Injection pump oil change?
 

So I've been spending alot of time on my old rig and I just noticed a place on the injection pump where you add oil?

Is this right? Never heard of it before, never added/changed oil in the 6 years I've had the car!

How do I drain it? And what kind/how much oil do I add?

mark, '76 240D

I believe it has a constant supply of oil from the engine oil circuit...

not the older models.

you have to drain and refill.

I have to drain and fill on my 73 220D. But this is not the case on later models. Someone with your model will have to tell you if it is a automatic or manual fill.

I think it has a little dipstick. You do have to drain it with the drain plug then fill it again. Not sure on the quantity.

just did this.

http://www.peachparts.com/shopforum/showthread.php?t=264538&highlight=injection+pump+oil

drain?
 

So, did you drain the sucka or did you suck it out with something? I don't have any real suction device, and draining seems tricky...

mark

I stuck a hose down it and sucked it out.

Someone mentioned using a turkey baster but I'm not sure it would go all the way down.

allen head size??
 

Just got some time to go do this and I realized I don't have an allen wrench big enough to fit this overflow plug. Can someone tell me the size so I can go buy it??

mark

C'mon, what size?
 

Hey someone who's done this surely knows the allen head size the drain/weep plug takes.....my biggest one is too small and I don't have the shop manual, I can't just to buying allen wrenches willy nilly!

Someone, anyone!

mark

allen size? Still?
 

Still waiting for someone who's done this to chime in w/ the correct allen head size for the drain/weep nut on the IP. I can't seem to find the answer anywhere!

mark

Mine has a 14mm hex bold head, not socket.

hex
 

Yes, mine isn't socket, I guess I say "allen" head, you say "hex".

thanks for the info!

mark

Lotsa fuel in there, little oil?
 

So I found the weep plug and proceeded to suck out what I could from the IP.

Well, this hasn't been done the entire time I've had the car, so thats 6 years.

What I found was just a touch of old old gummy black oil, and lotsa diesel fuel. Maybe 80-90% diesel.

I sucked out what I could, added more oil than was suggested (I read to add 1/2 cup, maybe a little more). But still after adding maybe 4 oz. of oil I still didn't see any seep out of the loosened weep plug. So...left it at that, started the car up , its exactly the same.

Is it common for there to be so much diesel fuel in the oil inside there? Seems kind strange!!

mark

weep plug
 

Also, I had a hard time figuring out where the "weep plug" was, am I correct in finding the 14mm plug on the side of the pump towards the engine? Mine actually has a little bent tube attatched to it .

mark