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  #1  
Old 09-29-2012, 05:26 AM
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200D finally starts, but smokes alot

Hello forum,

I've got a 200D here that has sat for 12 years. Now it finally started to deliver fuel to the injectors, but when it finally starts, it quickly dies again, after a few revolutions.

I have video of it, and i would appreciate any help and ideas of what could be wrong.
Trying to start a Mercedes W115 200D after 12 years. Failed - YouTube

Thanks in advance, and greetings from germany,

Moe


Oh and I forgot to mention:
-Diesel pre and main filter are new,
-oil is new
-Clear diesel lines replaced, hence no visible air in the diesel system
-I freed the IP up with some rust easer, because it was stuck

What i haven't done yet:
-Adjusted the valves (they were all more or less in spec, so I will adjust them once I get/make the special wrenches). But i think if this would be the problem, it woudn't even start a little, right?
-Adjusted the injection timing. Does the same apply as with valve clearance above?


Last edited by Mojoan; 09-29-2012 at 11:35 AM.
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  #2  
Old 09-29-2012, 07:22 AM
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Are the glow plugs working? I would not have released the starter as soon as you did. I would have helped it run with the starter for a number of seconds to get it running well before disengaging the starter. It behaves exactly like a diesel trying to start at 25 degrees below zero which makes me suspect bad glowplugs. I'd also consider giving it a separate fuel supply in a gallon jug to rule out any fuel delivery problems from the tank.
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  #3  
Old 09-29-2012, 07:27 AM
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Fuel delivery is fine, I have propably pumped over a liter of diesel with the handpump, no problem.

Hmmmm glowplugs... Is it normal for the coils between them to become hot?

Edit: right now the battery is charging, so later i will try to engage the starter a little bit longer, to see if that helps. Would be awesome if that made it run
Also thanks for your quick answer

Last edited by Mojoan; 09-29-2012 at 07:41 AM.
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  #4  
Old 09-29-2012, 07:45 AM
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Yes, if the squiggly wires between the plugs get hot, they are energized. I suppose it is possible for the wires to get hot and the plugs not work if the insulators were not in the right places, but that's not likely.
Engine was turning a little slow with the starter in my opinion but I thought the battery might be low.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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  #5  
Old 09-29-2012, 07:54 AM
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Well then only time will tell. I will update this thread when I know more.
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  #6  
Old 09-29-2012, 09:41 AM
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IT'S ALIVE!!!!

Video to follow
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  #7  
Old 09-29-2012, 11:25 AM
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1975 Mercedes /8 First start in 12 years! - YouTube

and here is a second video of the smoke that comes out of the exhaust:
Mercedes 200D Start - YouTube

Next thing I'll do is adjust the valves, but first I have to bend some wrenches...
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Old 09-29-2012, 11:56 AM
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It could be an issue with the Pneumatic Governor Diaphragm or a leak in the system.
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Old 09-29-2012, 02:25 PM
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Thanks for the tip. I'll check that tomorrow.

Another thing i remembered: the idle seems to go up-down-up-down, by about 100 rpm every 2 or so seconds
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Old 09-29-2012, 02:30 PM
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Mojoan-
Glad you got it started. Perhaps everything is fine at this point, but I heard one noise in your videos which I wanted to mention. It is a high pitched whoosh of air, that sounds like a dummer tapping on a snare drum (or maybe high hat). I got that noise on my car when I overtightened a glow plug, which broke it. This caused a leak of air to occur after each ignition in that cylinder. My car was able to start with this condition, but would not run well. So I might be imagining the noise in your videos, but I wanted to mention it.

Oh, and by the way, I challenge you to a drag race!
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Old 09-29-2012, 02:35 PM
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Thanks!

I accept the challenge but only if the amount of smoke you produce gives points too because you have an unfair advantage with those 10 extra horses

Oh and i never touched the glowplugs, they are fine...

Just a thought: Could the diaphragm get dried out from 12 years of sitting?
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  #12  
Old 09-29-2012, 05:34 PM
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This car does not have the rapid heat glow plugs that are used today. You have to hold the knob on the dash in the first position until the indicator glows red inside- this indicates the GP's are up to temperature. This could take as long as a minute.
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  #13  
Old 09-29-2012, 05:55 PM
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Quote:
Originally Posted by rscurtis View Post
This car does not have the rapid heat glow plugs that are used today. You have to hold the knob on the dash in the first position until the indicator glows red inside- this indicates the GP's are up to temperature. This could take as long as a minute.
There's a neat Bosch "quick glow" system that's available for these older models that works just GREAT!

Fluctuating idle RPM can be caused by sloppy throttle shaft at the intake butterfly, or sloppy shaft in the rear housing of the injection pump. Both need to have very minimal to no up and down play- some axial play is OK.

Replacing those with good tight ones makes all the difference in these old Diesels.
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  #14  
Old 09-29-2012, 07:13 PM
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Black smoke is unburnt fuel. I'm betting your compression is low from sitting so long so you're getting incomplete combustion. I think after driving it a while the smoke might go away. Or, your air filter may be dirty.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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  #15  
Old 09-29-2012, 08:38 PM
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After 12 years, all the soot in the exhaust system will come loose and blow out. That could be what you're seeing. If it continues, it's something else.

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