Injection Pump Problems?? - Mercedes-Benz Forum

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post #1 of 22 (permalink) Old 06-01-2009, 06:24 AM Thread Starter
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Injection Pump Problems??

This is foreign to me, literally..

I have a 69 220D with an injection pump problem, I think. I know that this car isn't a powerhouse but I cant see a car being built that wouldn't go over 45.. Is there a proper way that I can test the injector pump? The car runs fantastic, and for a slow cruise around town, its the rod I want to be in. Hitting a hill however is a WHOLE other thing!! I cant get the speed right at all. I actually disconnected a part of the linkage in the rear of the pump, it seems to bog it down a little but I drove it with it disconnected didn't make any difference. Maybe I am wrong and this car will only go 45; I just cant see that being the case. The oil has been recently changed and it starts up the first time, every time. I know that its getting fuel, a friend told me that its maybe getting too much fuel, seems to be a little smoke coming from the rear that he says looks and smells like unburned fuel. Id like to drop the car off at a mechanic, but Ive gotten this far by myself and I think I should save my money.

Any suggestions???

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Last edited by robgigliotti; 06-01-2009 at 06:34 AM.
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post #2 of 22 (permalink) Old 06-01-2009, 06:49 AM
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Try to check the linkages. Is the fuel pump activated fully when youy floor the gas pedal?
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post #3 of 22 (permalink) Old 06-01-2009, 06:51 AM Thread Starter
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the lever on the back of the injection pump goes down when the car is floored. Still runs the same. Who do I know how far its supposed to go up or down?? I can go a bunch either way..

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post #4 of 22 (permalink) Old 06-01-2009, 08:19 AM
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Well, I do not know these models, but usually on older Diesels the maximum rpm is set by how far the lever can go. It is stopped by a system on the pump that can be tuned. Try to disconnect the lever and see if it can go further than what it goes when you floor the pedal. If yes, you may have part of the answer. Next step would be to check if all the ball joints in the connections are in place or even still there. They have a tendency to disintegrate on these older mercedes.
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post #5 of 22 (permalink) Old 06-01-2009, 08:25 AM Thread Starter
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I know everything is there, I saw a few pics and I have a book, but the book does not tell me how to make adjustments if there are any at all. Its all just linkages that you can make adjustments with the balls. Do you think this car is supposed to go more than 45? It is a heavy car, I think its only 67hp or so. Its like a lawn mower with a cab...

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post #6 of 22 (permalink) Old 06-01-2009, 02:36 PM Thread Starter
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Suppose there is a little oil on the intake side of the plastic air hose? Up close to the intake?? Could the diaphram be bad?? Can I just get a peice of rubber and make one? Can someone point me in the direction of getting a rebuild kit. I cant seem to find one anywhere..

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post #7 of 22 (permalink) Old 06-04-2009, 12:04 PM
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Check out EPSparts.com. That site has been especially helpful to me for finding parts for my '69 220D. They should have the vacuum pump/injector pump parts and anything else you need.
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post #8 of 22 (permalink) Old 06-04-2009, 10:15 PM
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Your injection pump probably needs to be timed. This is done with a special tube that replaces the first pipe on the IP. I have no experience in this area never having owned a diesel.

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post #9 of 22 (permalink) Old 06-06-2009, 09:13 AM
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Before you mess with the pump at all, you need to do a compression test and have your injectors tested. As far as timing the pump, that only needs to be done when it is removed. Do NOT mess with the pump, it is like a mechanical computer, and you are not a programmer yet.
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post #10 of 22 (permalink) Old 06-07-2009, 05:16 PM
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Is there oil in your pump? there's a plastic cap on it, i think it's red
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