Hello. Does anybody know what this is? It's on the injection pump of my replacement engine (1984 300D, I've been told...). My old engine does not have this component. There is a wiring loom coming off of the right side with three wires which have been cut (junkyard removal).

Thank you!

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r2

'85 300SD 193k miles (parts)
'81 300SD 400k miles-sold
'84 300SD 205k miles-sold
'84 300TDT 270k miles-sold
'80 300CD 200k miles-sold

I think it's a rack position sensor. Is your '84 engine a Cali motor? I thought only 85's had them, but often Cali 84's have what fed 85's do....
I'm not sure what they do, or if they do anything.....
My '85 wagon has one.
{only speaking of W123's. Don't know anything about W126's}

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John

My 85's got the same thing, and I have no idea what it is either.

Rack position sensor for the EGR computer. Same thing as a throttle position sensor on a g@sser so the computer can determine how much to open the EGR.

Rack position sensor! Thanks!!!

I'm in California and the junkyard is here in CA so it probably is a Calif car. It is marked as an '84.

So my next question is what to do with it?! Can I just ignore it?

__________________
r2

'85 300SD 193k miles (parts)
'81 300SD 400k miles-sold
'84 300SD 205k miles-sold
'84 300TDT 270k miles-sold
'80 300CD 200k miles-sold

Yes, it can be ignored in your case.

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"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

Thanks! I can do that...

__________________
r2

'85 300SD 193k miles (parts)
'81 300SD 400k miles-sold
'84 300SD 205k miles-sold
'84 300TDT 270k miles-sold
'80 300CD 200k miles-sold