[phutton]

As everyone has said, this is a Sunbeam 4-speed box. The AU 520 series first appeared on the 1935 Model Year machines, and was used on all models.

Sorry for late response, but I've been away.

P.

[singleminded]

do you mean where the operating arm fits the gear selector shaft on the outside of the gearbox?.
My understanding is that there should be a leather washer under the large hollow nut and that gets tightened to compress the leather to form a seal..John

[Exstress]

Thanks Vic, it is a 4 speed.

Is it good news that its a Sunbeam gearbox rather than a Burman?  Are selector shaft seals available to purchase anywhere, I have quite a leak from mine.

Thanks, John

[VicYouel]

Definitely a Sunbeam box and likely to be 4 speed.
Vic

[Exstress]

Thanks Vic,

Hope you can see enough of the gearbox on this shot.

Regards

John

[VicYouel]

Sounds like a Sunbeam box from 1934/5 Can you post a picture?
Vic

[Exstress]

Hello,

Could anyone help with dating my gearbox please.  I have been online and cannot find any models of Burman that look anything like mine.  I have a bad oil leak from the gear selector bush and wondered if I could remove the front plate safely without all the internals jumping out!

The gearbox is marked AU/520/0/L642

Thanks and regards

John.