How do you torque a nut to 350 ft.lbs?

[ishiboo]

So your suggesting Tampa and the girls join in too eh.

I think Tampa and one girl would be plenty, no?

 

[Raymond Fast]

Get one of these Harbor Freight torque multipliers and use it with your 300 ft-lb torque wrench.

 

[Moose-LandTran]

I guess you just hope the bar is sort of close to level when it reaches fully torqued.

Use a bar and a spring balance. Pull on the spring balance, as long as you pull in the direction of rotation it will be accurate.

All pretty simple.

Or just buy a big 3/4" torque wrench. I mean, who doesn't want a 4'-long torque wrench?

 

[RPH]

We build bolt heating systems used at the power plants. The 3" bolts that hold the covers in the turbine are torqued to 10,000 foot pounds. To loosen them the place a inductor into a hole down the center and turn on the high frequency current. Using a dail indicator they watch the bolt grow and then start to loosen them. How they tighten them I have no idea as I haven't been involved in that end. Someday maybe.

 

[owenst7]

Funny, I've just had to do this today for the pinion nut on my truck's 14 bolt axle. I also have a 600 ft-lb, 3/4 drive torque wrench. I think I paid $65 for mine at a swap meet.

Yeah, it's about this long...

Why did you use a torque wrench? 14 bolts have a crush sleeve.

My CDI 3/4" torque wrench reads to 600 ft lbs. Got it for doing D60 kingpins. Would be better to not use it right at its limits, but this was a good deal used and I don't use it frequently enough to justify spending $500+ on something else.

 

[Wes J]

We build bolt heating systems used at the power plants. The 3" bolts that hold the covers in the turbine are torqued to 10,000 foot pounds. To loosen them the place a inductor into a hole down the center and turn on the high frequency current. Using a dail indicator they watch the bolt grow and then start to loosen them. How they tighten them I have no idea as I haven't been involved in that end. Someday maybe.

I've seen this done with steam. The bolts have a NPT port and you hook up a steam line and let them heat up. Since the turbine housing is cool and only the bolt gets hot, they expand and are easy to take apart.

There are hydraulic torque wrenches that go to ungodly amounts of torque.

 

[Schurkey]

Stop looking at HF torque wrenches.

My Proto goes to 600 ft-lbs http://www.tacomascrew.com/Proto-6020AB-Foot-Pound-Torque-Wrenches

I've never seen a 3/4 torque wrench that wouldn't go to 600 ft/lbs. I used to torque the nut that held the yoke at the back of a bus transmission. 600 ft/lbs--the limit of the torque wrench--was what that fastener got. I think it was supposed to be more than that, but the bus company wouldn't buy a bigger wrench.

Why did you use a torque wrench? 14 bolts have a crush sleeve.

What difference does that make? Crush sleeves don't change the torque. Torque sets bearing preload, not crush.

 

[DonPowers]

One of these.

 

[owenst7]

I've never seen a 3/4 torque wrench that wouldn't go to 600 ft/lbs. I used to torque the nut that held the yoke at the back of a bus transmission. 600 ft/lbs--the limit of the torque wrench--was what that fastener got. I think it was supposed to be more than that, but the bus company wouldn't buy a bigger wrench.


What difference does that make? Crush sleeves don't change the torque. Torque sets bearing preload, not crush.

There is no torque spec for a 14 bolt pinion nut, so I was curious why he "had to" use a torque wrench.

If you really want to argue semantics, technically the crush sleeve sets bearing preload via yield strength.

 

[TNToy]

3.2 blips of your 400 ft/lb impact after it has taken the slack out of the pinion nut or similar item... combined with "I do it by feel."

'tis the flat-rate way.

 

[kunkernator]

I have 3 3/4'' torque wrenches. All go to 600 ft lbs, a Proto, CDI, and a PI. I especially like the PI because it disassembles in to a nice carrying case. All 3 US made.

 

[ultgar]

There are hydraulic torque wrenches that go to ungodly amounts of torque.

The Hytorc Avanti goes to 138,000 ft lbs. SD