Saw a new product the other day, new to me anyway, locktite on a roll, like teflon tape. Its a super thin film tape, pretty trick.

 

heres a little tip on torque specs when you have a spec that says: 27-34 ft lbs. does that mean you get to pick anywhere in between those two numbers? No it means it is a two torque sequence. first 27 ft lbs,- then go back and do the 34ft lbs in the same torque pattern. something that has a spec like that is not an in between number up for interpretation ,

 

Not true. The torque specified will always have a tolerance range and in your example the tolerance range is 8 ft lbs. Since absolute values are impossible to achieve, every "complete" specification has a tolerance range associated to it.

 

I disagree with you on this. that spec is given without any tolerance given it .granted all torque wrenches have a given error tolerance in them (usually +/-2%) all torque will have a variance not the 8 lbs suggested, manufacturer wants a certain number and doesn't leave it up to tech to decide that number. as a certified master mechanic of over 40 years, I can say with certainty that that is correct.

 

by the way I never do the first torque! just the final unless its stretch bolts

 

I fully respect your mechanical experience, however you claim that what most recognize as a range, is actually a sequence, yet you admittedly ignore the first value of the sequence and jump right to the last step. What is the purpose of the sequence then, and why would you skip it? I'm a maintenance tech also, typically anything that actually requires a progressive torque sequence is clearly laid out in the procedure.

 

well because of my experience I realize that that first torque is to have an even start point for the second step I can come pretty close with a wrench/socket and have an even torque for final step. and have no problems. in a regard to the spec being a range, what about the specs that only give one number? why dont they have any given "range"?

 

we will just have to agree to disagree on this point

 

If a torque value is specified without a tolerance or range, that torque specification is incomplete and would not comply with any currently recognized engineering design standard that I'm aware of.

That said, your method will provide an acceptable result relative to the requirement, but so will torquing the fastener to any point within the specified range.

Agreed!

 

Not really disagreeing with you just asking a question.

Checking Torques on Fasteners with Lock
Patches

To check the torque on a fastener that has a lock patch:
1. Set the torque wrench for the lowest setting in the specified
torque range.
2. Attempt to tighten fastener to set torque. If fastener does
not move and lowest setting is satisfied (torque wrench

clicks), then the proper torque has been maintained.

Granted this HD service manual note is specific to fasteners with lock patches but does specifically refer to the "torque range", and it clearly says if the bolt doesn't move at the lower specification value, then it satisfies the specification.
Guess you'll have to agree to disagree with the HD service manual.