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#1 |
Registered User
Join Date: Nov 2012
Location: Tacoma, WA
Posts: 133
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'72 C20 Wheel Bearing adjustment/torque?
Specs: '72 C20 Camper Custom, 3/4 ton, disk brakes up front and drums in the rear.
Ive searched a bunch of post and I'm having trouble figuring out how to properly seat the bearings and torque/set the castle nut once I've re-installed all new bearings and associated parts. Some post tell me to torque the castle nut to 15 ft. lbs. and then back it off, re-tighten finger tight, then back off to align the cotter pin. Some post tell me to tighten to upwards of 50 ft. lbs. back off, re-tighten to 30 ft lbs. and then align for cotter pin. My Chilton talks about tightening the inner adjustment nut (??) to 50 ft lbs then loosening and retightening to 35 and then backing it off to nearest hole lock washer and installing a locknut?? Mine only has a castle nut?? Beyond those instructions in the Chilton they give references to just about every year except the '72 3/4 ton.. Im confused...help appreciated.. |
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#2 |
Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: '72 C20 Wheel Bearing adjustment/torque?
Chilton generally do better in birdcages than toolboxes.
Haynes IMHO are much better and help bridge the knowledge gap factory manuals assume the user has. But no matter you should have a copy of the factory manual to refer to. * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here
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Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID ** Blazer SPID ** Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders ** Do you have a 1972 Plaid Pickup? ** Plaid Blazer ** Plaid Suburban |
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#3 | |
Registered User
Join Date: Nov 2012
Location: Tacoma, WA
Posts: 133
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Re: '72 C20 Wheel Bearing adjustment/torque?
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#4 |
Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: '72 C20 Wheel Bearing adjustment/torque?
Download the factory manual and start reading "FRONT SUSPENSION 3-3" .
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Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID ** Blazer SPID ** Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders ** Do you have a 1972 Plaid Pickup? ** Plaid Blazer ** Plaid Suburban |
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#5 |
Senior Member
![]() Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,234
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Re: '72 C20 Wheel Bearing adjustment/torque?
Therex no torque setting its more of a feel
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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#6 | |
Registered User
Join Date: Nov 2012
Location: Tacoma, WA
Posts: 133
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Re: '72 C20 Wheel Bearing adjustment/torque?
Quote:
truckdude239..so, if its technique...can you pass on a "How-To"/some pointers? Can anyone answer part of the question..is it "turn the castle nut till its snug and then back it off and insert cotter pin" type Technique ....or is it the higher torque example i sighted in my original post? the higher torque one seems like a lot of torque.. ![]() thanks.. |
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#7 |
Registered User
Join Date: May 2013
Location: Post Falls, ID
Posts: 889
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Re: '72 C20 Wheel Bearing adjustment/torque?
Tighten it down just snug. You should be able to move the washer with a wide blade screw driver. It shouldn't "float around" under the nut, but you should be able to move it, without too much difficulty. The object is to [just] load the bearing. It is kind of a feel thing. Hope that helps.
-Russ Last edited by Greasey Harley; 04-28-2014 at 01:48 AM. |
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#8 | |
Registered User
Join Date: Nov 2012
Location: Tacoma, WA
Posts: 133
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Re: '72 C20 Wheel Bearing adjustment/torque?
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#9 |
Registered User
Join Date: Oct 2013
Location: San Fernando Valley, CA
Posts: 84
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Re: '72 C20 Wheel Bearing adjustment/torque?
Download the factory chassis service manual here to your computer.
Follow the directions in the factory manual. Nothing is better than a factory manual.
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1971 Chevy C30 Custom Camper Cab Chassis Dually 402 TH400 4.10:1 Eaton HO72 1969 Ford Mustang "Mach 1" 428CJ 4 speed "R Code" 1970 Mercury Cougar "Eliminator" 351C-4V C6 1972 Ford Ranchero GT 351C-2V C6 1974 Honda XL-350 Member of the "6 C's and a D" 1-Ton Fun Club! |
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#10 |
Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: '72 C20 Wheel Bearing adjustment/torque?
Actually I pasted in my currently unused signature links just so you could download a manual up in post #2. :-)
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Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID ** Blazer SPID ** Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders ** Do you have a 1972 Plaid Pickup? ** Plaid Blazer ** Plaid Suburban |
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#11 |
Registered User
Join Date: Oct 2013
Location: San Fernando Valley, CA
Posts: 84
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Re: '72 C20 Wheel Bearing adjustment/torque?
The adjustment info in the factory manual is what is required for longevity and safety. Do things right and you do things once. They cost a bit more then the Chilton & Haynes books but they save time and money in the long run. They also prevent frustration and failed repairs.
Can't tell you how many steering knuckles I have seen in the junk yards ruined from improper wheel bearing adjustment procedures. I did download the manual here but the hard copy book was the first purchase I made when I bought my truck. I bought the manual before I even took the signed title in hand to transfer it in my name. Faxon auto literature in Riverside, CA sell originals and reproductions. Without the forum vendors here we might not have this forum so please support the vendors here on the board, they should have reproduction copies available for purchase also. P.S. The factory manual says torque to 40 lbs. with additional information on the proper procedure to set the required preload on the bearing. The required preload can only be obtained with the procedure outlined in the manual. The bearing must be preloaded, if not it can affect alignment, steering geometry and bearing wear. Wheel bearings are critical components. Improper preload can lead to premature bearing failure, spindle damage, serious damage to your truck and even death if you are involved in an accident as a result of a repair failure. Stay thirsty my friends, use the factory manuals. My safety thanks you.
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1971 Chevy C30 Custom Camper Cab Chassis Dually 402 TH400 4.10:1 Eaton HO72 1969 Ford Mustang "Mach 1" 428CJ 4 speed "R Code" 1970 Mercury Cougar "Eliminator" 351C-4V C6 1972 Ford Ranchero GT 351C-2V C6 1974 Honda XL-350 Member of the "6 C's and a D" 1-Ton Fun Club! Last edited by 71Dually; 04-28-2014 at 09:47 AM. Reason: add P.S. |
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#12 |
Registered User
Join Date: Jul 2012
Location: Ft Wayne Indiana
Posts: 1,204
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Re: '72 C20 Wheel Bearing adjustment/torque?
On my 71 3/4 ton, we tightened them snug and backed them off about 1/8 turn. Wheels haven't fallen off yet.
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71 K20 64 GMC mud truck |
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#13 |
Registered User
Join Date: Nov 2012
Location: Tacoma, WA
Posts: 133
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Re: '72 C20 Wheel Bearing adjustment/torque?
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#14 |
Registered User
Join Date: Apr 2014
Location: CA
Posts: 27
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Re: '72 C20 Wheel Bearing adjustment/torque?
I used the Timiken bearing website. Using these directions, about 7,000 miles and no noise or issues.
http://www.timken.com/en-us/solution...ts/Vol1No5.pdf |
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#15 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: '72 C20 Wheel Bearing adjustment/torque?
It's in the factory service manual. That's where I got my info to do my 3/4-ton. Don't stay home without it.
It's also different for C10 vs C20 vs C30. So if someone tells you one thing, make sure it's for your model.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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#16 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Well I have tightened several vehicles as stated and never had a problem.
The way I do it is tighten until the wheel want move anymore and then tighten it some more. Then back off enough to spin the calipar by hand good because once the wheel is in place it adds torque to spinning it. Then align the cotter key and your done. I have never seen any Chevy with double nuts on them. One more thing most used spindals have the race inside of them from the old bearings. These need to be pressed out of the hub and a new ones installed to match the new bearings. This is a new rotor but you can see the race inside the hub, on a old hub this needs to coome out and new installed front and back. ![]() ![]() ![]()
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#17 | |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: '72 C20 Wheel Bearing adjustment/torque?
Quote:
I do a lot of things "my way" too. Doesn't make 'em right. Your way is admittedly exactly what I did until I was 40. Since the restoration I'm working on is something I want "right", I looked it up. I was surprised by the fact that both the procedure and the torque values are quite different for the C10 vs C20, which told me there is no one universal "catch all" way of doing them right. And if I seem a little paranoid about getting wheels on right, here's why. Of course it was the wheel, not the rotor, but I don't think that cotter pin is bent to spec :-)
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible Last edited by davepl; 05-01-2014 at 07:58 PM. |
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#18 | |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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![]() Quote:
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#19 |
Registered User
Join Date: Feb 2008
Location: Tacoma Washington
Posts: 890
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Re: '72 C20 Wheel Bearing adjustment/torque?
Andy gives the procedure I've used for a long time without issue. Make sure your races (inner and outer) are seated all the way in the hub. Make sure you replace races with bearings and use your used bearings with their original races. Don't pack the inside space between the bearings with grease....it acts like a centrifuge and can separate the excess grease causing issues. Four wheel drives use two nuts on the spindle. When you put it together the extra torque while spinning is to make sure everything seats. Then you back it off just enough to have free rotor spinning without any end play. It's not a linear accelerator! You can always jack up the wheel in a couple days and make sure you don't have any play. Good luck!
Jeff
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I know a guy who's addicted to brake fluid. He says he can stop any time. 72 K10 396 75 Cj5 MPI 350 Chev 67 Chevelle 396, 4 speed 74 FXE 08 Tahoe |
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#20 |
Registered User
Join Date: Nov 2012
Location: Tacoma, WA
Posts: 133
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Re: '72 C20 Wheel Bearing adjustment/torque?
thanks everyone! this is exactly what i needed...(andy4639 thanks for the pics!)
One more question..3/4 ton is the 20-30 series right? Truck is on hold until I get back this weekend..taking the wife on an overnight trip for our 13 yr anniversary...so few more days and then back on the road hopefully! |
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#21 |
Registered User
Join Date: Jul 2012
Location: Ft Wayne Indiana
Posts: 1,204
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Re: '72 C20 Wheel Bearing adjustment/torque?
3/4 ton is 20 series, 1 ton is 30 series.
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71 K20 64 GMC mud truck |
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#22 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Also make sure you keep the used bearing's as a set with the races if you take one a part to clean and repack.
Your welcome. ![]() ![]()
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#23 |
Registered User
Join Date: Nov 2012
Location: Tacoma, WA
Posts: 133
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Re: '72 C20 Wheel Bearing adjustment/torque?
so...all back together...almost. When i was putting the caliper bolts back in i noticed one of the calipers is missing the bushing that the caliper bolt goes through...so off to the parts store tomorrow.
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#24 | |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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![]() Quote:
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__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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