Torque Values

[Chuck Irby]

Due to getting different torque values from different sources, would someone please provide me with the proper torque values (or reliable sources) for:

1. The eleven bolts that hold the "C" Box cover in place.
2. The six 5/16" bolts that hold a Warp drive prop to the prop shaft flange.
3. The 1/4" bolts that hold the Warp Drive blades in place.

My sincere thanks,
Chuck

[ToddP]

Chuck,

I found this information:

Rotax C - Box Torque Value for the 11 Bolts - 90 in./lbs.

http://www.ultralightnews.ca/cdrive/9UL94.pdf

From Warp Drive at: http://www.warpdriveprops.com/protractor.html

Propeller Bolt Torque Values--All Standard, HP and HPL hubs that use 1/4" bolts to clamp the blades in the hub should be tightened to 120 inch pounds. All Rotax bolt patterns that use 8 mm bolts to clamp the blades in the hub should be tightened to 175 inch pounds. All Standard, Hp and HPL hubs that use 3/8" bolts to clamp the blades should be tightened to 35 foot pounds. Warp Drive propeller installations on direct-drive aircraft engines and other engines used on airboats must tighten the 5/16" clamping bolts to 200 inch pounds and tighten the 1/2" flange mounting bolts to 60 foot pounds. Adherence to these torque values is imperative for reasons of safety.

[Chuck Irby]

Todd,

I appreciate you coming up with this info for me, I too had found the info from Warp Drive since I entered the request on the forum.

However, the C box cover is a different situation. I don't remember where I found the torque value, but after installing a clutch in the gear box, I very meticulously removed the old and installed a new gasket, then torqued the bolts in proper sequence to 120 inch pounds. It leaked. Someone then told me I should have torqued them to 12 foot pounds. I tried that and striped the threads out of the gear box with the first bolt. I'm glad it was above the top drain hole. I guess I'll have to install a heli coil now. Meanwhile, I am still flying

Thanks again Todd,

Chuck