Crankshaft locking Bolt torque

by JD Wade in 912 / 914 Technical Questions 13 years ago

I checked the gearbox clutch friction and had written to torque the bolt (not the locking bolt) to 22 ft-lbs on notes I took during your Video. When I checked the Rotax Line Manual, it gave a torque of 15 Nm, which would be about 11 ft-lbs. What is the correct torque for this bolt? Thanks

Re: Crankshaft locking Bolt torque

by Ted Norris » 13 years ago

Ted Norris

22 47 0

I don't think there is a torque for the locking bolt, it go into a hole on a counter weight and positively stops rotation, just bottom it out and sung it up.

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Re: Crankshaft locking Bolt torque

by bill martin » 13 years ago

bill martin

10 757 0

torque value for the locking bolt is 10nm.

Bill.

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Re: Crankshaft locking Bolt torque

by JD Wade » 13 years ago

JD Wade

2 6 0

I am sorry, apparently I was not clear. Not the locking pin, but what is the correct torque for the crankshaft plug screw M8 X 20. The screw that stays in the engine while it is running. The Rotax-Owner video specified 22 ft-lbs. I found in a Rotax manual a torque value of 15 Nm which is 11 ft-lbs or half the torque specified in the video.

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Re: Crankshaft locking Bolt torque

by bill martin » 13 years ago

bill martin

10 757 0

JD,

Since you have two different torque values for the same bolt, the low value would be wet torque and the high value would be dry torque.

the 22ft/lbs is dry torque. Wet torque would be considerably less. Since that bolt and the bolt hole are usually oil soaked, you would use the lower wet torque value.

If you dry torque an oil soaked bolt or bolt hole, you can strip the threads.

Bill.

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Crankshaft locking Bolt torque

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