Oddometer stop turning.

[dean1057]

Out yesterday in the 3.2 lightweight and noticed the miles haven't moved at all and neither does the trip counter although the MPH needle still works.
I've read up that it's probably a small plastic gear in the clock and it's a small fidley job to sort.
Who's the best person to send it to???

[Bootsy]

Got the same issue in my 993 - must get it sorted!

[210bhp]

JohnM illustrated a similar repair to this on a very comprehensive thread with pictures some time ago on ddk. Can’t remember if it was mileometer or clock repair but a small white cog was involved somewhere.
A search should find the thread.

Regards
Mike

[kitesurfer2]

Try John at JDO instruments

[Fuchs915]

Just doing this repair on a 924 speedo for my kit car. Not that fiddly to do on the 924 speedo, just need a bit of patience and work methodically through the movement. Parts can be a bit spendy for a small plastic part though


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[majordad]

The exact same happened to my 1972 S Speedo yesterday, MPH still,works fine , numbers stopped n

[KS]

Easy job to fix - can do it on your kitchen table in an afternoon. Here are some photos I took when I fixed the one from my Carrera:


Extracting the speedometer requires a degree of manual dexterity – removing the clock first helps as it allows you to get a hand in to release the cable


The cable for resetting the trip-meter simply pushes into place in the rear of the unit. You must remove it before you go any further with the disassembly


Using a small screwdriver, gradually work your way round the turned edge of the instrument bezel, carefully bending it back to release the glass


This is what you find when the bezel is removed. The glass is sandwiched between the bezel itself and the white spacer ring seen here


Turning the speedo over, you’ll need to undo a couple of small screws – they are paint-marked, so it’s easy to see if anyone has tampered with the gauge before


The point of no return – the workings are quite delicate and you must be careful not to damage the speedometer’s face or needle


This is the gear which connects the main odometer to the trip-meter. The plastic skew gear is prone to failure if you try to reset the trip-meter on the move


This is the small alloy gear which drives the main odometer. It is an interference fit on a shaft – and thereby lies the problem, as we shall see


The white plastic gears at the other end of the odometer can strip their teeth, so take a close look at their condition before proceeding any further


Time to investigate further. Next, you need to remove the main aluminium cable drive unit – it’s held in place by a pair of small brass screws


One positive aspect of this job was to discover that the instrument had never been in pieces before – all the factory-applied paint seals were still in place


Now you need to release the odometer from the main gauge face – two small screws can be found between the odometer and trip-meter


Now’s the tricky part – use some masking tape to hold the odometer’s number ‘drums’ together before removing them. You can then slide them off the main drive shaft once the drive gear has been removed


By taping the drums together, you make sure the mileage stays the same. Needless to say, you could set the mileage to whatever you choose at this point…


Our odometer failed because the tiny aluminium drive gear had been slipping on its shaft. Make sure you don’t lose it – and note which way round it fits


I chose to roughen the end of the drive shaft with a pair of pliers in the hope that the gear would then be a better interference fit when replaced. It worked!


Reinstalling the drums and pushing the gear onto the shaft is a nerve-wracking business, but if you take your time, you’ll be OK. Make sure the numbers are aligned correctly


Job done! One sure way to see if a car has been ‘clocked’ in an amateurish way is to check if the odometer figures are lined up correctly, or not. A rushed job will mean the figures remain out of line

[majordad]

Thanks, that looks easy, but experience tells me it’s not !

[911hillclimber]

Happened to me about 10 years ago.
Sent it to Julian Reep (think that is right) and he did it in 5 days and £60 iirc.
I think there are several ratios of the gears for some reason.

[KS]

Thanks, that looks easy, but experience tells me it’s not !

If I managed to do it, anyone can!

[dean1057]

Thanks Guys for the replies. First job I’ll get the clock out and decide if i do it myself or send it out.

[ch3tman]

Thanks Guys for the replies. First job I’ll get the clock out and decide if i do it myself or send it out.

Have a look here, it's for a 993 but must be similar (hopefully simpler) in your 3.2?

https://www.youtube.com/watch?v=c4XOxU3EJ40

Step by step instructions here:

http://p-car.com/diy/odometer/

Finally, if you want to send it off, this is the place I've bookmakred, widely recognised as the go to:

http://www.reapautomotivedesign.com/

[jtparr]

Great post Keith...mine has been suspect for a while now....I reckon it’s something I can fix now I know what’s involved...

[dean1057]

Chickened and sent it to Jdo instruments. Super swift service and sent me the old crumbled gear back.


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[Bootsy]

Can you PM me their details are if I try and do it I'm liable to balls it up