distributor and cap problem - Mercedes-Benz Forum
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#1 (permalink) Old 07-26-2013, 07:51 AM
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distributor and cap problem

I replaced them on the 300TE a few weeks ago. Everything was fine until today the car started to lose power and backfire. I pulled over and noise was coming from that area when I pull on the throttle cable, as if something was loose in there.
I had the wagon towed home and I will work on it sometime this evening after I come back from work. Do I need to pay attention to anything special? Is there something that most people miss when they install rotor and caps? could I have something already bent or damaged that's causing the problem?
Anyway, I am off driving my wife's Honda back to work...
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#2 (permalink) Old 07-26-2013, 07:57 AM
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Sounds like the rotor or distributor cap mounting screws are loose. Or you may have overtightened them and they broke? Or a piece of the rotor holder broke off and is zinging around in there.

This is a troublefree area of the M103.

Now if you used Uro parts anything is possible.
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#3 (permalink) Old 07-26-2013, 09:20 AM
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Okay, I decided against going back to work so I went ahead and opened the cap.
This is what I found:

It broke at the shaft...
Is there any way to pull it off? Is this death sentence or do they make this part?
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#4 (permalink) Old 07-26-2013, 09:45 AM
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oh, the hex bolt was kind of loose too.
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#5 (permalink) Old 07-26-2013, 09:47 AM
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Wowzers...I'm not familiar with the M103, but I assume that flange just bolts to the camshaft, and can be swapped out. Be curious to find out if this is a known failure point on these.
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#6 (permalink) Old 07-26-2013, 09:55 AM
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IIRC Lowesguy ran across that on one of his cars a while back, I don't think his broke totally off but was cracked most of the way through. There is an updated version of that part that is made of aluminum
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#7 (permalink) Old 07-26-2013, 10:20 AM
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Weird, that little problem caused misfiring... LOL

You should unscrew that allen screw or torx screw that secures the rotor holder to the camshaft front bore. Then hope like crazy that you can get the broken piece of rotor holder out of there!

Then you hope like crazy that the camshaft bore isn't egged out or galled enough to prevent installing a new rotor holder. It's a very close clearance between the rotor holder and the camshaft bore.

And there's an alignment dowel driven into the side of the camshaft nose to position the rotor holder to the camshaft.

Then put everything back together and you should be fine. Don't overtighten the rotor holder or dizzy cap allen head screws!
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#8 (permalink) Old 07-26-2013, 10:51 AM
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I sprayed some liquid wrench but it's not sliding out. There is no way to grab anything.
I am thinking of using an easy out tool but I am afraid that I will break some sort of woodruff key that allows for the alignment of the distributor bracket. Yes, they call the broken part a distributor bracket at the dealer. I ordered one but I have got to get the broken one out
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Last edited by DP; 07-26-2013 at 10:53 AM.
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#9 (permalink) Old 07-26-2013, 10:58 AM
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Looks to me like somebody has been in there before judging by the Torx bolts on the cam gear. They look a bit damaged. Better replace them too.
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#10 (permalink) Old 07-26-2013, 11:06 AM
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This friggin wagon was owned by a Benz mechanic at the Mercedes dealership. No wonder I don't trust the dealers and more specifically their repairs.
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