The Gearbox identification page has been updated. You can find this information on the "Technical info" page.

Thanks Neale.

Henk

email (option): ahum@quicknet.nl

Very useful blurp!

Thanks a bunch Neale.

email (option): unpob@yahoo.com

Tom GREETS from Poland contacted me recently re an unusual gearbox in his WM20.

Tom's main shell/housing has casting number 66-3030 clearly visible on upper surface behind clutch arm, all other shells have different casting number located on underside.
Tom's corresponding outer cover 66-3103 has casting number inverted,
does not have groove for rubber boot at clutch arm. All other outer covers have different casting number.

I have never seen nor heard of a gearbox with casting numbers such as Tom's.

I will now have to update my gearbox page in tech section.

Has anyone else found gearboxes with these unusual casting numbers?

Are there other single cylinder heavyweight gearboxes not listed in my I D page?
Did the part numbers remain unchanged?

I suspect Tom's gearbox may be very late war production, but I have no records to confirm.

Possibly made by someone contracted to BSA? In case of problems, the easily viewed shell number used to quickly identify?

Where are the instructions for posting pictures?

Cheers

Neale

Upload your photos to a site like www.photobucket.com. Use from the codes given the HTML code, copy that and past in your forum post.

Henk.

email (option): ahum@quicknet.nl

Re previous post and pictures below:
Has anyone else found gearboxes with these unusual casting numbers?

Cheers
Neale

email (option): n.gentner@bigpond.com

Hello Neale.Are you still looking for casting numbers? One of my boxes has the casting No on top behind the clutch arm and 2 or 3 outer covers have 66-3103 cast on the inside.Two of the outers olso have the extra machining around the 4 lower screw holes and are secured with studs and those special BSA nuts like C11 cases.All came off WD bikes.About 95% of WM20 bikes shipped out to Australia fell between the 41000 to 79000 number range.Hope this helps,Sam.

email (option): smarwick@iprimus.com.au

Hi Sam,

Thank you for your reply,
Yes, still trying to sort it out, I found another shell with number on top here in OZ.

I don't suppose you have a parts list that covers the studs, nuts and modified cover?

Also chasing a drawing of front brackets for universal saddle (66-9195 & 66-9196)

email (option): n.gentner@bigpond.com

Hi Neale,
I've just had a look at four shells I have here, Two WD and two post war.
The WD shells are as you state, one JHL 66-3030 the other completely blank.
One post war shell is PBM 66-3141 but the other is as the '48 with JHL and no oil seal but with the casting number 66-3127 running vertical at the back of the rear mounting lug. This is not the first shell I've seen with this vertical number.
Just wanting to contribute the data base.

email (option): spacemonkeym@gmail.com

Thanks Matt,

The vertical number and post war shell without seal are new to me, can you PM me some pics?

email (option): n.gentner@bigpond.com

Hi Neale..Early versions of the rigid M and B Series 'telefork' heavyweight boxes didn't have the oilseal. I think this was for a fairly short period as I haven't found that many and have had a lot of these boxes pass through my hands...I haven't checked the parts lists for this feature but I would guess at maybe only 48 and 49...Ian

email (option): ian@wright52.plus.com

Ah yes, I knew about the post war box without seal, mentioned in my original gearbox article.
The vertical number was new to me, but on closer inspection I have 3 post war shells without seals and all have the vertical number, albeit very faint.

So when did the WD type box change from screws along bottom of outer cover to studs and shoulder nuts similar to post war box? As seen in BSA Service Sheet 602 which is dated 1949.

email (option): n.gentner@bigpond.com

I would have thought it was 1948, when the 'later' box was introduced. At that point there might have been a standardization of fixings between the two types?....Ian

Bonsoir
Fan de vieilles bécane je possède une boite a vitesses JHL 66 3030
pour contact jm.rigaud@sfr.fr
Cordialement j-marc

email (option): jm.rigaud@sfr.fr

Hi Neale

My gear box outer cover as the following inside

66-3064 D

3064 is crossed out and replaced by 3103

Best regards

Jo'b

email (option): Jonnyob1@googlemail.com

Hi,

are you that Neale Genter who is looking for informations about the Research Brakes used by Beardmore Precision? I have a original sales brochure of the TT model with these Brakes. They look like modern disc Brakes.

with Kind regards Robert

email (option): robert.pfarrhofer@aon.at