Heads Up!

by Norvel Swallie in 912 / 914 Technical Questions 6 years ago

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Re: Heads Up!

by Roger Lee » 6 years ago

Roger Lee

126 5.13k 4.55k

However, flying in the Las Vegas area it is not unusual to encounter 110 to 115 degrees during the summer. Would that cause the bolt to lose torque?

Hi Norvel,
The OAT should not be the cause. I live in Arizona with those temps and many live in the SW US with high OAT's and never have an issue. Either the engine had been over heated or the bolt/nut was not tight enough to start. I seriously doubt it left the factor this way because they run all the engines and check everything.

The temp strips were most likely on other components and not on this head. This head could have overheated and yet a temp strip on an ignition module or a VR would have been normal.

I think more diagnostics are in order.

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

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Re: Heads Up!

by Norvel Swallie » 6 years ago

Norvel Swallie

23 37 73

The engine had over 1400 hours and I put the last 600 on it. As far as I know, the heads have never been off. Just saying!

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Re: Heads Up!

by Alex Morrison » 6 years ago

Alex Morrison

21 46 62

Hi. Related to this thread I have seen a 912UL engine today whose cylinder #1 top left head bolt/ stud only has a couple of threads showing beyond the nut whereas all others on the engine have at least double that. The engine has only 230hrs and has no record of the head ever having been taken off for servicing. It is a new aircraft to the owner and had not yet been started up after having been sat unused in a hangar for over a year. I would like to check the torque as it looks odd compared to the rest but am unsure of what torque to set for without going through the whole new replacement head bolt torque sequence. Would you have any advice? Thanks

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