Hello, I was wondering how to take off the W115 220D cluster. I've seen a lot of posts about how there is thumb screws but I can not find them. My car is a 220D 1969 since I know the cluster did change in the newer ones. Thank you.
I have a 1973 - still W115 but might be newer - sorry for the crummy photo it's all I had handy.
To remove this one (and it's similar for many many years) basically you just pull it out - that is both large circles and the clock are one large pice that is friction fit in place. There are no screws holding it; BUT there is some care to removing it.
Start to move it up down left right see if it will move at all - it's been stuck there for 45 years.
once it starts to move focus on the speedometer, try to get that side out enough to slip your fingers behind it
On mine (maybe not yours) there are two plastic fiber cables inserted behind the 70 and 90 MPH - these pull out and you have to do that before it will move much.
Then it will come out only a little bit more but enough to reach in and unscrew the speedometer cable, that is at the bottom center of the speedometer.
Now the speedometer side will come out enough for you to see behind the whole thing. ** Only that side will come out right now.
In the center of the the unit there is a multi pin connector - unplug that.
Now you have some room to work - there are two things connected and I suggest not messing with them, one is the oil line for the oil pressure the other is the the temperature. Depending on what you want to do you can probably do it here without disconnecting these.
need to repair the Speedometer? Take it out of the assembly (3 screws) comes right out.
want to fix the clock - it also comes right out
want to replace the lights? These are the little black holders push in 1/4 turn they come out - replace all of them, good idea (maybe LED's maybe not). Note the dimmer for these dash board lights is a big ceramic thing right behind that knob and they break - you can run a wire across the back of it and get the lights to come on (they won't dim of course but you can see the dashboard).
Not sure why else you'd want it out.
To put it back is straight forward - reverse the steps above, if you took the speedometer out be sure to get the trip milage reset knob seated correctly. And don't over tighten the speedometer cable in the back of the unit it made mine jump all around until I loosened it a bit. You might need some fresh friction tape or some kind of squishy rubber to keep it back in place.
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