TVR S2 Speedo sensor fail.

[ChrisCollinson1]

My TVR S2 speedo dial is working when attached to an electric drill that drives the sensor, but the speedo sensor helical gear tooth is damaged and doesn't work reliably when connected to the gearbox.
Anyone managed to lay their hands on a replacement helical gear and/or an S2 speedo sensor? Motaclan parts say there is zero chance of a replacement unit
(even thought it is supposed to be based on a Ford Granada sensor which you would have thought would be plentiful...)
At present my plan is to remove the entire sensor unit and reverse engineer a replacement helical gear from a local machine shop.

[mentall]

There are lots of Type 9 'box speedo drive gears on eBay, with 22/23/24/25 teeth. No use?

[ChrisCollinson1]

Hi, It's a type N gearbox. The MT75 was fitted a bit later and is the exception rather than the rule according to Steve Heath's manual.
Presumably a series 9 gear won't fit.

[mentall]

Type N and Type 9 are alternative names for the same series of gearboxes

It was fitted to all the V6 S series cars (except maybe the S4, which shared its chassis with the V8S).

[ChrisCollinson1]

Aha! Many thanks for that. Confusing that an N gearbox is actually a type 9 .
Should help with the quest to get a replacement working speedo.
I've bought a GPS speedo in the meantime as a quick workaround , but I want to get the proper dial speedo working.

[RayTVR]

mentall said:

It was fitted to all the V6 S series cars (except maybe the S4, which shared its chassis with the V8S).

I don't believe the MT75 was ever fitted to S series cars. MT75 has reverse right and down (where 6th would be) and the S4 cars I've seen have the normal Type 9 pattern with reverse left and up past first.

[mentall]

That makes sense. Thanks.

[phillpot]

Every V6 S had the type 9 (the N designation is rarely used)
I suspect the selection of gears mentioned previously are for earlier cars with cable drive speedo?
The transducers used for electronic speedometers are rare, thought I had a spare but buggered if I can find it?

Edited by phillpot on Friday 21st June 08:43

[fozzy280472]

phillpot said:

Every V6 S had the type 9 (the N designation is rarely used)
I suspect the selection of gears mentioned previously are for earlier cars with cable drive speedo?
The transducers used for electronic speedometers are rare as hens teeths,thought I had a spare but buggered if I can find it? Possibly lent it someone to prove theirs good or bad and it never came back?

Mike , you sold it to me last year.

[phillpot]

fozzy280472 said:

Mike , you sold it to me last year.

Ah! That could explain why I can't find it

I must have been feeling generous, surprised i let it go they are so hard to find.

Edited by phillpot on Friday 21st June 08:45

[fozzy280472]

phillpot said:

fozzy280472 said:

Mike , you sold it to me last year.

Ah! That could explain why I can't find it

I must have been feeling generous, surprised i let it go they are so hard to find.

Edited by phillpot on Friday 21st June 08:45

Yes I was surprised you let it go , we had a gentlemans agreement that if I didnt use it and you needed it you could have it back for what I paid you ,
Unfortunately it's now on my S3 so wont be coming back ! Fixed my speedo issue tho .

[phillpot]

fozzy280472 said:

It's now on my S3 so wont be coming back ! Fixed my speedo issue tho .

That's all that matters