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Douglas 1913 Model P motorcycle

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Douglas 1915 3 Spd-Gearbox and Clutch

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Dave

2025-01-07, 19:16:39
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Dave

2024-06-11, 21:02:05
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Dave

2024-06-08, 19:30:04
For Sale
xman has two very nice 1950's machines available - a green 1950 mk4 and black 1951 mk5 - both in good condition and running well.

Dave

2024-06-07, 03:13:36

Dave

2024-06-03, 09:23:05
For Sale
Duncan has just listed his green and cream 1957 Dragonfly for sale with spares and documents.

Dave

2024-06-02, 09:34:05
Parts avalable
alistair still has parts available - barrels, carburettor, castings - see all listings.


Dave

2024-06-01, 19:33:27

Dave

2024-05-28, 01:09:46
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1934 forks

Started by saluki42, 25 Jul 2021 at 11:26

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saluki42

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?

EW-Ron

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 ?

Daren W Australia

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!

eddie

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.

EW-Ron

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).

saluki42

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

EW-Ron

Are there numbers on those races ?

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

saluki42

Careful work with very fine wet and dry may remove the surface rust enough to see any numbers hopefully