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Douglas Motorcycles - General Discussion / Re: Headstock Bearings for S6/T6?
« Last post by Doug on 11 May 2019 at 03:18  »
The A, B, C, ... refers to the interchangeability table; see here:



When I faced a similar head stock bearing problem with my F28 (600EW), I was able to use a pair of slimmer taper roller bearings. To make up the difference, adapters were turned on the lathe. I think I only needed an adapter for the outer race diameter and height. I did a similar thing for my Birmingham Scott that had indented races. But there I was changing from loose ball to a taper roller bearing. The size was more of a challenge but I was able to use special taper roller bearings made to convert older BMW twins. Even so, adapters needed to be made, which were made to look like the old ball races and disguise the modification.

-Doug
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    Good evening
    ' All information is good '
        Have fun in the rebuilding
Jonathan
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Douglas Motorcycles - General Discussion / Headstock Bearings for S6/T6?
« Last post by PaulW on 10 May 2019 at 18:36  »
My recently acquired T6 has headstock bearings that are very "notchy" and steering feels awful and dangerous.

Having dismantled the headstock, I see they are taper rollers with an OD of 54mm and an ID of 27mm; (width about 16mm);  they also have some very heavy grooves in the shells which are the cause of the terrible steering.

According to my bearing catalogues, this seems to be a non-standard size, so what have other owners done?  Is it a case of sleeving / grinding a standard taper roller bearing, and if so, which one?  Or has the club had any made?

While I'm posting, my parts list seems to be missing the first few pages, so I'm having problems working out what "A", "B" and "C" means in the column just before the price column.

Thanks for any help.

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Douglas Motorcycles - General Discussion / Re: EW guides
« Last post by tck on 10 May 2019 at 17:29  »
If someone could please tell me the valve seat angle for the EW 350 it would be a start, it looks like 30 degrees none of my books have it
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For Sale
Dragonfly crankshaft. Stripped and cleaned,centre section
re-assembled,Good journals,New big end rollers. Problem - only one bigend roller cage. Hence 320 including U.K.Postage. EMail me (N.C.R. May/June page36)
Neville
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Douglas Motorcycles - General Discussion / Re: Gearbox drain plug thread
« Last post by isettaman on 10 May 2019 at 08:37  »
Great, Eddie
That's what I suspected and I'm glad that you have confirmed it.
Many thanks
Dave
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Douglas Motorcycles - General Discussion / Re: Gearbox drain plug thread
« Last post by eddie on 10 May 2019 at 07:26  »
Yes Dave,
                 The thread is 1/8"BSP - that is .383"dia x 28 tpi. If you need a new plug, they are available from plumbers merchants, but need the flange turned down so that it just clears the bottom of the gearbox side cover.
  Hope this helps,
                            Regards,
                                           Eddie.
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Douglas Motorcycles - General Discussion / Gearbox drain plug thread
« Last post by isettaman on 09 May 2019 at 23:18  »
Hi All
Can someone tell me the thread size of the gearbox drain plug on my 80+?
The diameter is 3/8, I believe, but the thread is too fine for BSF.
Any thoughts?
Many thanks
Dave
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Has anyone got any of the following please?
 
They are for a 600 but I think the smaller capacity models shared the same parts, and different earlier 30's bikes used the BTH Ammeter.

Primary drive rear cush hub assembly & associated sprocket.
Primary drive outer cover.
BTH Ammeter.

Condition unimportant.
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Douglas Motorcycles - General Discussion / Re: Aero 600 Engine re-assembly
« Last post by Aero on 09 May 2019 at 20:33  »
This is a pic of the assembly order just in case anyone ever needs it for future reference.
I'm just waiting on the one main bearing to be delivered before I can reassemble the engine. Is there any interest in documenting the rebuild on here?
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