MB 200 w115 engine question - Mercedes-Benz Forum

 
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post #1 of 5 (permalink) Old 05-15-2010, 02:15 PM Thread Starter
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MB 200 w115 engine question

Hi!

I have a question regarding my MB 200 -75 and it's engine.

I recently changed sparkplugs and saw something I haven't seen before and that was that sparkplugs from cylinder 1 & 4 were sooty and plugs from cyl. 2 & 3 looked normal. How is this possible, I mean, the carb distributes the same fuel mixture to all four cylinders...
It doesn't consume any excessive amounts of oil, no blue smoke when starting, it isn't weak, it accelerates fine.
Can also mention that the engine has run about 360 000km (222 000miles) and had the head serviced (new valve guides, seals, timing chain, gaskets etc) done at about 200 000km (124 000miles)
A recent compression test has not been made, but I will try to do it soon.

I don't know what the cause is and was hoping someone out there might know what gives...
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post #2 of 5 (permalink) Old 05-17-2010, 08:07 AM
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The first thing to do is to figure out exactly what car/engine combo you are talking about.

I'm guessing it is a 1975 W114 with a M115 engine equipped with a single side-draft Stromberg. Is this correct?
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post #3 of 5 (permalink) Old 05-17-2010, 01:16 PM Thread Starter
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It's an MB 200 W115 (1975) with an M115 2,0 liter engine and single side-draft Stromberg... all original stuff.
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post #4 of 5 (permalink) Old 05-28-2010, 04:46 PM Thread Starter
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Well, have done a compression test now and the readings from cyl 1-4 are as follows: 11,4, 11,7, 11,6, 11,7 bar

So, the only conclusion that I can make is that the valveguides and/or seals for cyl 1 and 4 (where the plugs were sooty) are worn...
Or that the plugs wheren't perfect, 'cause the ones I have now don't look as bad, they look normal all of them.
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post #5 of 5 (permalink) Old 05-31-2010, 06:12 AM
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Sorry for the late reply. I wasn't ignoring you, I've been busy.

The intake on your M115 has a vacuum port leading to the valve cover. Two ports actually but one leads to the brake booster. The center port is closest to the #2 & #3 intake runner. I'd suspect the choke is a bit sticky. The plugs were probably all fouled but the extra air allowed the two center plugs to burn the soot off quicker. Check the hose leading to the valve cover. If it's loose or leaking then it could be covering up a too-rich problem.
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