The IP on the '73 would drip fuel from that vent pipe when the engine was running. Everything under it was wet with fuel, and I was getting a small puddle on the ground after parking and shutting it down.

I rebuilt the pump myself, using parts I got from the ABQ MB dealer, Pelican, and also from the local Bosch injection shop in Albuquerque. See this thread:

http://www.peachparts.com/shopforum/vintage-mercedes/368673-w115-220d-240d-lift-pump-valve-rebuild-kit.html

There's no information in the thread about this particular o-ring. I'll dig out some stuff tomorrow, take some pics, and report back.

__________________
- Greg -
1973 220D, The Prodigal Benz
1974 240D

OK - I pulled out my spare lift pump and shot some pics and took measurements from the extra push-rod o-ring I still have. I updated the thread I linked to above:

http://www.peachparts.com/shopforum/vintage-mercedes/368673-w115-220d-240d-lift-pump-valve-rebuild-kit.html

See post #7. I can't attach the same images to this post because I already used them to update that thread. I tried a couple workarounds to no avail.

I don't have the Bosch part number for this o-ring, but here are measurements I got from my spare:

- OD = 8.1mm
- ID = 4.3mm
- Cross-Section = 1.9mm

It may be the same o-ring as is used on the later, internally governed pumps. Hope this helps!

__________________
- Greg -
1973 220D, The Prodigal Benz
1974 240D

I'll give my usual helpful hint about here - Check out your local Parker Hannifin shop. They have all sorts of stuff including generic O-rings. It's probably a standard size (it's unlikely that Mercedes or Bosch made a special O-ring just for that application). Well worth a look.

Dan

Thank you! Thank you! Thank you, Greg. I'll be digging into this this weekend again and I'm sure you saved me some time here. I'll post how it turns out.
Greg

__________________
1972 220D
1981 300TD
1982 300D
2004 Hummer H2

No sweat!

__________________
- Greg -
1973 220D, The Prodigal Benz
1974 240D