You have to pry up the lip of the bezel that is pressed over the rim of the instrument body.
With the speedo laying face down on a flat surface you take a small screwdriver and pry up small sections of the lip and work your way around the rim. Once you've done about three quarters of it you'll be able to pop the bezel off. The bezel holds the lens and sealing ring in place on the instrument face. Now you can spin off the 22mm nut on the back of the speedo and push the guts out through the face. There's a worm gear shaft on the side of the speedo drive that drives the odo. Theres a screw that secures it in place and if the screw is loosened the worm gear can be moved up so as not to engage the odo. gear. Maybe yours slipped a bit.
Upon reassembly you have to press the lip of the bezel that was bent up back down firmly to hold everything in place.
If you want to lube the shaft while you have it apart, first you must remove the drive from the back of the odometer cluster and dial face. Its secured with 2 screws. Then you must tap the worm drive that sticks out the side into the body of speedo drive. This pushes a steel ball out the other side and the worm shaft slides out through. With this shaft removed you can now pull or pry up on the magenetic wheel and pull the input shaft out for cleaning and lubing. There are a couple of spacers and lock rings in there so just pay attention as you take it apart. Its a nicely constructed piece of kit.
The process of removing the bezel is similar to the one described here:
Pelican Technical Article: Porsche Dashboard Gauge Repair and Refurbishment
Good luck.
With the speedo laying face down on a flat surface you take a small screwdriver and pry up small sections of the lip and work your way around the rim. Once you've done about three quarters of it you'll be able to pop the bezel off. The bezel holds the lens and sealing ring in place on the instrument face. Now you can spin off the 22mm nut on the back of the speedo and push the guts out through the face. There's a worm gear shaft on the side of the speedo drive that drives the odo. Theres a screw that secures it in place and if the screw is loosened the worm gear can be moved up so as not to engage the odo. gear. Maybe yours slipped a bit.
Upon reassembly you have to press the lip of the bezel that was bent up back down firmly to hold everything in place.
If you want to lube the shaft while you have it apart, first you must remove the drive from the back of the odometer cluster and dial face. Its secured with 2 screws. Then you must tap the worm drive that sticks out the side into the body of speedo drive. This pushes a steel ball out the other side and the worm shaft slides out through. With this shaft removed you can now pull or pry up on the magenetic wheel and pull the input shaft out for cleaning and lubing. There are a couple of spacers and lock rings in there so just pay attention as you take it apart. Its a nicely constructed piece of kit.
The process of removing the bezel is similar to the one described here:
Pelican Technical Article: Porsche Dashboard Gauge Repair and Refurbishment
Good luck.
