Take the Speedo Back Bro.

For that kind of money you could have bought a whole dashboard in the (UK) and I would insist on it working 100% like it should.

 

Yeah I emailed the spare parts guy but no response back.

My youngest son wants it now for his little sit in peddle car lol!

An expensive trinket to lop on his car!

 

Bummer. Just got my car back going and the speedo is now on the brink....again.

Currently at work for a month and not near the car but thought I'd get the ball rolling on my next repair...so.....

If you read back through this post I had a refurbished speedo with a brand new PCB retrofited inside. It was working ok but only after the first gear change. A bit of a pain but I could put up with it.

Anyway, driving along last week my speedo needle just dropped and stayed dead. I would like to think that gauge is ok but seem to recall the wiring to my speed sender was full of oil and dirt last time.

Next step when I get home is jack her up and check the wiring ...

The adventures continue...

 

Paul
If your car has the speedo signal generator stuck into the rear LHS of the gearbox, like mine, the symptoms you mentioned of not working in first gear, and then failing completely, sound suspiciously like either (a) the drive to the transducer in the box has failed, or for your sake I hope so (b) the actual transducer has failed.
Speedometer Transducer - Parts For XJS from (V)139052 to (V)179736 | Jaguar Classic Parts UK
The transducer just unscrews from the gearbox and is easily replaced, and new ones are not that dear. If the bit inside the box that this connects to has failed, I do not know if this is an easy fix or not. But I am sure those who know the insides of the GM400 will be able to tell us!
Greg

 

Cheers Greg. Yes after about 1 year of use this speedo started giving me drama. Previously I had noticed it would also fail on the return trip of a long journey...like it was heat related...I dunno... I would like to nail it. I have a feeling it will be on the transducer end....I had the dash out previously and checked all connections etc...as well as that new gauge. Nothing though has been done on the transducer end.

Just looking back in this thread, swapping out the transducer doesn't open up to baptize you with trans fluid correct? Or do I need to cap it up straight away with the new sensor before fluid goes everywhere?

Only 27 more days until I get back to my car......

 

Paul,

You will not get baptized.

The adaptor that the electrical transducer screws onto can weep some fluid when removed. There will be no oil flow when the transducer is unscrewed.

That adaptor has a Nylon gear on the end that meshes with the drive spiral on the output shaft. That Nylon gear can fail, not common. More common is the transducer itself.

 

Thanks guys. Now that I have the info I can make preparations for when I am home next month.

And as disccused in one of my other threads, whats the best way to work or get access to this section? Jack up front only and jack stands on both sides of front crossmember with rear wheels chocked? Its kinda in the middle right so I suppose either end yeah?

To be continued....

 

Hi Bro

Have you got a 3 Ton Trolley Jack?

 

Almost O.B. I am buying one when I get home.

Might order it online and have it there waiting for me but wanted to make sure it truley is low profile enough.

 

A big commercial lorry/tractor trolley jack is a great tool Paul. Try to find one like this if you can, over here, agricultural places have them:
WDK13HLQ


About 70cm lift is what is needed, 50com is not enough, IMO. Do not worry about the height when lowered, as you just drive the car up on a couple of low blocks first.
I do NOT recommend putting the car on four jackstands. Warren's system is great because the car is on all four wheels, two on a jackstand and two wheels on the ground is fine too. But with all four corners on a jackstand it is frighteningly easy to rock the car off them. Even great big lorry jackstands!
Greg

 

Green maybe, blue never! Try it without anything first though. And remove those little green bowler hats that cover the bulbs, that makes a huge difference too
Greg

 

Get the front up nice and high with the 70cm lifting jack recommended and you can get to it easily.
Greg

 

Heh guys...still out here in the but only about 4 days left.

So...I am getting parts ready for when I am home. I was going to ring Jag Daim on the Speedo Transducer. Greg, I clicked on the link you gave me and have a question. Is the DAC4569 the part number for the speedo or is it in fact the ECU it works with?

That part number looks like the same numbering system as the ECU so I just wanted to make sure I am quoting the correct part number over the phone.

Cheers for your help.

 

This is the right part paul.
http://www.jaguarclaPsicparts.com/uk/part/DAC4569
The ECU is nothing at all to do with the speedo on our models.
Greg

 

Thanks bud. I appreciate the response. So if I quote DAC4569 I should be fine?

I'll let you know how I go

 

Crikey! On the Australian version of the Jaguar Website the part is $232.58

Part no. DAC4569 | Speedometer transducer parts from Jaguar Classic Parts AU

I think I might check Jag Daim and see the price difference.

If it is that much I might double check the cabling and rule out all other possiblities before I make the purchase.

 

I am pretty sure that JD have them at about 50 quid UK, as they advertise on UK ebay. If not, check UK or USA ebay. That price looks more than double the UK exchange rate adjusted price. Still better than Doug's Ferrari 2500 USD for a set of HT leads though!
Here is a pretty good guy who will post things anywhere:
JAGUAR DAIMLER GM400 SPEEDO SPEEDOMETER TRANSDUCER FITS XJ12 XJS DS420 DAC4569 | eBay
Greg

 

Thanks Greg. Yeah it seems pretty steep a price. I tried to ring Jag Daim which is a good supplier here in Oz but the stupid number wouldn't work. I call via satellite so maybe I'll call via normal phone when I am home.

 

Paul,
Ashdown (not far from you) will havem in stock. Id be surprised if you pay over $100 for one. Take the old one with you so you can make sure it's the correct part.

Your welcome to use my jack, stands ect if you need to

Cheers
34by151

 

Cheers James. Much appreciated mate.

So the Jaguar Speedo Transducer is nothing unique?

I first have to get myself under there (with jack stands) to double check that it isn't just the wiring. I remember I looked at it a few years ago and had to clean it up a fair bit.