Odometer stopped

[grommett]

Apologies if this has already been covered. The odometer in my MY’87 has stopped working. Speedo is ok. I seem to remember some time ago reading on a 944 forum that there is a gear that breaks? Any info would be handy, obviously I would like to get any parts ready before I pull it.
TIA

[KS]

The gear rarely actually breaks - it is an interference fit on its shaft, and begins to slip. Repair is pretty easy and can be done on the kitchen table – either using a replacement set of gears or, as I did many years ago, simply by roughing up the shaft so the gear didn't slip. Here's a link to a DIY feature which details the procedure and also includes repairs on other gauges:

http://www.pelicanparts.com/techarticle ... repair.htm

[grommett]

Hi Keith. From your description it sounds like a one-way gear?

[dean1057]

Very fidley job uncrimping and opening the clocks that's on a air cooled 911, I've had a few go in my time and always let Steve do it at JDO instruments.
Only a small gear that goes that's cheap enough but I wouldn't want to damage the clock as replacements are expensive.
http://www.jdo1.com/contact_details.html

[keith fellowes]

My odometer has stopped and I've been wondering what to do. Being fairly ham-fisted at times I didn't fancy following the pelican parts tutorial!
Thanks for the heads up on JDO Instruments

[dean1057]

It was only around 3 weeks ago my odometer stopped in the 964, posted it off special delivery and was back in around 3 to 4 days.
Real fast turnaround at JDO.

[neilbardsley]

JDO good value and a quick turnaround

Sent from my 22011119UY using Tapatalk

[keith fellowes]

Sent my speedometer last Friday and got it back today
Excellent service

[dean1057]

Noticed a problem on my 964 Speedometer since I fitted it back, odometer/Tripometer all working fine but when driving back in the dark last week I noticed I couldn’t see the speedometer, no backlight, I’ve bought new bulbs thinking it would be rare for 3 to go, fitted the new bulbs and no different.
Asked JDO and they say they don’t touch any of the electrics only the gear replacement in the clock.
Anybody any ideas???

[Nine One One]

Have you actually got power to the bulbs? Is the dimmer for the dash lights turned right down?

[dean1057]

Every other clock is lit up apart from the Speedometer.
As it's just one plug that plugs in the back of the speedo I'm not sure how I check to see there is power to the plug, I'm not great with auto electrics.

[hot66]

you plugged it in the right way up ?

[dean1057]

The plug only goes in one way, if you've looked at the plug, there's 4 or 5 pins on the top and one pin at the bottom, impossible to get it wrong plus the speedometer works.
I've only lost the back lights.

[dean1057]

Checked the voltage across pin 3 and pin 7 and I have voltage that goes up and down when I twist the dimness switch so that eliminates the cars wiring. Has to be the clock so sending it back to JDO to investigate.

[dean1057]

Problem was all three bulbs had failed and the LED ones I bought…….want throwing in the bin.
Bought the correct bulbs for JDO he fitted them, bench tested it, returned it and it’s back in the car.