Oil in the injector pump? - PeachParts Mercedes-Benz Forum

Antony · #1 01-07-2003, 07:49 AM

I've searched, but found nothing. I'm wondering if the fuel injector pump has an oil resevoir built into it? My '72 220 d is a Euro so the manual is in German and I've yet to recieve my W115 repair manual. Here is the jist of the puzzle: on the injector pump, next to the manual priming pump, is a cap with OEL printed on it, does this mean that within the injector pump there is some type of oil resevoir? If so what type of oil should be used within? Any help will be appreciated.

#2 01-07-2003, 08:06 AM

I'm not sure about the earlier engines, but the ones I'm familiar with have a line that feeds oil pressure to the pump. It is connected to the front of the block in front of the pump.

Good luck,

#3 01-07-2003, 08:30 AM

Yes the older injection pumps need to have the oil checked..

The top filler cap should say oil so should be easy to find.. that is were you add oil.. However on the side about half way down between the control rod and the fuel pump is a level screw or check plug..

Unscrew the check plug.. If oil level is too high, drain oil to check plug bore..

If no oil flows from the check bore, unscrew filler and top up with engine oil until it flows from check bore..

Note.. If a diesel fuel-oil mixture comes out of the check bore, Keep adding engine oil until diesel fuel-oil mixture has run out..

Hope this helps..

Ken

Fisherman · #4 01-07-2003, 10:31 AM

You have the pneumatic type governor.
Add oil slowly................
You can quickly overfill this and the subsequent mess runs down onto the frame crossmember and then your driveway and then anything else you come in contact with....
These pumps usually will have a good amount of diesel or at least diesel thinned oil in them so the first thing you will get when adding oil will be diesel out the plug. This is, I understand, normal.

I had a really hard time finding the drain plug.
If you need help let me know and I can take a pic.
Also on the side of the IP next to the engine block, you will see a small bent overflow tube. It is attached via a banjo bolt and curves up and then over, kind of like a bent finger. One way (probably not recommended) is to fill until the oil comes out the overflow and then drive it. It will throw out the excess but I caution that this wil be a drip for some time...

Antony · #5 01-07-2003, 04:26 PM

I've said it many times before....You people are THE BOMB! While pretty well mechanically inclined myself, the information that I receive ALWAYS amazes me. So, once again, thank you and I'll post when I get this sorted.

#6 08-19-2003, 04:24 PM

I found the fill pipe, after overfilling

is that the bleed screw over on the right? 240D '76 btw. Is the spill pipe just open all the time?

#7 08-19-2003, 08:43 PM

Yes and Yes.. Got them both right.. Pull bleed plug and fill with engine oil.. If the mix that comes out has lots of diesel.. fill until its just oil..

Ken