Help needed, 1959 splitscreen castle nut

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BigRob
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Help needed, 1959 splitscreen castle nut

Post by BigRob » Thu Jan 24, 2019 1:41 pm

Hi

I’m after some help, I was inspecting the rear brakes on my 1959 splitty, all was good and going well, untill I put the drum back on and began to tighten the castle nut. With very little force with an 18” wrench I managed to strip the thread on the nut. The hub appears to be ok.

The problem in having is finding a castle nut that fits. The 24mm inside diameter nuts from VW heritage are far to big, and all other I find appear to be to big as well. When I measure the hub thread it measure 19.5mm. Does anyone know what nut I’m supposed to use. The van haas the reduction boxes on it still.
I was also wondering if the thread on the hub may have been re cut at some point in its history making it smaller.

Any help/ advise would be much appreciated

Rob

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type21f
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Re: Help needed, 1959 splitscreen castle nut

Post by type21f » Thu Jan 24, 2019 3:45 pm

Maybe lost in translation but I also thought axle nuts are two sizes
36mm and 46mm
Early bus is 36mm but across flats so as you say a m24 nut?

36mm head
M24x1.5
Looking at m24 nut sizes that looks like what should be the stub dims or am I wrong?

This nut size
https://www.customandcommercial.com/vw- ... sh66_2390/

If it is still on the original rgbs that is what I would have expected..

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BigRob
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Re: Help needed, 1959 splitscreen castle nut

Post by BigRob » Thu Jan 24, 2019 5:02 pm

Hi,
I was expecting it to be m24, with a 36mm outside diameter. The problem I’m having is that is seemes to be smaller than that.

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type21f
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Re: Help needed, 1959 splitscreen castle nut

Post by type21f » Thu Jan 24, 2019 5:05 pm

Yes..the obsolete parts lists lists three the middle one is for m216..
Part numbers to check..
Is the other side the same size?Image
Yes two early ones at 36mm (without collar and with shallower collar? for 1500cc engine..)
So sounds like it has been turned/ tapped down?
May explain why it galled/ stripped.
Lot of work but early stub axles with 1.39 gearing are easier to find..
Rather than the taller THING items..
Or if replacing nut will need to establish size n pitch..
1965 Type21f
Westfalia Hamburg Type155i 003 viewtopic.php?f=8&t=64012
1965 Devon Caravette, L360 L289 Hammock, Tent, M W Pop
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BigRob
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Re: Help needed, 1959 splitscreen castle nut

Post by BigRob » Thu Jan 24, 2019 5:30 pm

Just been and checked. The other one is bigger and the new M24 36mm outside diameter nut fit just fine.

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Re: Help needed, 1959 splitscreen castle nut

Post by type21f » Thu Jan 24, 2019 5:33 pm

OK..
So decision work out what it has been reduced to and find a nut or strip n replace!
Sounds like an M20 castelatted nut?
What is the Across Flats size of the stripped nut as a start..
Is it Imperial or metric?
If a US bus could be US thread sizes..

Sure I have a stripped pair of early stub axles from vwjim.. but 100 miles away from me to look.

You will love the next question..If you choose to go down the change the stub axle you will need to know what you have..
Do you know if the rgbs are original 1.39 ratio or taller 1.26 ratio.
18/25 or 19/24 ratio?


Image

From a 62 ish early ratio..count the teeth by removing the fill plug marking and rotating and counting the teeth.Image
1965 Type21f
Westfalia Hamburg Type155i 003 viewtopic.php?f=8&t=64012
1965 Devon Caravette, L360 L289 Hammock, Tent, M W Pop
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Peebles 1964 Devon Caravette Gentlux Pop


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BigRob
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Re: Help needed, 1959 splitscreen castle nut

Post by BigRob » Thu Jan 24, 2019 6:45 pm

Just measured the stripped nut size and it is 20mm on the inside and 33.5 on the outside

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type21f
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Re: Help needed, 1959 splitscreen castle nut

Post by type21f » Thu Jan 24, 2019 7:42 pm

Is that across flats?
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Re: Help needed, 1959 splitscreen castle nut

Post by vwJim » Thu Jan 24, 2019 7:44 pm

Sounds like the best option is fit a new stub shaft. Then it'll be back to the OG strength and won't have this problem in the future.

I think I've one set of small nut reduction boxes going spare.
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BigRob
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Re: Help needed, 1959 splitscreen castle nut

Post by BigRob » Thu Jan 24, 2019 8:04 pm

It was measured across the now flat inside edges of stripped nut.

If I can’t find another but it might be better to replace.


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Re: Help needed, 1959 splitscreen castle nut

Post by BigRob » Thu Jan 24, 2019 8:07 pm

vwJim wrote:
Thu Jan 24, 2019 7:44 pm
Sounds like the best option is fit a new stub shaft. Then it'll be back to the OG strength and won't have this problem in the future.

I think I've one set of small nut reduction boxes going spare.
How much would you want for them?


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BigRob
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Re: Help needed, 1959 splitscreen castle nut

Post by BigRob » Thu Jan 24, 2019 8:33 pm

type21f wrote:
Thu Jan 24, 2019 5:33 pm

Sure I have a stripped pair of early stub axles from vwjim.. but 100 miles away from me to look.

You will love the next question..If you choose to go down the change the stub axle you will need to know what you have..
Do you know if the rgbs are original 1.39 ratio or taller 1.26 ratio.
Your right I have no idea of the size, if I cant find a nut, I will strip it and count the teeth. It might be best to go back to stock,

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Re: Help needed, 1959 splitscreen castle nut

Post by type21f » Thu Jan 24, 2019 8:41 pm

Do not need to strip..
If you remove the fill plug you can see the teeth!
Wipe with cotton bud, mark with paint on side n rotate..not easily done but possible..easy off the bus!
Last edited by type21f on Thu Jan 24, 2019 8:41 pm, edited 1 time in total.
1965 Type21f
Westfalia Hamburg Type155i 003 viewtopic.php?f=8&t=64012
1965 Devon Caravette, L360 L289 Hammock, Tent, M W Pop
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Peebles 1964 Devon Caravette Gentlux Pop


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BigRob
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Re: Help needed, 1959 splitscreen castle nut

Post by BigRob » Thu Jan 24, 2019 8:48 pm

Can I get to the fill plug buy taking the wheel off?

Sorry for the newbie question I’ve only had it for two weeks, and it’s by first one too.

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type21f
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Re: Help needed, 1959 splitscreen castle nut

Post by type21f » Thu Jan 24, 2019 9:20 pm

We were all newbies once..! Location of plug.. in rgb housing.
Item 23.
Jack up support but need to be able to rotate the brake drum.. Image
1965 Type21f
Westfalia Hamburg Type155i 003 viewtopic.php?f=8&t=64012
1965 Devon Caravette, L360 L289 Hammock, Tent, M W Pop
Image
Peebles 1964 Devon Caravette Gentlux Pop

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