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Hey people, can someone clarify this information regarding the transmission torque values please?
This info is from a 1999 HD factory service manual for Softail Evo.
I get the mounting plate-to-frame bolts, but I'm confused about the first two...
The gearbox case has 4+1 studs bolted into it, and there are 4 lock nuts for these studs that go through the mounting plate: what is the torque value for these nuts? Reading the service manual, my understanding is 20-27Nm (2nd line), but then which ones are the ones mentioned on the first line?
Many thanks
Without being able to read the procedure, I can't help much. However; locking nuts (the kind with the nylon insert) don't have a torque spec. You just tighten them.
Trying to use a torque wrench on crimped style metal locknuts is a waste of time, I'm sure there's a formula around to figure it out but they increase the setting values a good bit and that changes with whether the nuts are new or being reused. I dislike using those as they tend to deform the threads on the bolt or studs used on.
Trying to use a torque wrench on crimped style metal locknuts is a waste of time,
So you are saying every aircraft mechanic out there is wasting his time with a torque wrench...
The oval shape of a locknut adds only a small amount to the torque (as an experimental mech for over 36 years, I have done a lot of tests on this type stuff...).
You measure the run on torque of the nut, add it to the required torque, done.
Last edited by Dan89FLSTC; May 14, 2021 at 12:46 PM.
There is no better way to start an argument than to start talking torque. We went around and around with this at work multiple times. It's very subjective.
There is no better way to start an argument than to start talking torque. We went around and around with this at work multiple times. It's very subjective.
carl
If you aren`t using a torque wrench I guess it could be called subjective........
But if you are using a torque wrench there is nothing subjective about it at all...
Torque is a simple requirement defined in the service manual (or blueprint) of any expensive non throw away machine.
In 44 years as an aircraft mech, I have never had an argument with a single mechanic about torque, unless he wasn`t using a torque wrench...
I have used inch pound torque wrenches that peaked at 10 inch pounds, and have used hydraulic torque wrenches that had a capacity of 50,000 foot pounds.
Not subjective at all.
Last edited by Dan89FLSTC; May 14, 2021 at 05:39 PM.
So you are saying every aircraft mechanic out there is wasting his time with a torque wrench...
The oval shape of a locknut adds only a small amount to the torque (as an experimental mech for over 36 years, I have done a lot of tests on this type stuff...).
You measure the run on torque of the nut, add it to the required torque, done.
It's subjective relating to the topic at hand and it isn't aircraft related, for the untrained user on an old bike yeah it's a waste of time and I'm presently really not in the right mindset to dick measure over this. There's a point when things become too **** over a topic..........
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Transmission mount bolts Torque values...
