W123

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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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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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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transmission kickdown switch adjustment?

I have a 1983 300d. The accelerator pedal is not engaging my transmission kickdown switch on the floorboard. It makes contact with the switch but does not mash it down enough to engage the switch. Does anyone know the best way to adjust the throttle linkage to take out the free travel in my pedal and adjust it so that it completely engages the kickdown switch? Thanks for the help!

Glidehm

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79 240D oil pressure?

My 79 240D just got a new (used but better than it had) engine.
The engine starts good when cold (20 degrees now) and has good power for it's age.
I'm running Schaeffers 9000 series 10/30 synthetic. Had good luck with this oil in other diesels we own including old dodge cummins, and our new 09 volks 2.0 tdi.
And maybe what it's doing is no big deal, but it doesn't seem right.

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300D Vacuum Pictures & 5 way connector

Does anyone have any detailed pictures of the vacuum lines and connectors under the hood of a 1981-1985 300d? I a starting from scratch and the diagrams that I have found don't specify whay types of lines to use and they are vague at best on how to run the lines. Please help! Also I have seen a 5-way connector in some cars and the vacuum connector kit on this site does not include this? When was it used and on what models? I have the vacuum troubleshooting guide but it lacks the detail that I am looking for it this situation. Thanks for any and all the help!

GLIDEHM

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Failure mode for blower motor 300cd

My cars blower was erratic (sometimes it would operate on high, sometimes it would operate on only medium, sometimes it would barely blow) and I thought that either my switch was malfunctioning or the fan motor was going out. It seemed that it might be the motor since even the defrost manual high speed setting was unpredictable. As of yesterday it has stopped all together. Is this the normal failure mode for fan motor or switch?

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83 300CD no start after fuel filter change

Help!

I just completed a diesel purge on my 1983 CD, I changed both fuel filters. With the secondary fuel filter nut loose, I used the manual fuel pump to remove the air. I have a feeling the pump is not working.... After 15-20 pumps with the manual hand pimp, I tightened the secondary nut. At this stage the primary filter was 1/4 full. I ran the engine, it ran for about 30-40 seconds then died. The primary fuel pump is full. I repeated the air purge procedure again... no success. the engine will not start.

Can you please advise next steps... advanced thanks!

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