Differential Fixing Threads

Technical advice Q&A

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cm3
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#1 Differential Fixing Threads

Post by cm3 » Sat Mar 28, 2020 6:35 pm

Can anyone tell me the threads that fix an early e-type diff into the car please? The upper top 4 bolts want to be M12 x 1.75. But this doesn't seem right. 1.75 is around 14tpi - but then there isn't a 1/2" x 14tpi thread.

The lower 4 bolts (2 on each side) are almost 7/16 UNC. This would seem to be a mistake and they're more likely to be 7/16 BSW - is this correct?

Thanks - I'm trying restore a special which has been badly assembled. Oliver

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Tom W
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#2 Re: Differential Fixing Threads

Post by Tom W » Sat Mar 28, 2020 6:46 pm

Definitely not metric. UNC from memory of when I swapped my diff over, but that was a couple of years back.
Tom
1970 S2 FHC

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rswaffie
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#3 Re: Differential Fixing Threads

Post by rswaffie » Sat Mar 28, 2020 8:01 pm

If you mean the 8x shouldered bolts with locking wire holes, they should not be metric as Tom points out.
When I rebuilt mine, I got a new set from SNG, part no c.17024 - all the same thread.
Richard

S1 3.8 FHC Opalescent Golden Sand with Tan Trim 889504
Now running-in my diy nut ‘n’ bolt restoration. :wrench: :hammer: :fingerscrossed:

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cm3
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#4 Re: Differential Fixing Threads

Post by cm3 » Sun Mar 29, 2020 8:58 am

Thanks both for the replies. It looks like the stub axle fixings are UNC - so I assume the whole diff casing is UNC. I don't know how someone has stuffed M12 into the top bolts. My challenge here is that every bolt is a different length to a standard e-type on this car, so bolt kits won't fit. Cheers. Oliver

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MarkRado
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#5 Re: Differential Fixing Threads

Post by MarkRado » Mon Mar 30, 2020 7:28 am

I have a rear suspension on my bench at the moment (with type C axle)
the lower fulc bracket bolts are 7/16 UNC, the short ones have 1/2 , the longer ones 3/4 thread lenght (approx).
The 4top bolts are 1/2 UNC x 3/4.
Mark
1963 OTS 880436

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Mich7920
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#6 Re: Differential Fixing Threads

Post by Mich7920 » Mon Mar 30, 2020 8:59 am

Hi Mark,
Download the SC E Type catalogue, nearly all the screws are specified.
Very helpfull !
Mich
Michel
1965 E Type FHC - On the road - 1963 E Type OTS - Angus Restoration
Gran Torino Sport 1975 - Renault 4cv 1956 - CItroen 15/6 1951 - CItroen Traction 1945
Citroen Coupé docteur 5Hp 1924 - Citroen B12 1926 - Torpedo Sygma 1913
Harley D. 1915 sidecar

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MarkRado
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#7 Re: Differential Fixing Threads

Post by MarkRado » Mon Mar 30, 2020 11:25 am

Thanks for the info, did not realize that before, would be a nice to have feature on the SNG website :wink: . Nevertheless it might be of help for Oliver, since I measured thread lenght only (without cone) as I understand that he rebuilds a special which might use the axle (diff) only, fastened with non Jaguar bolts.
Mark
1963 OTS 880436

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abowie
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#8 Re: Differential Fixing Threads

Post by abowie » Tue Mar 31, 2020 2:09 am

Mich7920 wrote:
Mon Mar 30, 2020 8:59 am
Hi Mark,
Download the SC E Type catalogue, nearly all the screws are specified.
Very helpfull !
Mich
I can't find a link to a S1 catalogue. Any suggestions?
Andrew.
881824, 1E21538. 889457..oops. Jezza the V12 XJS race car.
http://www.projectetype.com/index.php/the-blog.html
Adelaide, Australia

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mgcjag
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#9 Re: Differential Fixing Threads

Post by mgcjag » Tue Mar 31, 2020 7:43 am

Here you go Andrew https://www.scparts.co.uk/sc_en/british ... aguar.html select Jaguar then model then menu of left to drill down further hard copy is available from SC or on ebay well worth getting...lots of info in them..Steve
Steve
1969 S2 2+2 & Building a C type replica

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Mich7920
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#10 Re: Differential Fixing Threads

Post by Mich7920 » Tue Mar 31, 2020 7:59 am

I spoke about this parts catalogue but :
I don't find the link for downloading. I did it but don't remember how !??
Image

Somebody have it ?
Michel
1965 E Type FHC - On the road - 1963 E Type OTS - Angus Restoration
Gran Torino Sport 1975 - Renault 4cv 1956 - CItroen 15/6 1951 - CItroen Traction 1945
Citroen Coupé docteur 5Hp 1924 - Citroen B12 1926 - Torpedo Sygma 1913
Harley D. 1915 sidecar

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