Replace Odometer gears - The advantage of doing this repair as a preventative fix is you won’t have to fish around and find all the tiny gear fragments. This seems to be an age-related issue, eventually, every 964 & 993 owner will encounter it. Two of the plastic internal parts, a gear, and the larger pod it attaches to become brittle with age. An easy kitchen table project to do.
The gear sets are available at multiple online aftermarket Porsche suppliers or even eBay. Be aware there are slightly different gears & pods with different numbers of gear teeth depending on the market where your car was originally delivered.
For example, if your car is the USA-delivered 993 the gear set is for a 993 sold originally in the USA market. The other way to ensure you get the correct parts is to count the number of teeth on the original gear & pod and buy the replacement parts with the same number of teeth. Also, see “How to repair a broken odometer” on p-car.com or similar tutorials such as this available on several other 993 enthusiast sites.
The most challenging part is to release the bezel ring to remove the glass to gain access to the internals. It is not really difficult but requires one to go slow and use some care bending the rear-facing bezel edge to get it loose. Even if the rear-facing part of the bezel exhibits creasing from removing it, it doesn't show upon reassembly and does not influence the bezel's function going forward.
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