Odometer Gear Replacement
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Intermediate
Joined: Jun 2004
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Odometer Gear Replacement
I have an 86.5 that I just replaced the odo gear on. I poked around on this forum, but I did not find any writeups on the job, so I am posting this one in case someone needs the help. Since I have never pulled the dash apart before, I got this little helper to read before i started. www.rennbay.com/odotutorial.html I also ordered the gear there as well.
The job is not near as hard as I thought is was going to be. The only problem that I had was that after I got it all back together, the odometer still did not work
So I pulled the whole thing apart again and found that one of the little detents on the odometer wheels was actaully bound up. I think this may have casue my problem with my gear breaking in the first place. I played with the wheels for a while until it started to move freely, then i put a drop of lube in there to help keep it free. I put the pod back together, but did not bolt it all back together until I tested it first. I'm glad I did that becasue then the tach was not working. I unplugged the connector and plugged it back in and all was good. Finally I bolted it all back up again and took it for a test drive. Everything seems to be working fine now. The whole deal took me about 4 hrs., but would have been much less if I did not have to atke it apart again. Now that I know what I am doing, I think I could do it again in about an hour!!! 
The job is not near as hard as I thought is was going to be. The only problem that I had was that after I got it all back together, the odometer still did not work
So I pulled the whole thing apart again and found that one of the little detents on the odometer wheels was actaully bound up. I think this may have casue my problem with my gear breaking in the first place. I played with the wheels for a while until it started to move freely, then i put a drop of lube in there to help keep it free. I put the pod back together, but did not bolt it all back together until I tested it first. I'm glad I did that becasue then the tach was not working. I unplugged the connector and plugged it back in and all was good. Finally I bolted it all back up again and took it for a test drive. Everything seems to be working fine now. The whole deal took me about 4 hrs., but would have been much less if I did not have to atke it apart again. Now that I know what I am doing, I think I could do it again in about an hour!!!
Team Owner
Joined: May 2004
Posts: 31,166
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From: Philly PA
usually the gear in question disintegrates, so they will all fail at some point,
If you ever pull the pod again if you didnt know this then I would remind you that you should always disconnect the battery while working on any electrical parts especially the pod the light switches and other ones have a nasty habit of sliding out and grounding out on the seating edges of the pod and since its made from aluminum the wire harness back to the CE panel will usually be smoked. Glad you got things working, Keep Em Flying!
If you ever pull the pod again if you didnt know this then I would remind you that you should always disconnect the battery while working on any electrical parts especially the pod the light switches and other ones have a nasty habit of sliding out and grounding out on the seating edges of the pod and since its made from aluminum the wire harness back to the CE panel will usually be smoked. Glad you got things working, Keep Em Flying!
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Joined: Jan 2003
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From: Double Oak, TX
I stock the Rennbay odo gears in MPH & KPH and also have the tutorial.
Very easy to do the gear change - the harder part is pulling the cluster from the pod.
Very easy to do the gear change - the harder part is pulling the cluster from the pod.
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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."
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
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Joined: Nov 2006
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Here is a link for the Odo Gear Replacement. The instructions says 944 but its the same process.
