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Heads Up!

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

I had a head bolt come out in flight on a 912 ULS and destroyed my engine. Check the torque on these bolts and save yourself $20,000.

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Re: Heads Up!

by Roger Lee » 6 years ago

Roger Lee

126 5.14k 4.58k

Hi Norvel,

What bolt?

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

Top-Left Cyl # 2. It was sticking out over 1 inch. I had been having problems with the idle for a while so I don't think it came out all at once. Inflight smelled hot, cyl head temp pegged, power reduced to 45%. Engine destroyed but got back to the airport safely.

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Re: Heads Up!

by BROTAX » 6 years ago

BROTAX

0 21 11

This particular bolt/nut coming loose is an indication that this engine was overheated. The overheat caused the head to loose it's hardness and the torque of this nut to lower. Did you have any history of high CHTs?

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Re: Heads Up!

by Norvel Swallie » 6 years ago

Norvel Swallie

23 37 73

Temperature tape on many components was all within tolerance. No history of overheating.

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Re: Heads Up!

by Norvel Swallie » 6 years ago

Norvel Swallie

23 37 73

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?

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