Correcting Speedo

map1275 · Post by **map1275** » Mon Dec 29, 2008 12:16 am

As per the previous postings: refer to the parts book.

Obviously Rover kept the tyre size as the defining factor which for us is 7.50 x 16. Why make it any more complex? For the average person, the SNT only becomes a means of confirming that no one has buggered with the speedo.

What some one could do within this group would be to compile a list of the correct speedos:
Rover part number
Markings on face
Jaeger/Smiths code number
and if you really want, the rpm.

Just having looked at both of my speedos for the SNT;

Original
6209/25
Replacement
6209/35 (no markings on face, sticker on side)

If all is correct, have you checked your gearbox or diff serial numbers to see if they have been swapped?

Davo · Post by **Davo** » Mon Dec 29, 2008 3:17 am

I have a Stage I speedo drive pinion I've just had a look at and it has 20 teeth on it. The worm gear, which is a bit harder to describe, has 5 teeth across at an angle of about 10 degrees. Hopefully that will help someone trying to identify a part.

So, to clarify:

A Stage I speedo head is the same as any other SIII 109" speedo for 7.50/16 tyres.

It's not the same as one for an 88" with 6.00/16 tyres, or the 109" 1-ton with 9.00/16 tyres.

Now, I think I've got that right?

map1275 · Post by **map1275** » Mon Dec 29, 2008 3:33 am

Good so far and from what I understand, its the drive gears that differentiate a Stage One box from a Range-Rover (plus the gear levers and mechanism).

Bumpkin · Post by **Bumpkin** » Mon Dec 29, 2008 6:16 am

John
14MPG is about right. I can get to ther dizzying heights of 18 MPG on a run at 50 MPH with the overdrive in. Havent a clue about the drive.
Tel

John Roach · Post by **John Roach** » Tue Dec 30, 2008 7:18 pm

map1275, thanks, I think I understand at long last. Is the SNT you refer to, the four digit TPM number I was using? Might it be possible Land Rover changed this over the years as they adopted different tyre brands, with very slight differences in rolling circumference?

Anyway, decided it was far too cold to be messing around under a Land Rover yesterday, and figured I might as well wait til I have a replacement speedo drive, so had the Better Half drive at various speeds whilst I followed. I realise not going to be 100% accurate but was made a little easier as she has cruise control and a digital speedo.

Here's the results (her speedo/my speedo): 30/25, 40/34, 50/43, 60/52, 70/60. At the end of journey her trip showed 9.6 miles: mine 7.9 miles. Not quite as much of a difference as I'd hoped, but at least it wasn't just my imagination.

Tel, using the above figures, imagine how chuffed I was to calculate I got just over 18mpg from my first tank, mainly motorway, without an overdrive. Unfortunately you're right, the second tank worked out at 13mpg!

Regards,

John

map1275 · Post by **map1275** » Tue Dec 30, 2008 9:12 pm

There's no need to over think and make things more complex than they need to be.
What is the sequence written in small characters at the very bottom edge of your speedo? Or if its a later replacement, this may be on a sticker on the side of the speedo's body.
This is what's used to ID the speedo, not anything else.

John Roach · Post by **John Roach** » Sun Jan 04, 2009 8:12 pm

map1275, believe it or not I crave simplicity! Got the SNT number...6209 42. Can see part numbers are same for Stage 1's...query in my last post regarding different TPM numbers was just out of curiosity; had realized (at long last!) speedo head is not the issue with my vehicle. Thanks for your help again.

Davo, thanks for clarifying that, by the way.

Regards,

John

V8_Disco · Post by **V8_Disco** » Wed Mar 11, 2009 2:22 pm

John Roach wrote:map1275, believe it or not I crave simplicity! Got the SNT number...6209 42. Can see part numbers are same for Stage 1's...query in my last post regarding different TPM numbers was just out of curiosity; had realized (at long last!) speedo head is not the issue with my vehicle. Thanks for your help again.

Davo, thanks for clarifying that, by the way.

Regards,

John

John

I have a Stage 1 with the same issue! have you resolved yours yet?

Thanks

Aidan

John Roach · Post by **John Roach** » Thu Mar 12, 2009 2:05 pm

Hi Aidan...and welcome to the joys of Stage 1 ownership!

Not sorted it yet but am quite sure its the speedo pinion drive in the transfer box that's the cause in my case. What TPM number is on your speedo?

Regards, John

V8_Disco · Post by **V8_Disco** » Mon Mar 16, 2009 1:24 pm

Sorry dont have alot of acess to IT, Will have a look, I know its a replacment as the old one was in the back of the car!

Aidan

John Roach · Post by **John Roach** » Mon Mar 16, 2009 1:36 pm

Aidan, A few months ago I was having a chat with Richard at LR Orphanage, before he sold his Stage 1, and I believe it had a SWB speedo. If this is so, let me know, as I've got a spare 1376.

Regards, John

V8_Disco · Post by **V8_Disco** » Wed Mar 18, 2009 1:41 pm

Thanks John, Have some time to play with the truck tonight so will have a look

Aidan

V8_Disco · Post by **V8_Disco** » Mon Mar 23, 2009 10:09 am

Hi

Sorry got carried away camping with the series in the end,

but to do that I had to ply line the back, weld up a dog guard, etc how much would you want for the 1376 as its not the one in the truck,

I Put 300 miles on her in the weekend, great fun! but dissy cap is defintley on the way out

Aidan

John Roach · Post by **John Roach** » Wed Mar 25, 2009 11:19 am

Hi Aidan, sounds like some fun! A tenner plus p&p secures. I paid twenty something for it (ebay) recently, but it came with rest of dash console which I can use...so surely a bargain? I'm even up in Harrogate this weekend if any use.

Regards, John

V8_Disco · Post by **V8_Disco** » Wed Mar 25, 2009 3:02 pm

That is a done deal, how do you want to be paid!

Hum not that far from harrogage, but thats a long way for the weekend!

Aidan