Hi folks,
I'm posting this for my retired next door neighbor who doesn't speak English well (he's Canadian . He recently bought a 1977 MB300 5cyl that wasn't running. He was a mechanic for many years and knows diesels fairly well, but not Mercedes car engines. We figured out that the reason the car wasn't running well was a bad injector pump. Yesterday I saw and he had found a "new" used pump (not sure where it came from). However there are some subtle differences in what is attache to the pump. I suspect this new pump is from a newer turbo model and was concerned it might have a different fueling profile (and other differences). can someone look at the pictures and tell me if there are any major differences between these 2 pumps? the dirty one on the black plastic is the original.


Thanks

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As a Canadian I will try to talk American. Whatever that is other than English. The gentleman may have immigrated to Canada at some time. Canada had a mass amount of immigration in modern times. It became a real mixing pot in the larger cities up here. Personally over the years I never experienced any issues with conversing with Americans.

Except when asking for directions. Usually they do not know where they are. Have no ideal on where they are going. Or where they have been.

His car does not have a turbo. There are features on the newer pump that cater to providing more fuel as the turbo builds pressure in the induction system. Where the old pump had only atmospheric compensation. I see no reason to not use the one he got for at least testing that I can quickly think about. It may actually function well enough for use.

It is impractical to do the reverse though. A non turbo pump for a turbo pump substitution. As no additional fuel is provided on demand.

Personally I do not like used injection pumps unless still wet inside and removed from an engine fairly quickly before reuse. Not sitting around dry for months or years first.

For example if I wanted to remove one and store it for a longer time. . I would just submerge it in a can of heating oil and close the container. As for the questions about fueling profile and the volume of injection. For all practical purposes they are the same. I think I am right and not missing anything.

Since he is or was a mechanic. Just tell him to make certain that not only are the crankshaft marks where they should be when he installs the injection pump. The cam marks must also be aligned as well. I suspect he knows this.

The 1984 and 1985 turbo pumps have a window in the side to lock the pump for installation at the correct setting. The pumps from the 81,82, and perhaps most of the 83s do not. They have to be drip timed. This information is in the sites archives. For both types.

Others may post what I may have missed. The primary issue is the turbo pump has a device called an alda. It responds to the pressure in the intake system the turbo creates. With some good fortune a member may post something they have done of a similar nature.

Thank you. FWIW He's from northern Quebec and as I understand it his parents were Ukrainian and Polish. His English is impossible to understand. His wife "translates" for me.

I forgot that we have a large French speaking component situated in Quebec. They make an effort to remain speaking French. For example the signs on stores must be in French by Quebec law. Many are bilingual with English as their second language. In certain areas of Quebec much less so. It is just better to speak French than English there. Their culture is interesting.

There are certain expressions that it may pay to learn in French. Can you take your clothes off is not totally mandatory. Yet some of those French women are really hot.

Historically what the English did to the French up in Canada is interesting. Some landed up in Louisiana as a result.Called Cajun country I believe.

The French also solved crime in my region in the early days. They strapped you to a horizontal wheel. If your crime was minor they used a steel bar to break your arms and legs. Then your ribs. Then killed you.

If the crime was of a more serious nature they just eliminated the killing you portion. Eventually collecting the bones. Needless to say crime was not an issue. Only discontinued as it was eventually finding people to use the bar impossible.

When we visited a well restored French outpost of days gone by. Actually a restored small town. About two hundred miles away. I asked a guide where the wheel was in the community and the house of ill repute.

The nice lady guide explained. They where not to talk about the wheel. Also that the house of ill repute did exist as back then we were not giving it away.

The English forced the French out of this area of the maritimes without their possessions and land. They had done a maasive job of land clearing etc before what are known as the French Acadans where expelled. I live near an area of marshes and a fort they surrendered to the English without a fight. The amount of work they did to drain the marshes with the limited equipment back then is mind blowing.

England was the worlds superpower of the times. Was it abusive in the process. Of course.

There is a lot of interesting fairly local older and more modern history in the Canadian Maritimes. Thirty miles away for example. Is Prince Edward island. During the second world war the women outnumbered the men by a seven to one ratio. Unfortunatly even as old as I am I was not young enough to help out in those years.

That's a turbo pump. My former neighbor down the street installed a turbo pump on his n/a. It didn't perform the way he wanted it. I told him to try swapping the ALDA for the n/a's ADA. He said it improved but still not quite the performance as before. I never had a chance to look at it as he ended up moving out of our neighborhood.

It can run, but I think you might have to do some testing to dial it in.

__________________
1983 123.133 California
- GreaseCar Veg System

I had a feeling it was from a turbo engine. And I would be fairly confident that the fuel "map" would be different. I relay the info.


Thanks.

Actually the non turbo pump should be easier to aquire and cheaper as well. From cars sold in America from 1977 to 1980 inclusive. I would not use the pre 1977 earlier pump. It is more likely to have issues.


It is different but also should work. Cars sold new in Europe and eventually landed up in America. They have a differant injection pump usually. This covers up until at least 1977-1984 true European versions of their cars. As they also never had turbos. They should work well too. Anyone sitting on a good used non turbo pump should be glad to see it gone. The demand has to be small.