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Rear drum brake support plate to axle housing nuts
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FURY
Posted 2022-08-29 1:16 AM (#623880)
Subject: Rear drum brake support plate to axle housing nuts



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Location: Auckland, New Zealand.
Hi has anybody else noticed that the 5 rear drum brake-support-plate-to-axle-housing nuts (3/8 UNF/24T), which according to the service manual should be torqued to 35 ft/lbs, will strip out the T bolts/studs, if torqued to 35 ft/lbs?



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1960fury
Posted 2022-08-29 9:58 AM (#623892 - in reply to #623880)
Subject: Re: Rear drum brake support plate to axle housing nuts



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Oh yes! For some reason they do and I use precision Snap On clock type torque wrenches only.
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FURY
Posted 2022-08-29 4:50 PM (#623902 - in reply to #623880)
Subject: RE: Rear drum brake support plate to axle housing nuts



Elite Veteran

Posts: 1044
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Location: Auckland, New Zealand.
I’m also using a Snap-On torque wrench. The first set I took up to 35 ft/lbs and they felt real soft. Taking them off again to change a shim, all the threads are gone on the studs. Replaced with a new set and took them only to 25 before they were feeling like they didn’t like it. But at 25 after I removed the nuts again the threads looked ok and I could still wind the nuts on by hand all the way up to the washer no problem. In your opinion, is 25 ft/lbs enough for these? Do you think the 35 ft/lbs is a typo in the manual?
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Powerflite
Posted 2022-08-29 5:54 PM (#623905 - in reply to #623880)
Subject: Re: Rear drum brake support plate to axle housing nuts



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They are made to be soft. You can only reuse them a couple of times before you have to replace them. It's a lot better to strip the nuts than to strip the unobtainable bolts.
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1960fury
Posted 2022-08-31 7:21 PM (#623954 - in reply to #623880)
Subject: Re: Rear drum brake support plate to axle housing nuts



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Sorry, Glenn I misread that. I never experienced soft nuts, just bolts and only after a couple of times removing and tightening. I didn't noticed my mistake, until I read Nathans post. Weird you had the same problem, just with the flange nuts.
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FURY
Posted 2022-08-31 7:28 PM (#623955 - in reply to #623954)
Subject: Re: Rear drum brake support plate to axle housing nuts



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Location: Auckland, New Zealand.
No you were right the first time. It is the T bolts/studs that strip out at 35 ft/lbs, the nuts remain mint.
Do you think torquing to 25 ft/lbs will be sufficient in your opinion?
Glenn.
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1960fury
Posted 2022-08-31 9:15 PM (#623957 - in reply to #623955)
Subject: Re: Rear drum brake support plate to axle housing nuts



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FURY - 2022-08-31 7:28 PM

No you were right the first time. It is the T bolts/studs that strip out at 35 ft/lbs, the nuts remain mint.
Do you think torquing to 25 ft/lbs will be sufficient in your opinion?
Glenn.


Not sure, as these hold the shafts in place. IIRC I replaced the bad T-bolts (not all stripped) with regular, modified hardened bolts. Most torque specs are for dry threads. Maybe that is the problem? If your threads are oily or have grease on them, there is a formula to correct the torque. Usually nobody pays attention and it will work anyway without damage, the flange T bolts seem to be an exception.

Not long ago I installed big block aluminum rocker shaft stands and the torque specs seemed absurd high to me (I believe 35 foot pounds too) and I tightened them only to 27, or so. Works so far.
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FURY
Posted 2022-08-31 9:49 PM (#623958 - in reply to #623957)
Subject: Re: Rear drum brake support plate to axle housing nuts



Elite Veteran

Posts: 1044
100025
Location: Auckland, New Zealand.
The bolts were very clean. After the first ones stripped I found a bag of DPCD axle shaft T bolts that I bought years ago as spares. I degreased them and painted the heads with zinc silver paint, so the threads weren’t oily or greasy. This is a couple of days a week car not a daily driver or race car. I think they’ll be ok at 25. The book calls for 30-35.
Thanks for your reply Sid. I’d like to meet you one day I think we have a lot in common.
Glenn.
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1960fury
Posted 2022-09-01 8:30 PM (#623970 - in reply to #623880)
Subject: Re: Rear drum brake support plate to axle housing nuts



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Thanks. The same is true for me Glenn, thats for sure. If you ever visit Germany, drop by, stay as long as you want.I have a guest house.
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