Author Topic: How to fix a stopped km odometer (Read 3607 times)

bad_robot · « **on:** January 02, 2012, 03:01:07 AM »

The small 12 tooth pinion gear on the odometer motor is plastic and after about 220,000km it will fracture causing the odometer to stop.

A HPI 72484 12 T Steel (micro) gear will fit. Remove the remaining broken plastic gear and the brass centre and fit the steel replacement. It has a small locking insert that will screw onto the shaft that goes from from the motor to the cog. Make sure the motor shaft can move up and down (ie still has some play in it after fitting the new pinion. Make sure all cogs can move. I put the locking screw to the base of the new cog. Make sure u remove all broken bits. Gently clean out old grease.

getting the instrument panel out
2 thumb screws (7ml dia metal) behind the dash will allow the facia to be removed.
This will allow 4 screws in the bottom of the next facia to be removed - there are 2 in the top. Look for 2 v shaped side supports holding the instrument panel at the top sides. Slide the panel out to the left (RH drive) - pull up the 2 black plastic fittings holding the 2 wiring harnesses to the panel - this will allow the wiring harness ends to be pulled off the panel. Remove the 9 screws holding the back and remove the 4 screws holding the speedo to the panel. Look at the inside of the speed and you will see 3 cogs - 2 large (about 20ml in dia, black and yellow, these will be ok) and 1 small cog (about 5 ml dia and this will be broken). No need to remove the steering wheel.
Your odometer will now continue beyond 220,000 km and that will last the remaining life of the car.

DesktopDave · « **Reply #1 on:** January 02, 2012, 09:22:45 AM »

Thanks for the tip & part numbers...very helpful.

I noted that the site filtered out an earlier thread with the same info; I deleted it since you've fixed the problem here.

locknload · « **Reply #2 on:** January 09, 2012, 05:56:31 PM »

Er, are we to understand that this part number is only valid for cars that measure distance in km's?

keflaman · « **Reply #3 on:** February 07, 2012, 02:35:35 PM »

^This part number is for a 12T (12 tooth) gear which all E23, E24, E28 and e30s use. Here's a good reference and source: http://www.odometergears.com/documentation/product_list.pdf

dhirsch · « **Reply #4 on:** February 07, 2012, 07:05:06 PM »

+1 for odometergears.com

I know the guys running the company and they're making great products and offer great support.

keflaman · « **Reply #5 on:** February 08, 2012, 08:40:43 PM »

I've bought two sets from them in the past. The quality is obvious.