W123, Electrical

middle dash int lights 83 300dt

I have a 84 300dt when I removed the face plate over the heater ac controls (to replace the bulb in the temp wheel) I found one extra bulb socket not in use total of five. one for temp wheel, two and three for vent control, #4 for fan control and one extra in the back not in use all have small 1.2 volt bulb.ps, light in shifter on and working. Any idea what extra socket is for? Question two all four switches across the top of center dash do not light up. (rear light switch, antenna ,sunroof, rear defrost) rear def lights up when activated.

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1977 300D coolant leak

Last year my parents bought me a 1977 240d with a 300d engine. I love the car because of its old style and drove it for about 4 months before pools of coolant started to appear under my car. I am wanting to fix my car now that my dad recently passed away and i need to know if anyone could help me by finding out what the cause is. I have had people tell me its a freeze plug behind the engine. All can tell is that its leaking between the engine and transmission. if anyone could answer this for me i would appreciate it and i would know that i must purchase a freeze plug.

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617 Diesel Injector Lapping Procedure

As I continue my quest for perfect 617 Diesel Injectors & truth I have just learned today that I need to have the internal surfaces of my injectors lapped to remove grime & build-up. . .

Is this something I can do myself (lapping the surfaces) if I take on the task of re-building my 617 injectors w/new Monark nozzles?

How would I do this?

thank you & Happy New Year,

Kieran-

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