Go Back   The Ford Barn > General Discussion > Model A (1928-31)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 07-14-2019, 07:00 PM   #1
ursus
Senior Member
 
Join Date: May 2010
Location: Oregon
Posts: 1,369
Default Rear Axle Fastener Torque

I'm helping a guy whose rear axle has a leak somewhere around the torque tube / banjo junction. The previous owner rebuilt the rear end using non-Ford bolts with lock washers all around the banjo, left and right bells, and the torque tube. I'm only familiar with the original Ford assembly which has no lock washers and bolts torqued to 35 lbs and secured with wire.

What torque should be needed in this situation where there are lock washers squishing around under the bolts?
ursus is offline   Reply With Quote
Old 07-14-2019, 07:09 PM   #2
Penthode
Member
 
Penthode's Avatar
 
Join Date: Oct 2016
Posts: 60
Default Re: Rear Axle Fastener Torque

I'd remove and replace the bolts with the proper Ford fasteners. It's not expensive and you can properly torque the bolts and know it's done right.
Penthode is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 07-15-2019, 11:50 AM   #3
1931 flamingo
Senior Member
 
1931 flamingo's Avatar
 
Join Date: May 2010
Location: new britain,ct 06052
Posts: 9,389
Default Re: Rear Axle Fastener Torque

Unless the threads have been "screwed" up by the new bolts/ Try some sealer on the bolts or wrap dental floss on the bolts and re-install. FWIW
Paul in CT
1931 flamingo is offline   Reply With Quote
Old 07-15-2019, 12:19 PM   #4
ursus
Senior Member
 
Join Date: May 2010
Location: Oregon
Posts: 1,369
Default Re: Rear Axle Fastener Torque

I suspect that the threads may have been "screwed up" by the Grade 5 non-Ford bolts and will continue to use them in this situation. I will remove the torque tube, clean up the mess, and replace the tube with a generous application of Permatex Aviation Sealer.

My main question concerns the amount of torque needed for securing bolts having lock washers as compared to bolts without.
ursus is offline   Reply With Quote
Old 07-15-2019, 12:29 PM   #5
100IH
Senior Member
 
Join Date: Dec 2011
Location: SW Idaho
Posts: 970
Default Re: Rear Axle Fastener Torque

No difference, 35 # creates the acme clamping force as another fastener with 35#. A change in thread pitch will alter clamping force. The lock washers might diminish the ability to seal under the head of the bolts.
100IH is offline   Reply With Quote
Old 07-15-2019, 01:35 PM   #6
redmodelt
Senior Member
 
redmodelt's Avatar
 
Join Date: May 2010
Location: Portland OR
Posts: 6,339
Default Re: Rear Axle Fastener Torque

Sponsored Links (Register now to hide all advertisements)
The bolts attaching the tube to housing are blind or open to outside only. You only have to worry about sealing the flange.
__________________
I know the voices aren't real but damn they have some good ideas!
redmodelt is offline   Reply With Quote
Old 07-15-2019, 03:28 PM   #7
john in illinois
Senior Member
 
john in illinois's Avatar
 
Join Date: May 2010
Location: Illinois
Posts: 2,181
Default Re: Rear Axle Fastener Torque

I would remove the bolts 1by 1 and put good used ford bolts in torqued to 30-35 lbs with blue loctite to seal them.

John
__________________
Welcome each day
john in illinois is offline   Reply With Quote
Old 07-15-2019, 08:18 PM   #8
Joe K
Senior Member
 
Joe K's Avatar
 
Join Date: Jul 2010
Location: Cow Hampshire
Posts: 4,175
Default Re: Rear Axle Fastener Torque

The presence of lock washers will not affect the stretch desired in the bolt on tensioning. Torque to the same amount. By the time the torque is sufficient, the lockwasher is "flat" anyway.

I would replace with Ford bolts without lockwashers. The difference in bolting between aftermarket and original Ford bolts is one of sizing tolerance, the Ford bolts being a higher class fit of bolt (i.e. less space between male and female thread) Using a non-ford bolt in a Ford hole will not change the thread of the Ford hole. Permatex type substance improves your chance of a leak-free fit and most bolting torque values are specified "lubricated" which the Permatex compound is a suitable substitute.

Joe K
__________________
Shudda kept the horse.
Joe K is offline   Reply With Quote
Old 07-16-2019, 01:50 PM   #9
ryanheacox
Senior Member
 
ryanheacox's Avatar
 
Join Date: Apr 2013
Location: Northwest CT
Posts: 1,092
Default Re: Rear Axle Fastener Torque

Quote:
Originally Posted by redmodelt View Post
The bolts attaching the tube to housing are blind or open to outside only. You only have to worry about sealing the flange.

They are through holes, not blind.


Edit: Was thinking of the axle housing to banjo connection

Last edited by ryanheacox; 07-18-2019 at 07:20 AM.
ryanheacox is offline   Reply With Quote
Old 07-17-2019, 08:10 PM   #10
redmodelt
Senior Member
 
redmodelt's Avatar
 
Join Date: May 2010
Location: Portland OR
Posts: 6,339
Default Re: Rear Axle Fastener Torque

Sorry I was not clear enough, this is what I was referring to; "I'm helping a guy whose rear axle has a leak somewhere around the torque tube"
__________________
I know the voices aren't real but damn they have some good ideas!
redmodelt is offline   Reply With Quote
Old 07-18-2019, 07:19 AM   #11
ryanheacox
Senior Member
 
ryanheacox's Avatar
 
Join Date: Apr 2013
Location: Northwest CT
Posts: 1,092
Default Re: Rear Axle Fastener Torque

Nope, you're fine. I read this entire thread and somehow still thought trumpet to banjo instead of torque tube...
ryanheacox is offline   Reply With Quote
Old 07-18-2019, 09:04 AM   #12
redmodelt
Senior Member
 
redmodelt's Avatar
 
Join Date: May 2010
Location: Portland OR
Posts: 6,339
Default Re: Rear Axle Fastener Torque

He asked about both, but his main concern seems to be the T-tube to banjo. Because they are wired after install they would just be a standard 3/8" find thread bolt. ( I have not read anything to say otherwise)
__________________
I know the voices aren't real but damn they have some good ideas!
redmodelt is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 04:24 PM.