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Old 06-17-2021, 05:04 PM   #1
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Cannot find lug nut torques ANYWHERE!

Neither my P30 Chassis Manual nor my Chevrolet Owner's Manual lists the suggested lug nut torques for my beloved Flair.

Have 225/70 x 19.5 steel wheels with clamping ring, five lugs nuts, bolt size 5/8-inches.

TIA
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Old 06-17-2021, 05:56 PM   #2
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Quote:
Originally Posted by GuyG View Post
Neither my P30 Chassis Manual nor my Chevrolet Owner's Manual lists the suggested lug nut torques for my beloved Flair.

Have 225/70 x 19.5 steel wheels with clamping ring, five lugs nuts, bolt size 5/8-inches.

TIA
175 ft lbs.
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Old 06-17-2021, 05:59 PM   #3
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Quote:
Originally Posted by ga traveler View Post
175 ft lbs.
THANK YOU! ga traveler.
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Old 06-17-2021, 06:09 PM   #4
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I don't think so. Not with just 5 lug nuts. The fewer the nuts, the higher the torque. I think they're up in the 425 ft-lb range like on my old Bounder. BRB, gunna check...

Yes, my 19.5" Tires on my Bounder had 6 lug nuts, and were torqued to 475 ft-lbs per the spec's provided by Freightliner.

So you should count your lug nuts and if there are only 6, they need over 400 ft-lbs by golly.

I'd be surprised if a P30 chassis only needs 175 ft-lbs on 5 lug nuts. That's what a shop once torqued my fronts to (I didn't know I was new to RV'ing...and they were a big truck tire shop so I trusted) when I bought a set of fronts and months later I hit a transition between the road and a cement on ramp for a small remote freeway bridge and POW, wobble wobble wobble as 3 of them all let loose at the same time.

I know! I'm as surprised as you, but it happened. You can read my ad free article about it here: Tires & Wheels...

I've upgraded to 22.5" wheels and they are the same, 450-475 ft-lbs. And here's a funny thing, the chrome 'hub caps' (2 jamb nuts per wheel) only require 40 ft-lbs on the jamb nuts so be careful of shops using their big impact driver to put your caps back on 'cus more than 60 ft-lbs will distort the metal of the caps making them a bear to remove without ruining them.
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Old 06-17-2021, 06:57 PM   #5
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Thanks, Jim.

I can't help but wonder if a 5/8 bolt could actually take that much torque. Also, from a purely unscientific perspective, I was able to break the lug nuts loose with a 24-inch breaker bar and a very short cheater on it and while lying on my back under it (because the wheels are several inches in from the body). I really wonder if I could have done that with the nuts torqued that high.

And I know what you mean about the chrome hub caps. I actually think that over-tightening them (who ever installed them) may have been the reason I even had to take the wheel off. I was getting a noise that sounded very much like the tension "spring" on the brake caliper was broken and occasionally causing a rattle that coincided with the wheel turning. Turns out brakes were fine but when I loosened the hub caps they popped with just about the same sound I was hearing that prompted me to investigate the brakes.
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Old 06-17-2021, 07:10 PM   #6
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Torque for P30 with 19.5" wheels is 150-170 ftlbs.
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Old 06-17-2021, 07:20 PM   #7
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5/8's missed that. Well, yeah, that sounds like it needs a lower torque. Just checked online and I'm reading 190 ft-lbs for a 5/8" lug nut for a 16" wheel. couldn't find any torque sheets that went up to 19.5" for a 5/8's lug nut. So still sounds like it needs more torque.

Best to settle this by finding the specs from the P30 chassis manufacturer. It's gotta be out there somewhere.

Found this on a RV forum:

"I just looked in a P-30 manual.

(http://www.bdub.net/manuals/P30/index.html)

The 5/8 studs/lug nuts used on the HD P-30/32 suspension that comes with rear disc brakes use 180 ft lbs. The 9/16" studs used on the lighter MH chassis call for 140? "

So I'd say you'd be good for anything between 175-190 ft-lbs.
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Old 06-18-2021, 06:12 AM   #8
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THANK YOU! ga traveler.
I looked it up in my Chevrolet shop manual. Page 3E10 wheel lug nut torque is 130 to 180 ft lbs. As I stated earlier, our shop always torqued to 175 ft lbs.
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Old 06-18-2021, 06:35 AM   #9
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Torque is based upon bolt size, thread pitch and hardness, not the number of holes in the wheel. The optimum torque for a 5/8" fine thread grade 8 bolt is 180 lb. ft. It will have the same torque regardless of the application.
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Old 06-18-2021, 10:29 AM   #10
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I'm an old guy and have never used a torque wrench on lug nuts. I've R&R the 19.5s on my P32 several times. Reinstalling gets done with a 3/4" six point socket, short extension, attached to a long breaker bar. People will disagree but imo, it's not rocket science.

Edited to add,,, Just looked in the Workhorse Chassis manual to get some numbers.

Ours is the 15,000 lb chassis with 5/8" lugs. The manual states that the lugs need 175 ft lbs of torque on both the 10 lug rear and the 5 lug front.
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Old 06-19-2021, 07:41 AM   #11
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Torque is based upon bolt size, thread pitch and hardness, not the number of holes in the wheel. The optimum torque for a 5/8" fine thread grade 8 bolt is 180 lb. ft. It will have the same torque regardless of the application.
Yup, Has got nothing to do with number of holes. The bolt doesn't know what's around it.
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