Zenith Aircraft Builders and Flyers
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Engine Bolt Torque
Hi building a 701, torquing the engine mount bolts to 37 ft lbs deformed the distance tube and gouged the cup washer.
I found it difficult to even hold the wrench smoothly at 37, is that the torque others use?
I know the bolt needs tension to avoid fatigue but the 701 and Rotax are so light and the tubes are so thin.
Replies to This Discussion
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Permalink Reply by Jim and Amelia Isaacs on
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Shaun a picture would help. Are you talking about the bolts that attach the engine ring mount to the firewall mount through the rubber vibration isolators?
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I confess I did not tighten mine with a torque wrench. Instead I snugged them until the rubber bushings started to compress, then tightened them with just enough additional force to align the next available cotter key slots.
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I relooked the instructions and notice they depict SL nuts- my kit came with castellated nuts and cotter pins- are you accounting for the drag torque of the SL nuts when you tighten?
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