A BOLT TORQUE QUESTION

[guido]

Hello,

The torque and turn method usually will give a torque value and then turning the bolt say 30 degrees. With a six sided bolt you would use one of the sides for reference. Suppose the turning spec is for 35 degrees? How do you do that!. I never encountered that spec. just curious!

Guido.

 

[Welding man]

Torque angle guage or I have a programable torque wrench that beeps when the proper angle is reached

 

[guido]

Hello welding man,

I don't have a programmable torque wrench, I do have one of those!
There is a right way to torque fasteners!
Have a nice day...................

Guido.

 

[T in NE]

Guy I work with used to work for Cat. Was putting a head on a C13, book said to torque then 90 degrees. Back them all off, re-torque to a higher number, then another 90 degrees.

He asked how he was supposed to get the 90 degrees.

First one, 3/4" impact. Second torque, 1" impact, or the 3/4 will do it if you wait til the compressor kicks off before doing the next one.

 

[Anonymous-0]

Track bolts on crawlers call for a certain torque then 1/3 to 1/2 turn more depending. The most common way to measure the extra turn is to make a mark with a felt pen or marker on the bolt head or socket.

 

[guido]

Hello Stick welding,

My point was that there is only one way to torque fasteners. Some areas are more forgiven then others. But torque values are given for a reason, and are not subject to interpretation,

Guido.

 

[guido]

Hello T in NE,

I had a guy at work that torque everything to the max. One time he tighten an oil filter on a 3176 so tight, that it blew the gasket out on the first run. It took tow guys with extensions and a lot of pulling to get that filter out!
Lucky for him the engine was saved by the driver,

Guido.

 

[T in NE]

He was going by the Caterpillar spec, not just SWAGgin it. That's what it took to do the job.

 

[sheiserman]

There's more than one way to torque fasteners.

I don't understand torqueing to a given point, then turning some more. I know there are different applications for any given bolt or stud, but we arrive at our final torque by the size of stud being used. An 1 1/4 B7 stud has a final setting of 695 ft.lbs (IIRC). We do a pass at 30%, then 60%, and then the final torque value. We toyed around with bolt/stud tensioning, but didn't go that route.

No matter the standard being used, if more than one person is doing any torquing, there are going to be variances. All quality control can do is make sure all equipment is calibrated, and that conscientious people are using it.

 

[guido]

Hello sheiserman,

Just follow the recommended torque and sequence. Worry about the quality of the rest of the work.
One torque job is for one person......... period!

Guido.

 

[ASEguy]

Hey Guido. When we do head gaskets on engines with aluminum heads they typically have torque to yield bolts. They are torqued and then an angle gauge is used with two dials. Line up the two zero's and the lower one has a 1/2 drive opening which turns with the socket. You turn it until the desired angle is reached. This allows for an even clamp as the bolt stretches. Ours might be Snap-On. Gerard

 

[guido]

Hello ASEguy,

It always amazing to see guys fighting the unmovable. Torque values are set in stones and not subject to interpretation! Here is one specification for you. It is not directed at you by any means.
Caterpillar C-10Head torqueing sequence 26 bolts into cast block. final torque 160 Lb. Foot.
first torque to 50 Lb. Foot, then 100 Lb. Foot, then 160 Lb. Foot. Then turn bolts an additional 90Degrees. Loosen all 26 bolts until washers are loose from the bolt. Then do the procedure all over again, FINALLY DONE? NOT. Bolt 27 to 33 now get torqued to 28 Lb. Foot + or - 5 Lb. Foot.
All fasteners are to be lubricated with 6V-4876 lubricant.

Guido.