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06-24-2024, 08:45 AM | #1 |
Registered User
Join Date: Feb 2009
Location: PA
Posts: 32
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1967 K20 Adjust rear wheel bearings after new seal install
Hey Guys: Need help from anyone who has replaced rear axle seals on HO52 axle and adjusted rear wheel bearings after.
- The GM Service Manual states: torque outer lock nut to 175 ft lbs. I tried it and it just does not work. The lock ring gets distorted and worse, the bearing load it creates causes so much drag, the hub turn is way too stiff. - I ended up torqueing the outer lock nut to 45 ft. lbs. and it all seemed ok. No wheel bearing end play. Hub turned freely. Ear of lock ring tab bent into a recess of lock nut as per manual. - My question: have others run into this? Reluctant to think Service Manual is wrong, but 175 ft. lb torque spec for outer lock nut just does not work. (maybe a typo - shoulda been 75 ft. lbs. ??) What have you other guys done? Appreciate any thoughts, advice. Thanks. |
06-24-2024, 10:06 AM | #2 | |
20' Daredevil (Ret)
Join Date: May 2003
Location: Jefferson State
Posts: 13,682
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Re: 1967 K20 Adjust rear wheel bearings after new seal install
Quote:
When you say rear wheel bearings and axle seals, I'm thinking the outer ends of the axle, where the wheels are. When you say 175 ft lbs, I'm thinking pinion seal at the front of the differential.
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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06-24-2024, 11:22 AM | #3 | |
All about them K’s
Join Date: Jun 2014
Location: Land of Entrapment
Posts: 6,434
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Re: 1967 K20 Adjust rear wheel bearings after new seal install
Quote:
Not sure where they got 175 from that’s way too much.
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Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne: 5” lift, 35’s, front dana 60 blah blah blah… http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB: 4” lift 33”s… in a million pieces http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 35x12.5x20’s |
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06-24-2024, 05:36 PM | #4 |
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Location: PA
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Re: 1967 K20 Adjust rear wheel bearings after new seal install
Thanks for the reply Tyler; your confirmation is much appreciated. Never caught a mistake in a factory shop manual before, but 175 ft. lbs. seemed all wrong. That left me wondering ... go by what I know to be correct, that is, preload while spinning hub, no end play and hub smooth spin.
---Further confusing it was both the wheel bearing retaining nut and jam nut were finger tight when I disassembled the hub. It was that way for 20 years from the last shop who worked on the truck. --- It's been about 20 years since I had hubs apart; felt a little rusty - me not the hub. ---By the way, the rear hubs show an infrared temp reading of Left side 103 deg. and Right side 99 deg. on the test drive. Temps seem ok. Last edited by marina blue bob; 06-24-2024 at 06:47 PM. |
06-24-2024, 05:39 PM | #5 |
Active Member
Join Date: Apr 2021
Location: Santa Cruz, NM
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Re: 1967 K20 Adjust rear wheel bearings after new seal install
This is what my Haynes manual states:
"26)...tighten the adjusting nut to 50 ft-lbs while rotating the wheel, then back the nut off 90 degrees. 27) While continuing to rotate the wheel, retighten the nut to 35 ft-lbs, and then back it off 3/8 turn. 28) Install the lock ring and pin, turning the adjusting nut only far enough so the pin will engage the nearest notch. 29) Install the lock nut. Tighten the locknut to 50 ft-lbs on 1967 through 1971 models or to 80 to 100 ft-lbs on 1972 through 1976 models." What's the deal with changing from 90 degrees to 3/8 of a turn? The only sense I was able to make of any of it, is to positively seat the bearings. I stayed consistent with reducing the torque by 15 ft-lbs, and loosening the nut enough to where the wheel would rotate again. I believe I settled with 20 ft-lbs on the adjusting nut, and 80 ft-lbs on the lock nut. At some point, a person could strip the threads on the spindle. |
06-24-2024, 06:45 PM | #6 |
Registered User
Join Date: Feb 2009
Location: PA
Posts: 32
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Re: 1967 K20 Adjust rear wheel bearings after new seal install
Thanks Dashman. I appreciate your reply too. It's really nice to read directions like yours that are detailed, specific and easy to follow.
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06-27-2024, 02:40 PM | #7 |
Senior Member
Join Date: Dec 1999
Location: TX
Posts: 1,599
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Re: 1967 K20 Adjust rear wheel bearings after new seal install
Does your HO52 still have the barrel shaped rear bearings?
I recently replaced the rear bearings on my 1967 K20 with the tapered bearings that are more common today. I treated them like I do other tapered roller bearings, where I tighten until hard to turn and back off some to free turning. I think the service manual procedure is for the factory type NDH Barrel Roller Bearings. If you look at the bearing itself, the bearings are barrel shaped and not straight cylindrical. If you look at the race the bearings ride in, it is concave. Have you discovered Torque King for parts for your truck yet? Here's a link to their bearing set they sell, but I have called them a couple times and they have been very helpful. https://torqueking.com/product/8371/...52-ho72-axles/ If you read their descriptions it talks about the NDH (New Departure Hyatt) bearings. Have you discovered ChaparrallMan1974's build thread yet? He recently went through his whole chassis. https://67-72chevytrucks.com/vboard/...d.php?t=841272 |
06-30-2024, 04:30 PM | #8 |
Registered User
Join Date: Feb 2009
Location: PA
Posts: 32
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Re: 1967 K20 Adjust rear wheel bearings after new seal install
Thanks Jason. Yes I do buy from Torque King. A good company.
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06-30-2024, 04:34 PM | #9 |
Registered User
Join Date: Feb 2009
Location: PA
Posts: 32
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Re: 1967 K20 Adjust rear wheel bearings after new seal install
Anyone checking wheel bearing temps after wheel bearing adjustment? Would like to know what temp readings you’re getting.
My ‘67 K20 reads: 116 degrees Rear hub. 115 degrees Front hub. |
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