Just bought a 1985 300D. Does it have an OVP relay. The tach is not working and i have been looking for the ovp but cant find it. Also there is a jack that is not connected under the steering wheel. I also have a 240D and that same jack is connected to a device that reads manual transmission on it. On the 300D should that be connected somewhere. I will take a photo of it when i find the camara.

Also there is a leak between the brake fluid reservoir and the master cylinder. Can that be repaired? or do i need a new assembly?

The OVP is in the cabin, passenger side. Remove the lower dash panel and you will see it on the right side, just below the upper (main) dash.

__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

thank you Jeremy. you are always a big help.

I'd replace the Master cylinder with a used one from a junkyard, or a rebuilt one from a store, but it can be rebuilt. there is an o-ring between the MC and the booster.

I just replaced the seals. I took them off my 240D, which I will most likely part out.

See the picture in post #10 of this thread for a good view of OVP, taken during dash replacement.

Jeremy

__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970