Washer pedal stuck

The pedal that operates the washer on my W114 is stuck. This makes the washer pump run constantly, so I temporarily unplugged the pedal to keep it from running empty. The pedal has to be pulled out to stop.

Is it possible to take the pedal apart, and perhaps change the spring or whatever may cause the problem? I can't see any screws or anything on it.

[Mark DiSilvestro]

The washer pump on my 250 is mechanical. If the pedal is stuck, it won't pump, but it does work a switch that will keep the wipers going. Has someone added an electric pump to your 250?

To answer your question, the original pump pedal and spring is pinned or riveted together. You would need to cut or grind it off and replace it with a screw and nut.

Happy Motoring, Mark

Yeah, someone must have rebuilt it, because there is no stopping this thing... When you say mechanical pump, does that mean you actually pump the fluid with your foot?

If this is the case, if I get a used pedal from another car, I might have to rebuild that as well to fit my electrical pump. Did the W123 model have a foot switch too, or did that end with the W114?

[Mark DiSilvestro]

Yes, the '72 250 originally had a rubber bulb pump under the pedal. The only electrical function at the pedal was to switch the wipers on while the pedal was depressed. I believe, by the mid-late '70s, Mercedes had switched to electric pumps on most if not all models. The rubber bulb pumps work fine until they get old. Then they either break open or the disintegrating rubber particles inside plug up the washer nozzles. The original Mercedes replacement pumps are expensive but other vintage cars (including some '60s Fords) used similar rubber bulb pumps.
I converted my 250's pump by wiring the pedal wiper-switch to an electric Chevrolet pump.
The pedal no longer works the wiper but I don't mind.

Happy Motoring, Mark