PB Blaster affecting torque spec?

I installed Sumo Springs and needed to use PB Blaster to loosen the nuts on the U-bolts. I had to use a lot over two days. As I was putting the nuts back on, I wondered if the Blaster changed the torque spec (37 ft/lb) recommendation. There is fair amount of residue on the threads.

Edited to fix typo 37 ft/lbs not 32 as I originally typed.

 

Your Ubolt nuts should be torqued to way more than 32 ft/lb.....just sayin

 

I torqued my u-bolts to 83 ftlbs. Wipe the PB Blaster off.

 

If you didn't chase the threads and get everything nice and clean, the torque you applied is irrelevant, as it's only a guess.

 

if you have the OEM U-bolts that yes, the torque spec is 37 foot-pounds. I have the aftermarket U bolt flip kit from Wheeler's off-road and the torque spec on those are 80 foot-pounds.

Edited: 37 lb not 32....sorry

 

Typo 37 not 32.

I checked the Torque Specs in the stickies and that is what was shown.

 

I did not chase the threads.

 

The lower the torque spec, the more critical is that everything clean and accurate. At 150 ft-lbs, 5-10 lbs either way isn't going to matter much (usually) but when you're down to 20-30 ft-lbs, it becomes a bit more important. You could easily be 10 ft-lbs low if you're putting dirty fasteners together. If you're really concerned about accuracy here (and I wouldn't get too worked about it), then you should replace the nuts with new, wire-brush the bolts and chase the threads, THEN re-assemble and re-torque.

 

I understand what you are saying, thank you. I think that I am leaning to the not getting too worked up side of things.

 

The ubolt torque specs of 37 ft lbs was a typo in the service manual, the numbers were transposed. It should have read 73 ft. Lbs.

 

Are you serious, that is a significant difference.

 

Yes, This has been discussed here a number of times.

 

I will search, I missed this completely.

 

Yes he is. On 1st gens the factory service manual torque spec on u-bolts is 90 ft/lbs. There is no way that Toyota would make the u-bolts (the only thing holding your rear axle onto the truck) 37 ft/lbs, that is definitely a typo on their part

 

All I can say is "thanks", what you are saying does make sense. Frankly, I am shocked.

 

Yeah I think Toyota should have probably made it more clear to everyone (even consumers) when that mistake was found, but they probably only made it clear to their technicians.

And as always especially with u-bolts, make sure you re-torque them after a couple hundred miles because u-bolts do tend to lose a little torque after initial install

 

I searched on DDG and there is a lot of chatter on other Toyota forums that agree with you. Man, this is a serious problem. I am glad I wrote. And off I go, torque wrench in hand. I think I was very lucky.
Thank you, one more time.

 

I converted the Newton meters to foot pounds and the error is the same, 50 N/M = 37 ft/lb.

 

Yeah, torque em to at 73 lbs at least.

 

So, thats one of the reasons why I think this 73 vs 37 thing might be a TW 'myth'. Kind of like the 36mm axle nut socket myth haha

Also we have plenty of Toyota techs on here. I would think that if 73 was the real deal they would have had some sort of official documentation stating the error. But Ive never seen anything like that posted up on here.

For what its worth, the Icon RXT leaf pack calls for 75ft/lb (I think..) When I did that it squished the stock bump stop mounting plate. A pic of before and after (when I switched configurations on the leaf pack)




Cant for the life of me find the actual picture but this is where Im talking about