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07-14-2019, 07:00 PM | #1 |
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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? |
07-14-2019, 07:09 PM | #2 |
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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.
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07-15-2019, 11:50 AM | #3 |
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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 |
07-15-2019, 12:19 PM | #4 |
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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. |
07-15-2019, 12:29 PM | #5 |
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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.
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07-15-2019, 01:35 PM | #6 |
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Re: Rear Axle Fastener Torque
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07-15-2019, 03:28 PM | #7 |
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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
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07-15-2019, 08:18 PM | #8 |
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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
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07-16-2019, 01:50 PM | #9 | |
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Re: Rear Axle Fastener Torque
Quote:
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. |
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07-17-2019, 08:10 PM | #10 |
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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"
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07-18-2019, 07:19 AM | #11 |
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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...
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07-18-2019, 09:04 AM | #12 |
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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)
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