83' 300SD PS pump front seal leaking. have the seal in hand, anyone put one in with the pump still mounted? would save a bit of fiddly stuff.

Yes but, it'll be far more fiddly and difficult .

I hope you bought the BLUE seal .

You've got a 50/50 chance the large O-Ring in the back of the pump will still drip a little bit .

__________________
-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better

aw, crap. do you have a link for the BLUE seal! mine is the normal black. then it would match my BLUE hose clamp which came off of a VW Vanagon!



it's nearly always easier to remove a component to work on it than do it in place. guess i was hoping for that exception.

O.K., they don't sell it separately , it's in the FEBI brand kit : https://www.pelicanparts.com/More_Info/1264600061M36.htm?pn=126-460-00-61-M36&bt=Y&fs=0&SVSVSI=3411

@ $14.25 it's cheap, you may not need all the included seals and things .

I used a sheet metal screw to easily pull the old rock hard seal out and a deep socket to know the new one in .

DO NOT BANG THE PULLEY BACK ON ! .

There's always a load of old baked on oil and road mung visible once the pump is off, because a tiny speck of crud can and will ruin the job I always clean well before taking the pump off the car then a bit more once the other crud is exposed .

Be gentle, work slowly and carefully, you'll be well pleased with the result .

Thanx for the Vanagon tip ~ I'll have to go looking at junked ones now I guess .

Unless you have the application data ? . (the correct size would help a lot, it's stamped into the clamp) .

FWIW, I bought a used power steering pump from the junkyard (anyone selling used engines or breaking cars will have one cheaply) and took my time cleaning it up and replacing the seal .

There are a couple different pressure value pumps, IIRC (possible, stop laughing) the S Klasses (W116 & W126) use higher pressure but they all interchange and no real difference in driving, just cleaner .

If you're old pump ever makes a moaning or buzzing sound it's kaput and needs full disassembly and overhaul ~ don't wa$te time / $ putting a new seal into it alone .

TIA,

__________________
-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better

If the seal has been leaking for a long time inspect the LH engine mount. Power steering fluid quickly turns the rubber component into "goo".

__________________
“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now

Another reason to keep the engine clean......

__________________
-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better