BENZ AID - COMMON QUESTIONS AND ANSWERS

removing undercoating/rust 1979 300D

I was wondering what the best way to remove stock undercoating is for the at home mechanic?

Also, I seem to have a pretty large rust problem. I have Miracle Paint and would like to attack it from top and bottom but it seems like one of the screws holding down my passenger seat is rusted to the body. How do I get it out? Of course it's the right rear screw, the hardest to reach to begin with.

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Help solve this mystery: how did my transmission problems go away?

The transmission in my 1987 300TDT diesel wagon (W124) has always shifted a bit harshly, especially going from second to third gear, and from park to drive. After I installed new Monark injector nozzles, Beru glow plugs and cleaned out the oily gunk from the intake manifold, the transmission now shifts smoothly. It's like I installed a new transmission, but I didn't.

So which of these procedures (inadvertently) solved my clunky transmission? I'm sure it wasn't new glow plugs!

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Yikes...put in DOT 3 brake fluid! Suggestions ??

Yikes! I didn't realize the W123 uses DOT-4 and I've been using DOT-3. I have only topped off on DOT-3 (about two ounces, maybe 3 between two cars that were a little low), not bled and filled...so...the question...can I just bleed out and refill w/DOT-4? Or would it better to vac out the resovoir, put DOT-4 in and then bleed/refill. The brakes on one have been getting worse after sitting overnight...the first stop is an adventure if I forget to pump once before stopping (goes to nearly to floor).

Thanks a bunch.

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'84 300D - fix, or sell for donor/parts?

I got $3K out of the insurance company and got to keep the car....though the title is now branded SALVAGE

After getting the settlement, we decided to get a minivan (gasp) for the wife. it is an older Honda Odyssey, and we got it for a great price. I now drive our '89 Volvo 245 and the Mercedes has been sitting in the driveway. Now, I need the money, she wants the car gone, yada yada yada. long story short, I have posted it to the local Craigslist to see what kind of offers I can get for the whole car (no time, space, or tools to part it out). Initially, I was going to find another W123 and use this one for a donor. Needless to say, that option has not worked out thus far.

my grand scheme:
-sell the mercedes

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1990 300D Air blowing out of rim of injection port???

I noticed, recently, that there was what sounded like an exhaust leak in the engine compartment of my 1990 300D 2.5 turbo. In checking further, I found that the noise was on the intake side of the engine not the exhaust side. Checking further, I found that puffs of air(?) were coming out of a small half-moon shaped hole on the rim of the injection port of the last fuel injector (closest to the firewall). I bought your injector rebuild/test kit (monarch nozzles) and rebuilt all of the injectors and reinstalled them.

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What is unit on '79 300D top of inj. pump

Ok, I noticed a circular unit on top the fuel pump on my $175 '79 300D that had a vac. line that was disconnected. So, I hooked it up last night, but do not know its function; it is labeled as part #70 (here: http://home.comcast.net/~phantoms/vacuum/fuel_mixture_control.jpg) in the mixture control diagram. However, the diagram I have leaves out the description of what it is! I hooked it up and my son now says the car has less power than before. Note that mine does not have part #75, the nylon/plastic part vac. control valve shown in the mentioned diagram.

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51 220 Engine Won't Start

220 1951 MB Sedan
6 cyl
- we have compression of about 40
- Have spark
- PROBLEM ... compression coming through carb

The car sat for 1 year without being started. The only other time it was driven was just prior to that for 25 miles and there was no smoke either from exhaust or engine. The only smoke came from trying to start it and the started burned out. We replaced that and it never started again. It does turn over and has new spark plugs.

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