Porsche 911 MILEAGE SPEEDO Gauge GEAR Repair 1976 - 1989 MPH Dial Clock Cog
If your speedometer works, but your odometer (mileage counter) is broken then you can almost guarantee it because your old primary gear has failed inside. These were lubricated with grease when the guages were built by VDO, and the grease eats through the gear over time, turning it into mush.
This new gear will fix that, even better it is manufactured from the best quality self lubricating plastic, so history dosent have to repeat itself (you dont use grease on re-assembly).
This new gear will fix that, even better it is manufactured from the best quality self lubricating plastic, so history dosent have to repeat itself (you dont use grease on re-assembly).
This gear is correct for all electronic 911 speedometers/odometers in MPH (miles per hour) fitted from 1976 to 1989 (2.7, 3.0 SC/Carrera, 3.2 Carrera, Turbo).
Changing the gear is quite easy, and the best bit is its not only significantly cheaper than a replacement speedometer/odometer, but you also get to keep the date stamp on the back (which is a quick check to see if a car is clocked when buying (the date on the back must be before the car was built)).
This gear does not work on KPH (Kilometer per hour), as the specification is slightly different.
Repair TIP
To remove the gauge, first disconnect your battery, then carefully pull the gauge towards you (wiggle side to side). Its only held in by a rubber ring. Take a picture of the wiring for reference and/or masking tape numbering. Use some needle nose/pliers and wiggle (side to side) the little light bulb holders to remove them.
Once you have the gauge out, take it to the bench, and then carefully (small screwdriver) pry up the lip on the back of the rim. Do half of it, and then you should be To pop the rim off, and disassemble the glass. Okay now the tip. First make a small mark for the resting position of the speedo needle. Then to remove, use your thumb and finger to gently pull it off, while twisting it anti-clockwise. Its sits on a tiny shaft, but the twisting motion, seems to release it. Thats the hardest bit.The rest is just straight forward assembly and disastrously. You dont need to pull the wires out the inside of the speedo, just the two screws to remove the face, then 4 screws, and 4 on the back, leave the internal wiring connected, and put some masking tape over the numbers once the face is off and it will hold them all in place.
At this point, you should see your broken gear,and you just swap the new one in. To install the speedo needle you gently push and twist it on, you can drive the car with the glass and rim, and using GPS, take the opportunity to calibrate your speedo needle (by taking it on and off). I have yet to break that tiny speedo needle shaft, but it can happen. Im told something like a WD-40 straw, and some super glue is an easy fix if it does happen.
To reassemble, the reverse of the above, and then twist your rim on, it will just glide on, followed by pushing it back down. Once fitted you wont notice any thing to the back of the rim as its out of site. You can if you want, spray the inner gauge rim pieces satin black, and then do all of your gauges. Use window cleaner on both sides of the glass, but nothing on the faces, they should be clean anyway, just some blue roll to wipe off any dust. Be careful to get your wiring in the right place, and you'll have a full set of new looking gauges!
Of course, you follow any advice above at your own risk, its merely advice, your own common sense takes priority.
