Broken Marina Wheel Stud

Post by **ET_in_black** » Sun Nov 01, 2009 4:04 pm

Hi All,

A few weeks ago I was getting ready to go to the MOT, just putting the front wheels back on, and one of the front wheel studs sheared off. I've got Marina disc brakes, using the original hubs and studs, and so far I've had no joy trying to find a replacement wheel stud. The problem has been finding some with the same number of splines.

I've attached a picture of various wheel studs for comparison.

In the picture, these are the various dimensions:
A = Total length of stud (in mm)
B = Length of threaded portion (in mm)
C = Diameter of splined portion (in mm)
D = Length of splines (in mm)
E = Number of splines

These are the studs in the picture:
1 = The broken Marina Wheel Stud: A=37, B=22, C=13, D=4, E=41
2 = Some studs I bouught on eBay which said they were for a Minor Rear Axle, but in the picture looked more like Marina studs: A=36, B=20, C=13, D=6, E=47
3 = Some Triumph wheel studs I bought on eBay, equivalent to OE part number 158729. On the Caterham cars website these are listed as fitting Marina: A=34, B=20, C=13, D=4, E=29
Also for comparison/interest:
4 = Normal Minor Wheel Stud: A=31, B=18, C=10, D=8
5 = Replacement stud bought from one of the MM traders: A=35, B=24, C=10, D=6

All of these studs have a thread of 3/8 UNF.

So can anyone tell me:
Is No.1 actually a Marina wheel stud?
Do you know where I can get a compatible replacement?

Hope someone can help!
Thanks,
Ed.
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Post by **GAS** » Sun Nov 01, 2009 4:19 pm

try triumph studs, dolomite,spitfire that kind of stuff

Post by **ET_in_black** » Sun Nov 01, 2009 5:02 pm

Hi Gas,
Thanks for the reply. I already tried getting some Triumph studs - this is number 3 in my picture. They would be a very good match apart from thr different number of splines - 29, whereas the broken stud that I removed has 41.
Ed.

Post by **bmcecosse** » Sun Nov 01, 2009 5:05 pm

If it's still a snug fit in the hub - just use it! It may be as near as you can get.

Post by **ET_in_black** » Sun Nov 01, 2009 5:43 pm

Hi bmc,
Thanks for the reply. I didn't want to try fitting a stud with a different number of splines, I was a bit worried I'd end up knackering the hub, and then I might end up with a bigger problem! Or do you think it would be OK?
Ed.

Post by **bmcecosse** » Sun Nov 01, 2009 6:24 pm

I can't say for certain - you obviously need to use your own judgement whether it will grip enough to resist turning inthe hub when you tighten up! And later on - when you need to loosen. If one stud snapped- - what state are the others in ??

Post by **ET_in_black** » Wed Dec 09, 2009 6:47 am

Thanks all for the various bits of advice, and it turns out you guys were right.
After more searching for studs, and discussing with a few other people, it seemed that I didn't need to worry so much about getting an exact match on the number of "splines" or "ribs" on the stud. I had been worried about this but it seems I didn't need to be. The important thing was just to make sure the diameter across the splines was OK, then it would "recut" the hub to fit. So, replacement stud installed easily enough, and I can torque the wheel stud up OK.
However, while bleeding the brakes, I found that the master cylinder is leaking! Always something else to do! ...
Ed.