Fastener Torque Specs

[EddieC]

Is there a source for overall vehicle fastener torque secs?
(Specifically 2008 Tahoe 5.3 4wd)

 

[Scrappycrow]

The service manual I downloaded from https://charm.li/ has the values within the service instructions, but not in any separate lists of torques (that I have run across, at least).

 

[Fless]

The Haynes books have some torque settings in many of the sections, grouped within each chapter's page.

Rock Auto:

 

[EddieC]

The service manual I downloaded from https://charm.li/ has the values within the service instructions, but not in any separate lists of torques (that I have run across, at least).

Very Good

 

[Doubeleive]

i know you said 2008

 

[07burban88]

so when my pads measure m/a its time to replace. got it lol

 

[EddieC]

I am resurrecting this because of conflicts in information on brake component torque specs between different sources and hoping someone can provide the correct information.

This is related to 4wd Tahoe, 6 lug wheels.

As an example of the issue, the Haynes Manual 24067 and the above referenced manual (https://charm.li/) differ on the rear brake pins (Haynes 38 ft#, other ref 28 ft#) and the front and rear caliper mounting bolts appear to be opposite in the two manuals (front to rear comparison) as well as varying a bit off in one of the pairs (Haynes Front 129 ft#& rear 148 ft#, other ref front 148 ft# & rear 122 FT#).

And AI, well, garbage information as usual.

Anyone have a GM manual or other dependable reference, specifically for the brakes?

 

[mikez71]

If I had to guess, the haynes probably has front and back caliper specs flipped. (Front being larger and handling more braking)
I don't think you will hurt caliper pins going to the higher spec of 38ft/lb.. (unless the screw is smaller than I think?)
So to answer your question, I don't know!

I wonder about my steel wheel lug torque, because the lug nuts on my 17" steelies are grooving out. (I tighten them evenly)
AI tells me steel wheels require less torque..
OBS and NBS list 120ft/lb for stock alloys, but NNBS+ is listed at 140ft/lb.

 

[EddieC]

If I had to guess, the haynes probably has front and back caliper specs flipped. (Front being larger and handling more braking)
I don't think you will hurt caliper pins going to the higher spec of 38ft/lb.. (unless the screw is smaller than I think?)
So to answer your question, I don't know!

I wonder about my steel wheel lug torque, because the lug nuts on my 17" steelies are grooving out. (I tighten them evenly)
AI tells me steel wheels require less torque..
OBS and NBS list 120ft/lb for stock alloys, but NNBS+ is listed at 140ft/lb.

Thanks for the reasoning on possible Haynes flipped numbers.

 

[rdezs]

Just keep in mind that the proper torque values are measured with clean, dry threads.... Unless specifically mentioned, such as arp head studs.

Clean means more than just blown out with compressed air. Chase the threads with a tap, then blow it out. If the threads are oily, brake cleaner prior to blowing out.

When the threads are not clean, you end up under torqueing the fastener, due to excess drag in the threads.

 

[Scrappycrow]

Chase the threads with a tap

While I do this, it's important to have a "feel" for the tap's behavior so you're not recutting the threads. If it's taking more than a small amount of effort to run the tap in, stop and find a thread chaser, which will clean up the threads with less of a chance of damaging them.