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I apologize as this has likely been asked a few times (I did do a few searches that came up empty), but how do you know which odometer gear you need when yours breaks? I have an '84 928s that has pulverized it's odometer gear so I can't count teeth... Is there a way to know which one I need instead of ordering them all from 928sRus and returning the ones that don't work? There appear to be 5 different ones available for our cars. I've attached an image of my current bad gear.
You'll probably get some answers here from folks other than myself, but I think that the fastest/easiest way to fix your problem and answer your question is at a website that I can't post here on RL. If you Google "The 928 Timing Belt - a Rite of Passage", you can find the other forum, started by a previous moderator from the 944 board. On that forum, you can find your way to a place in the Technical Section, where the odometer gears are discussed and questions just like this are answered.
I hope that's not too cryptic, but your post count means I can't PM you with details.
If the gear is crumbled and you can’t count the gears anymore, you need to count the partner gear.
So the total number of teeth of the partner gear added with your crumbled gear should always be 70.
So if your partner gear has 49 teeth, you need a new gear with 21 teeth.
Last month I also replaced my gear : it was 20x21 for my euro 928S of 1980
My friend had a euro 928S of 1984 and his gear was 20x32
If the gear is crumbled and you can’t count the gears anymore, you need to count the partner gear.
So the total number of teeth of the partner gear added with your crumbled gear should always be 70.
So if your partner gear has 49 teeth, you need a new gear with 21 teeth.
Last month I also replaced my gear : it was 20x21 for my euro 928S of 1980
My friend had a euro 928S of 1984 and his gear was 20x32
I learn something new about 928's every day - awesome info. Gerrit and thanks for sharing.
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission? George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Is their any other way besides counting teeth?
Like maybe a part number on the instrument cluster?
it would be a big inconvenience to take the odometer all apart ,
count teeth ,
then order a gear.
I wouldn’t count teeth or do any of those things. Instead, I’d just call Roger and give him the year of my car and let him supply the correct one. Easy peasy😃
Hi Karsten - that helps but does not cover the 5 x odometer gear variants used on a 928. It only covers two types - MPH & KPH in basic form.
Hi Roger,
we have here in Germany Mr. Matthias Heidergott, he has an repair shop for transaxle odometer with a test bench and for ~ 200 € you can overhaul the complete unit with new led bulbs and gears and cleaning and so on.
it would be a big inconvenience to take the odometer all apart ,
count teeth ,
then order a gear.
This was my thought exactly, but the cluster in my car has been replaced due to a speedometer failure, so I just had to bite the bullet and pull it out. The original gear was beyond being able to count teeth. The companion gear has 49 teeth, so I ordered the 21 tooth odo gear. Now I am waiting for the parts. At least it's not nice driving weather.
12-15-2023, 04:33 PM
How do you know what odometer gear you need?
George Layton March 2014
