W201, BENZ AID - COMMON QUESTIONS AND ANSWERS

Engine won't shut off instantly/'82 300SD

It looks like I might have a vacuum leak. After turning off the engine via the steering column the engine still runs for about 2 seconds. If I press on the diesel pedal the engine will actually speed up a little then shut off. I would would like to know: Is the system under positive pressure or negative pressure? How do you test the fuel pump stop diaphragm to see if it holds pressure? Also the door locks still work but the brake booster isn't as effective recently as I have been having these problems.

Chassis Model Number

W126

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Diesel Engine Specific Aid

91 350SDL -- oil in the intake manifold

I found that there is a lot of engine oil droplets coming into the intake manifold...and think it must be bad oil seals in the turbo.

I am working through 350SDL issues and found the solid hose broken that goes between the air intake (pressure side) and the mechanical accuator that opens the waste-gate. I am assuming that this has caused the previous drivers to drive it over-pressured. Would that impact the turbo oil seals so that they could now be leaking into the intake air? Are there other things I should check knowing this has happened?

Chassis Model Number

W126

Forums

Diesel Engine Specific Aid

81 300d 123 Will not start

I have an 81 300d that I was running on BIO. It was loosing power and stall under a load. SO I removed the injectors cleaned replaced nozzles with monarks, bench tested and re-installed. Car ran then stalled and will not start. I drained the tank and filled it up with diesel. I replaced the fuel lines, filters and lift pump. Also replaced the glow plugs with monarks. Then did a valve adjustment. Changed the o rings on the injector pump, checked ALL banjo fittings and lines, replaced copper washers.

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

83 300-D Underdash Vacuum Line Connection??

I have an 83 300d. I removed the panel below the steering wheel and found a vacuum line simply resting against the back of my brake pedal. I raced the line and it runs through the firewall into the engine compartment. It is connected to the "T" that is on the bottom of the transmission modulator on the rear of the fuel pump. The other side of the "T" runs to the lower right side of the 5 way connector located on the valve cover. That is if it is viewed from the front. Does anyone know where this vacuum line is supposed to go.

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

1982 300SD engine mounts question

I see the engine mounts from under the hood. I also noticed what looks like a mini-shock absorber. Is that part of the engine mount? Is it important? How can you tell if it is working? The engine vibrates while in idle but it has no effect on that mini-strut. The rubber mounts are soaked in engine oil but they are not torn. I'm not sure how old they are since I just got the car 1 month or two ago. Mercedes Source has a neat engine mount kit that I can buy but I was wondering if aside form the two rubber engine mounts and the transmission mount, if the mini-strut should be replaced?

Chassis Model Number

W126

Forums

Diesel Engine Specific Aid

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