Proper torque for float bowl retaining screw

by Greg Stowell in 912 / 914 Technical Questions 6 years ago

I had my plane get a 100 hour service recently and the engine is stumbling at full power. The shop that did the work said I should retighten the float bowl screw to 35 in. lbs. I noticed on the rotax owner video, that the recommendation is 48 lbs. inch. Has this 48 inch been updated to 35? Or am I mixing different numbers?

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Re: Proper torque for float bowl retaining screw

by Rob Seaton » 6 years ago

Rob Seaton

3 1.32k 240

the correct torque is 5.5 nm (approx 49 inch lbs)
See Heavy Maint manual ch 73-00-00 sec 3.3.7

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Re: Proper torque for float bowl retaining screw

by Greg Stowell » 6 years ago

Greg Stowell

6 20 5

Thank you Rob. I checked back in with the Rotax shop, and what I'm hearing from them is that the spec has changed to 35. But I haven't seen that in any bulletins.

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Re: Proper torque for float bowl retaining screw

by Charles Lewis » 6 years ago

Charles Lewis

0 2 0

Side note: I found out the hard way that over-tightening the 914 carb bowl retaining nuts can deform the bottom of the bowl ever so slightly, causing float guide rods inside to splay outward and create a float binding situation. The clearance between side wall and floats is very tight. End result is float bowl overfilling leading to raw fuel entering the intakes and cylinders. Lesson learned.

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Proper torque for float bowl retaining screw

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