec where they omitted the +o, and specified only the minimum value.

Guy

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Re: New cylinder head torque procedure

by Charles Lewis » 7 years ago

Charles Lewis

0 2 0

Guy, I had to reread the instruction specs after watching the Video and the (-44in lb) notation appears to be an initial tightening torque value used to snug the heads in preparation for " intake manifold alignment" of the 2 heads. That is certainly not clearly stated in the instruction. Once the heads are aligned, then you apply final torque and additional rotation as specified.

Thank you said by: Guy Sirois, Wayne Fowler

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