Differential flange nuts torque setting

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ppeters914
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Differential flange nuts torque setting

Post by ppeters914 »

Nothing in The Datsun Roadster Book.

From the TechWiki: Differential flange bolt - 8-9kg/m (57.8-65.1ft/lb.) Pat Mahoney's handy dandy Torque Values card similar.

Can anyone confirm these values? These are 5/16-24, mostly dry with a little gasket sealer on the treads.

Already seems pretty tight @ 40ft/lbs. Going to leave it there until I hear from the brain trust.

Thanks.
Last edited by ppeters914 on Sun Apr 14, 2019 4:07 pm, edited 1 time in total.
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pebbles
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Re: Differential flange nuts torque setting

Post by pebbles »

Seems way to high for a 3/8.
Grade 5 max is 30 dry.
Grade 8 max is 45 dry.
Axle flange bolt?
David




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Re: Differential flange nuts torque setting

Post by ppeters914 »

No, the ten nuts that hold the differential in the housing.
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Datrock
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Re: Differential flange nuts torque setting

Post by Datrock »

Pete, did you measure twice? 3/8" sounds a bit to big.
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Re: Differential flange nuts torque setting

Post by Toptech360 »

The original description says bolt. I would think the flange at the end of the pinion for the 4 nuts/bolts that hold the driveshaft to the pinion flange would be around that torque value. The nuts that hold the 3rd member to the axle housing are more likely in the 20ftlb range if I were to speculate.
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Re: Differential flange nuts torque setting

Post by ppeters914 »

Datrock wrote: Sun Apr 14, 2019 1:07 pm Pete, did you measure twice? 3/8" sounds a bit to big.
Measured thrice, typoed once. :roll:

Should have said 5/16-24. Earlier post corrected.

Thanks for catching that Bill. :smt003
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Re: Differential flange nuts torque setting

Post by ppeters914 »

Toptech360 wrote: Sun Apr 14, 2019 2:05 pm The original description says bolt. I would think the flange at the end of the pinion for the 4 nuts/bolts that hold the driveshaft to the pinion flange would be around that torque value. The nuts that hold the 3rd member to the axle housing are more likely in the 20ftlb range if I were to speculate.
I interpreted Differential flange in the TechWiki to mean the flange on the differential that goes over the studs on the housing.
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Re: Differential flange nuts torque setting

Post by Toptech360 »

65ftlb seems excessive for those. Have you checked a fsm?
Dan
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Re: Differential flange nuts torque setting

Post by ppeters914 »

Toptech360 wrote: Sun Apr 14, 2019 4:29 pm 65ftlb seems excessive for those. Have you checked a fsm?
The 311 and 411 manuals (which are pretty skimpy) just mention tightening the nuts in an alternating pattern. No torque values listed.

The 620 Resource site shows the Differential Attaching Nuts torque as 12-18 ft/lbs. A 620 pickup uses an H190 like the roadster; just different spline counts on the axles.

If 12-18 is correct, do I (should I) back off the nuts, then retorque, or.......????

Thanks,
Pete
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'67 1600 - frame off started in 2014. Now I know why roadster projects take so long. What a stupid idea. :smt021
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Re: Differential flange nuts torque setting

Post by pebbles »

Replace studs and nuts. Gasket might be compromised as well.
David




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Re: Differential flange nuts torque setting

Post by Toptech360 »

It's possible if you leave it as is it would be fine, but, I totally understand not being comfortable with that. What pebbles said would be your best insurance (unfortunately).
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Re: Differential flange nuts torque setting

Post by S Allen »

So. Obviously this needs to be corrected.

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Re: Differential flange nuts torque setting

Post by ppeters914 »

510 wagons also use the H190 live axle, and 510 guys confirm 12-18 ft/lbs.

After further consultation with Gordon & DEF, decided to back off 5 of the nuts, then retorque to 20 ft/lbs, then repeat with the other 5 nuts.
Pete
-------------------------------------
'67 1600 - frame off started in 2014. Now I know why roadster projects take so long. What a stupid idea. :smt021
'66 1600 - parts car
'66 WPL411 ***SOLD***
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Re: Differential flange nuts torque setting

Post by Toptech360 »

That's a good idea. If no leaks then I think there is no harm no foul.

I suspect the 65ftlb torque value is for the driveshaft bolts.
Dan
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Re: Differential flange nuts torque setting

Post by Gregs672000 »

65lbs would have twisted those puppies right off!
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