81 300TD Vacuum pump, which one? - Mercedes-Benz Forum

 
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post #1 of 9 (permalink) Old 08-19-2008, 11:02 AM Thread Starter
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81 300TD Vacuum pump, which one?

The last 6 numbers of my VIN is 003152. I need to have the vacuum pump rebuilt as my doors won't lock, the climate control is stuck at HEAT and the car runs on when shut off when it's hot.

Which rebuild kit should I use? Suggestions please.

I think that I have attached a photo of the pump on my engine.


BTW, where is the engine number?

Thanks,

Brian
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post #2 of 9 (permalink) Old 08-19-2008, 11:12 AM
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My advice is to replace the pump for $179: Mercedes 617 Engine Parts. There are two rebuild kits (valves and rocker arm), you'll need to determine the problem if you want to go that route.

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post #3 of 9 (permalink) Old 08-19-2008, 01:34 PM
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Before you replace the pump, make sure it is bad. Very common on those cars are disconnected vacuum lines, especially in the oil filter area. Pumps last long time.
Than from what I recall those are digraph (?) pumps. Digraph alone shouldn't be too expensive? If you can buy it sepratelly that is.
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post #4 of 9 (permalink) Old 08-19-2008, 04:34 PM Thread Starter
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Hi German Star,

If I replace the pump, is it a simple job of removing the vacuum hose from the pump and remove the old pump and replacing it with the new?

Kajtek1: Checked all of the lines first, very little vacuum before the power brake accumulator.

Thanks,

Brian
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post #5 of 9 (permalink) Old 08-19-2008, 04:40 PM
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Before you replace the pump, make sure it is bad. Very common on those cars are disconnected vacuum lines, especially in the oil filter area. Pumps last long time.
Than from what I recall those are digraph (?) pumps. Digraph alone shouldn't be too expensive? If you can buy it sepratelly that is.
No, it's the new style pump. If it were the old diaphragm style pump, I would have recommended the repair kit.

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post #6 of 9 (permalink) Old 08-19-2008, 04:40 PM
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Hi German Star,

If I replace the pump, is it a simple job of removing the vacuum hose from the pump and remove the old pump and replacing it with the new?

Kajtek1: Checked all of the lines first, very little vacuum before the power brake accumulator.

Thanks,

Brian
Yes, it isn't difficult, the pump is right up front and accessible.

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post #7 of 9 (permalink) Old 08-19-2008, 08:37 PM
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Hi German Star,

If I replace the pump, is it a simple job of removing the vacuum hose from the pump and remove the old pump and replacing it with the new?

Kajtek1: Checked all of the lines first, very little vacuum before the power brake accumulator.

Thanks,

Brian
Bad pump would affect your brake booster. Do you have problems stopping the car?
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post #8 of 9 (permalink) Old 08-20-2008, 08:34 AM Thread Starter
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Nope, stops quickly and the pedal is firm.

Brian
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post #9 of 9 (permalink) Old 01-14-2009, 03:32 AM
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Sometimes the two small tubes that feed vacuum to the lines become clogged. When running, disconnect the tubes and put your fingers over them (or a vacuum gauge.) If you do not feel suction, you may have a clog too (since the brakes work OK.)

On one car, I even had to drill out the hole to free a jam. Problem free ever since!
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