Centura Diff problem

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cusso55
Posts: 49
Joined: Sun Jun 09, 2013 9:37 am

Centura Diff problem

Post by cusso55 »

Hi guys,
I have a problem with the Centura diff that I am installing in my roadster that is doing my head in.
The uni joint is bolted to the diff yoke using clamps and bolts that screw directly in to threaded holes in the yoke.
Somewhere between my shed, the paint shop and back to my shed the above mentioned bolts have been lost.
No problem you would think, just buy new bolts, but that is the problem because every bolt that I try is the wrong thread.
I have tried M6 Metric fine and coarse (which screw in about 3 threads and then jam), 1/4 inch UNC AND 1/4 inch UNF, none of them fit.
Does anybody happen to know what thread those bolts should be.
They are definitely 6mm or 1/4 inch, but what thread?
Greg N Smith
Senior Member
Posts: 1070
Joined: Thu Jan 05, 2006 1:47 am
Location: Sunshine Coast QLD

Re: Centura Diff problem

Post by Greg N Smith »

http://www.hardyspicer.com.au/PDF_Files ... e_2020.pdf

Hardy Spicer lists for a Centura -

21R 27.39 RUJ-2038 106 0.250-28 17-24Nm
1.078 RUJ-2038R 13-18ft/lb

1/4" x 28tpi

= 1/4" UNF
cusso55
Posts: 49
Joined: Sun Jun 09, 2013 9:37 am

Re: Centura Diff problem

Post by cusso55 »

Thanks Greg
For some reason the 1/4 inch UNF doesn`t want to start threading in to any of the 4 holes.
Maybe I need to run a tap through them
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Sudsy
Senior Member
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Joined: Sat Apr 08, 2006 2:59 pm
Location: Lower Mid North South Australia

Re: Centura Diff problem

Post by Sudsy »

Probably got some crap in there. Fairly sure most of those were 1/4 UNF. Just run a tap through them and it shouldn't cut any metal if just cleaning up
Regards Bob
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