Help: What oil goes into Injector Pump??
 

I am confused.

I have a 1977 240D German Market model and it has a red cap on the IP marked "Oel" which implies it should be filled with oil.

What oil should I put in there and is the pump not oiled from the crankcase??

I also have a US market 1977 240D and the German car is way way more responsive. The intake manifold casting is different and the IP is different. Anyone have a comment on this finding as to much better acceleration??

The IP parts that are touched by diesel is lubed from the fuel you use.
OTher parts are lubed by the engine oil.

not in the early diesel pumps back in the w115s and earlier models. They are oiled independently, not by the engine oil. Keep waiting for the correct response, sorry i could not tell you

Yeah, the first response in incorrect. You must add engine to the injection pump. I just picked up a 220D with a similar pump, you check the level by removing a small plug on the side of the pump to the right of the hand primer. If oil comes out you have enough, if not, add some, 15w-40 will work just fine. Also, that pump has a very neat vacuum govnor system that works off of the butterfly in the intake manifold and a plastic line runs down to the pump, works very well.

do you have the owners manual?

I want to say the same you put in the crankcase

I also agree on it being the same as whats in the engine.

maybe a light weight oil though..So wait, isnt the 77 240d a w123 thoough? So it shouldnt need its own oil as these are lubricated by the engine. Did early 240d w123's have different injection pumps than the later ones? But yea, if it has an oil filler, it definatly needs its own oil. Im pretty sure theres a few threads about that on this forum

615's had the style that required you to oil them

616's had the version we are used to

Actually he should look in the manual and I believe it will tell you to use 30wt or 40wt oil in the IP sump. (For winter I do not know.) Remember there is no oil cooler to cool the oil in the pump sump.
Of the fuel injection pumps I took apart in the past the ones that had their own oil sump had less wear on them I am assuming because the oil never got contaminated with engine gunk.
The problem is after the warranty period people would start doing their service at Jonny lube type places in stead of the Dealer or 2nd owners got the car with no owners manual and they did not know the oil in the IP needed to be checked. Another thing that was confusing is for a while some Mercedes models had the engine oil lubed pumps while others models did not . The result was that the oil eventually evaporated and caused pump damage.
Oil from the engine keeps the owner from forgetting to fill the IP but all the crap that gets into the engine oil gets into the IP lower end and causes more wear than the older ones with their own oil sump.

The old pneumatic governor looks neat but there is a butterfly valve in the intake manifold and the governor diaphragm over time gets stiff or develops holes or there is a little port that can get plugged up by corrosion.

Another down side to the IP's with their own sump is that the oil will over time be diluted with diesel from minute internal leaks. So just verifying the level is correct is not enough. I was advised to periodically siphon out all the old oil/fuel and then refill with the appropriate oil to the level plug mentioned above. Do believe it was engine oil, as others have mentioned. However it has been way too long now, probably close to 20 years.

It`s engine oil that these IP`s need...15w-40 is o.k.

IMHO the independent oil sump setup is better,because:
-you can change the oil whenever you see fit(piece of cake,a syringe and a small hose to suck the oil from top),you can flush easily the whole sump too...
-the oil`s always fresh and uncontaminated...
-you can easily observe the oil level and make conclusion whether it`s diluted too fast by diesel fuel(defective lift pump or worn elements)
-no fuel dilution of engine oil(tired elements or lift pump plunger)
-no engine oil is introduced to the cylinders and burned(same reason)...
Here are some links:
http://www.peachparts.com/shopforum/2892804-post10.html
A PES4M pump takes usually between 180 and 200mililitres(car on flat surface).
Inspect/change oil every(other) oil change. Maybe an overkill,but makes you feel better...
Good luck!

When Ford used a pump that had its own oil sump the owners manual wanted the oil changed every 50 hours! I doubt many did get serviced that often but that is what was recomended because of the small leakage from the delivery valves diluting the oil.
My $.02 Don

Wow. Just picked up on this thread and realised that I was way behind on my attention to this detail . I've got five of these that need a look-see.

Thanks, all you who contributed.

Sparky

Does the IP oil need to be checked on a 1983 240D?

No, look on the side of the IP you will see a small black plastic line that bolts onto the side of the Pump. This is the supply line of Engine Oil to lube the pump. The oil then flows back into the engine.


Charlie