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Hello all.
Hopefully all you clever people can help me with this question...

I have just acquired a gearbox, A+ DAM2886 (big idle gear). I'm trying to figure out if it's a close ratio.
The layshaft is stamped DAM3??? It's not clear, but the bits of letter could read DAM3168.
The first motion shaft has a 17 tooth first gear.

Now.... I know the close ratio had an 18 tooth gear, 22G1040 on the A-series boxes, but did the DAM boxes also have this?
I have had loads of A+ gearboxes, but have never, ever seen a laygear on a 'normal' A+ gearbox with a DAM number stamped onto it, ever.

I just can't quite make out the full number on it, but it's defiantly DAM3???

So... What is this gearbox, close ratio or not.... oh, its was not on a 1275 engine, but it was from a bitsa engine that had some 1275 parts (timing cover, clutch housing), so not an original engine.

Discuss.....

The Late 1275GT had the A+ Close Ratio Gearset fitted. Same ratios as the all Synchro Cooper S.

The First Motion Shaft did take the 18 mm Needle Roller and was 18 tooth. This was a DAM3167. The Laygear took the 2 step type Layshaft, this was a DAM3168. The Laygears are fairly thin on the ground.

I suspect with your 17t First Motion Shaft, it's a standard ratio gearset, in A+, these had a DAM3169 Laygear.

Hi Tim
I have a couple of standard 3 step laygears stamped DAM3169, don’t see a lot of them but they do exist. The close ratio A+ with A series tooth profile are the part numbers Chris has detailed, All close ratio have 18T first motion.

I have never seen A+ laygears, standard or economy with a part number stamped.

Regards Jason

Jason wrote: ↑Thu Jul 04, 2024 9:54 pm Hi Tim
I have a couple of standard 3 step laygears stamped DAM3169, don’t see a lot of them but they do exist. The close ratio A+ with A series tooth profile are the part numbers Chris has detailed, All close ratio have 18T first motion.

I have never seen A+ laygears, standard or economy with a part number stamped.

Regards Jason

Hello Jason.

Thanks for the reply, appreciate it.

It's definitely a 17 tooth first motion, counted it again and again. It was odd as the laygear is clearly stamped DAM3??? It just looked like a close ratio laygear, really odd as you say, I have NEVER seen a 'standard ' laygear with a part number stamped.

I knew it was not a close ratio, they are ALL 18 tooth. It's just a odd one....