Diesel Engine Specific Aid

1984 300D Blower starting earlier

Hi all and happy holidays. My car runs great and is easy on the eyes too, but something has changed recently. When I left my climate control unit set on auto and the temperature wheel on heat (in the red) the blower would not switch on until the engine and coolant were warm, thus blowing warm air. Presently for some reason the blower fan comes on shortly (10 seconds) after start-up and consequently blows cold air until the engine and coolant warm. CCU? Water temperature sender? If so which one? Any takers on this one.
Mike G.

Chassis Model Number

W123

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Diesel Engine Specific Aid

'83 300SD Oil pressure - slow and low

I have an '83 300SD and when starting cold, it takes some time (5-10 seconds) to make oil pressure. I recently changed oil weight as winter is upon us. I'm using 5w40 now, and at a warm idle it makes just a little over 2 bars. I assume the gauge is measuring bars. When I was using 15w40 it made slightly under 3 bars when warm. The gauge is completely pegged when this engine has any throttle. According to the Mercedes manual this weight oil is appropriate for the temperature range in my area. It is ranging from about -5 at night to high 20's in the day.

Chassis Model Number

W126

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Diesel Engine Specific Aid

1984 300D No smoke!

Hi all and happy holidays. I have read all the posts concerning my make and model and have gained a tremendous amount of knowledge through this great resource. One thing that puzzles me is all the remarks about exhaust smoke. I don't know if I am just lucky but my 300D never spews any smoke upon start-up or running. The only time I can see anything remotely resembling smoke is when I really get on it at night and look at the headlights of the guy behind me. It is just about invisible during the day.

Chassis Model Number

W123

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Diesel Engine Specific Aid

1981 300D Non-Turbo Veggie: Not enough engine heat

I've been struggling with a problem of my engine not reaching optimal engine temp under normal driving conditions (summer driving in the mountains always does the trick). On my normal, mostly flat drive to work I barely maintain 165 degrees in winter temps of around 40-50 with heaters going (which just barely keep me warm). Here are my specs:

Chassis Model Number

W123

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Diesel Engine Specific Aid

80 300SD hard start with warm engine

I have been having intermittent hard starting with the engine warmed up. The problem only happens after the engine has warmed up to 80-90 C. The car has new glow plugs decent compression (300+ average)and starts right away when it's cold (below freezing).
The car always starts eventually but I have to crank for awhile 10-30 seconds. Same problem when running on diesel or veg and with oil just changed or ready to be changed. I don't think that I'm getting air in the lines and again it's intermittent so sometimes it starts right up when warm?

Chassis Model Number

W116

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Diesel Engine Specific Aid

1981 240D Idling rougher after valve adjustment

Before valve adjustment, car idled fine. Immediately after valve adjustment car idled fine. Probably after 1,000 miles of driving, car idles rough at a stop in drive or in reverse but idles fine in park. Another change is that it has gotten cold. This was a florida car and not used to the cold. I did install a block heater from you which helped with cold starts.Turning the idle adjustment knob on the dash to the left increases RPM and helps idling.

1.How do I adjust the idle so it will run right again without having to adjust the idle knob on the dash?
2. Is it ok to drive the car with the idle adjustment knob turned to the left a little bit?

Chassis Model Number

W123

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Diesel Engine Specific Aid

82 300D: Starter slow/nonexistant, replacement needed?

I have an '82 300D. When I try to start it, especially when it's cold, the starter works very slowly and feels like it is about to die. Seems like a dead or dying battery, but tested it and it's fine.

However when I hit the gas pedal when cranking, it does catch and start. This problem is especially harsh when the car is cold.

Do I need to replace the starter? Is there something else I'm missing? This car is my daily driver and I use it to cart my kids around and get to work, so I'm afraid to be stranded.

Thank you!

Chassis Model Number

W123

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Diesel Engine Specific Aid

1975 240 D Electrical Power For Radio

I do not have any power to the electrical supply to the radio. Just bought the replacement fuse set from Kent and have cleaned all terminals and replaced every fuse. On the fuse box lid there is not an indicated fuse for the radio. So,,maybe I am not looking in the right place. Where is the fuse for the radio supply?

Thanks,
Tom Smith

Chassis Model Number

W115

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Diesel Engine Specific Aid

1984 300D Injectors Replaced, still rough

I just purchased some rebuilt injectors (the Monarchs on this site) and replaced them over the weekend. I did a valve adjustment while i was at it. Put everything back together and she started up after some cranking, but it didn't fix the very rough running of the engine. I'm happy to have the new injectors in there as I was due for them, but now I have to run down the problem. Think it could be the injector pump? Seems like a cylinder may not be getting fuel, or perhaps very little fuel. How can I check to see if the injector pump is working properly (or any other ideas)?

Chassis Model Number

W123

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Diesel Engine Specific Aid

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