Author Topic: 1934 forks  (Read 407 times)

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Offline saluki42

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1934 forks
« on: 25 Jul 2021 at 10:26 »
Hi does anybody know the sizes for the upper and lower taper roller bearings that were likely to have been used in the steering head of my Model Z?

Offline EW-Ron

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Re: 1934 forks
« Reply #1 on: 27 Jul 2021 at 01:01 »
It would be unlikely that 1930s bikes would have tapered roller steering head bearings ?
They'd be plain races, and loose ball bearings - well greased.

What does your parts book say.
If you are lucky, it will state the number, and even size, of the balls.

There may be tapered types that could be fitted as a conversion,
but generally these are bulkier and require stuff to be machined to suit.

What does your frame have at present ?

Offline Daren W Australia

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Re: 1934 forks
« Reply #2 on: 27 Jul 2021 at 03:37 »
Hi Ron my 1927 600sv has Timken taper bearing top and bottom Douglas used them a lot Ta Daren
too many dougli not enough time!

Offline eddie

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Re: 1934 forks
« Reply #3 on: 27 Jul 2021 at 06:28 »
Yes, the road going OHV's changed to taper roller head bearings in 1931 (necessitating a change of head lug to suit). You should be able to work out the bearing sizes by measuring the inside diameter of the headlug and the diameter of the fork stem - that just leaves the width of the bearing (which can be adjusted with spacers if the correct width is no longer available).

      Eddie.

Offline EW-Ron

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Re: 1934 forks
« Reply #4 on: 27 Jul 2021 at 07:58 »
I find that surprising.
So Douglas used tiny little tapered rollers in the wheels (EW wheels anyway)
and whacking great tapered rollers in the steering head in some models. ?

They must have got a good deal on the buy-in price ... !

Never mind that the EW wheel bearing size is now obsolete,
and you can't buy them for love nor money. (reasonable money anyway).

Offline saluki42

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Re: 1934 forks
« Reply #5 on: 27 Jul 2021 at 08:09 »
Thanks for all your replies on this matter, I've now found in the big box of rusty bits I call parts the inner and outer races of the upper taper bearing which will give me a start. Again thanks to you all

Chris

Offline EW-Ron

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Re: 1934 forks
« Reply #6 on: 27 Jul 2021 at 09:59 »
Are there numbers on those races ?

With numbers in hand, you can determine if they are still available,
or are any modern equivalents.

Offline saluki42

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Re: 1934 forks
« Reply #7 on: 27 Jul 2021 at 10:23 »
Careful work with very fine wet and dry may remove the surface rust enough to see any numbers hopefully