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Old 04-03-2018
Friday1 Friday1 is offline
Senior Member
Join Date: Feb 2010
Location: Toledo
Posts: 1,544
Default Wheels away

This happened to a Canadian friend on Easter. He has a 1962 PD4106 GM bus like mine. He had recently done a full brake job, new shoes, drums, studs and thimbles. These are stud piloted 10 hole Budd wheels. The new studs were pressed into the hubs, not drawn in with a nut. They were tightened with a known good torque wrench. He is going to do some forensics to determine what happened. I'm thinking overtorqued or defective studs or both. A good idea is to specify Euclid or another good brand of studs and nuts when replacing them.

We had a bit of an “oops” today. We had the right rear duals pass us on the highway today. First off, we are fine, the bus hasn’t suffered irreparable damage, we are safe , no one was hurt, and other than the Jeep no other damage. We’re not looking to find fault, just putting the information out there so everyone can learn along with us.
We are in good hands , the towing company is very knowledgeable and respectful of old busses. They have already arranged to have a shop bring the bus indoors.


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1980 FC35, 1961 PD4106 GMC SN:326 Charter member of the Two Bus Club for now
I am in Toledo, Ohio
Rick Gunther
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Old 04-04-2018
Mike Hohnstein's Avatar
Mike Hohnstein Mike Hohnstein is online now
Senior Member
Join Date: Jan 2008
Location: NW Milwaukee Metro Area
Posts: 4,255

I think the 450 ft.lb. dogma for the inner castle nut is too much. Torque tables are variable for many obscure reasons, however I'm comfortable with 350 on the inners and 450 for the outers.
Mike Hohnstein
FMCA 97824
Germantown, WI/Myrtle ID

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Old 04-04-2018
MRPutz's Avatar
MRPutz MRPutz is offline
Burnin Up in Az. :-)
Join Date: Apr 2008
Location: Mesa
Posts: 4,057

Originally Posted by Mike Hohnstein View Post
I think the 450 ft.lb. dogma for the inner castle nut is too much. Torque tables are variable for many obscure reasons, however I'm comfortable with 350 on the inners and 450 for the outers.
All I've heard for many years was 450 ft/lb for our wheels. But as you mention Mike when I look up torque specs for bolt diameters the only ones that come close to 450 are Standard 12K, 170,674 psi, Med. Carbon Steel bolts. If some one is selling a bolt that does not have that high rating then the bolts are being over torqued.


BUT, there are several other factors that could have happened as well.
  1. Cheap quality bolt used in place of standard bolt
  2. torque on bolts was not performed "dry"
  3. Bolts were actually over toqued

I've never had a stud on my bus break, but I've always check the torque on them myself too. I have had studs break on single body delivery trucks I drove as a kid but who knows how they were cared for?

Sure does warrant some more research on our torque specs and the quality of the replacement parts we put on our buses!

BTW, My Brother (heavy haul) was involved in an accident where a load was dropped. After the investigation it was discovered the chains used where not rated as high as they were stamped. The chains were cheap copies from China stamped with higher ratings than they were designed for. I'd hate to see that happen on wheel studs too.
Michael & Tami Putz
78FC35SB Wanderlodge - "Putz'n Around"
'90 GL1500 Goldwing | '67 VW Rail | '82 CJ5 Jeep
eMail=Mike.Putz@cox.net | Web=http://mikeputz.com/
Solar = https://www.solarpenny.com/SearchResults.asp?Cat=257

FMCA #236459, Good Sam #17270530, Vintage Birds #1509
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Old 04-04-2018
Mallie Lennon's Avatar
Mallie Lennon Mallie Lennon is offline
1995 WB 42’ Series 60
Join Date: Jan 2011
Location: Eufaula
Posts: 4,931

Truck wheel studs are a special animal, unlike any other.
Mallie & Karen Lennon
Eufaula, Oklahoma
95 42' Wanderlodge
Please use e mail instead of Private Message
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