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1. My instrument cluster does not pull out far enough for me to detach the oil line and speedo cable. Why? The Haynes manual doesn't mention any difficulty in getting this clearance.
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I have had the instrument cluster out of our 300D a few times.
Although I have never had to do it, apparently the shop procedure says that the speedo cable should first be disconnected at the bottom end.
In my case, there is just enough slack that I can get my hand in and unscrew the speedo cable. Then the rest is easy.
Somwhere in the Diesel Forum, there is/was a very good set of pictures showing how to get at the cluster out in order to upgrade the lighting. Couldn't find it. Did find this:
"Removing the instrument cluster is a piece of cake.
There are no clips holding the cluster inplace, just good fit.
The removal tool is just two lengths of 0.045 inch wire with a small hook at the end.
These are inserted at the top, turned 90 degrees and pull.
I've always used my fingers appling pressure at the top and pulling.
The speedometer cable does not need to be disconnected from the transmission.
You will have to pull some slack to get the cluster out far enough to reach the speedometer cable at the speedometer.
There is an amphenol plug and the econometer hose to be unplugged.
Ease the cluster out and past the steering wheel and that's it.
As for the bulbs, there is a red capped bulb at the lower row of the cluster.
This ain't no bulb but a fuse.
I modified my holder by solderring a twin lead to the sides of the fuse holder and routing the wire back and behind the insulation under the floor mat and soldered a mini-fuse at the end.
Now if the fuse should fail I won't have to remove the instrument cluster to replace it, just lift the floor padding.
Happy Trails Beep Beep from The Spiderman in Houston!!!"
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2. My odometer is broken but my speedo works. Is the speedo cable at fault or is the speedometer itself at fault?
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Lots of stuff if you do a search - Guy in Montreal explains how to fix it. - Gears slipping, I think.
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The clear front panel of the cluster is also broken off. Finally, my fuel gauge reads erratically despite me having checked the fuel tank sending unit and finding it OK.
Would my best recourse be to just buy a used panel and gauges off ebay with all these troubles? Or if someone has extras, let me know. Thanks.
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Sounds like a used unit would be agood idea! Merceses salvage yards usuyaly have them - Why not post on this site under parts - lots of W123,s being dismantled.
Graham