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MrUkrainian 11-07-2013 08:49 PM

Alright, so I have a bunch of information on my other thread titled "300d 4 speed manual conversion" Basically, I did a valve adjustment during the conversion and now, my car starts up really rough, and it smokes white ALOT. It smells like it runs rich or something and it randomly misfires, no matter if the car is warm or not. I changed all of the glowplugs, but the one on #1 cyl was broken so I used one of my old ones. Now the glow plug light doesnt light up unless I turn the key 3 times. I did a compression test and all cylinders seem to have ok compression, all are above 300 except #5 is just under 300. I replaced the heat shield washers under the fuel injectors, hoping this would solve my problem. I also pulled the valve cover off again, thinking maybe I adjusted the valves wrong or something, but everything seems to be fine. I'm 16 and I dont know what to do anymore. Please help! Thanks. -David

Carpenterman 11-07-2013 09:25 PM

Is it possible you were working with S.A.E feeler gauges instead of metric when you adjusted the valves?

SD Blue 11-07-2013 09:29 PM

From your post, it sounds like the smoking started after the valve adjustment. Did you check clearance, for the valves, in the correct area?

The diagrams in this post illustrate this very well:

cooljjay 11-07-2013 09:31 PM

Bad glow plugs....white smoke is usually unburnt atomized fuel.....what do you mean the glow plug broke? What brand of plugs did you put in? Did you ream the carbon? No glow plug light also suggest bad plugs....may also be the relay....

MrUkrainian 11-07-2013 09:43 PM

Yes, I checked the clearance in the right area. And what I meant by broke, was when I put in that glow plug, the upper part unbolted and a bunch of white powder fell out. I wasnt sure what that was, so I installed an old one, but I thought maybe it was the one that was failing, so I changed it out with a could of more, but it still starts the same. I have a feeling that glowplugs are definatly a problem, but its not the problem of the white smoke and misfire randomly. The white smoke doesnt stop, no matter how long the car is running. I have a 300SD with the 617 and it starts up rough because of glowplugs, but one it warms up, it runs really smooth and doesnt misfire. Here is a video of the startup. 300d w123 rough start - YouTube

TnBob 11-07-2013 09:52 PM

Id sure recheck all your valve settings. Next would be vacuum connections especially the one down low close to your oil filter housing.

Great looking MB!!

Zacharias 11-07-2013 09:53 PM

Are you sure that you did not mix up the intake and exhaust valves (the adjustment spec) on some of the cylinders? (You said you went back and looked, but if you were using a cheat sheet that was wrong to start with....)

Front to back: 1)Ex In 2)In Ex 3)Ex In 4)In Ex 5)Ex In

Here is a diagram (courtesy toomanyMBZ):

Did you at any point turn the motor counterclockwise?

MrUkrainian 11-07-2013 09:58 PM

I'm pretty sure I did not confuse the two. I used dieselgiants diagram and the specs he has on his maintenance page. If it is necessary, I'll pull off the valve cover a 3rd time. I just need to fix this car already.

Zacharias 11-07-2013 10:11 PM


Originally Posted by MrUkrainian (Post 3235535)
I'm pretty sure I did not confuse the two. I used dieselgiants diagram and the specs he has on his maintenance page. If it is necessary, I'll pull off the valve cover a 3rd time. I just need to fix this car already.

As I recall he did the demo on his page on a non-turbo, which has different settings (though he does list the correct numbers for a turbodiesel). You used the right settings?

Please check your work again. The first time I did it I used his diagram, I got confused on two cylinders... but I wasn't sure of myself, first time doing it, so I went back and checked before I buttoned it up.

You didn't answer my last question: did you at any time turn the motor counter-clockwise, in other words to the left?

Your car sounds like it isn't inhaling and exhaling properly. There are only two ways that could happen, through mixing up the valve settings or the motor being out of time.

I am not an expert in this stuff but I HAVE put a motor out of time, a straight six gas engine, and it sounded not unlike yours.

cooljjay 11-07-2013 10:15 PM

Post some photos of your engine bay....if this just started after the valve adjustment and your positive you used the correct turbo specs and adjusted them correctly, put the gauge in between the lobe and pad....then its possible you knocked something lose.....I can tell one thing I don't like, is that crappy air filter setup....still beats me why so many people add them on, maybe impressed by Hondas or something?

MrUkrainian 11-07-2013 10:21 PM

I used the correct valve specs for the turbo diesel, I did notice that in the demo he was working on a non turbo. Also, I made sure to turn the engine over clockwise and not counterclockwise.

MrUkrainian 11-07-2013 10:27 PM

Could you explain what you mean, "knocked something lose"? You mean under the valve cover? I'm not sure what I could have done wrong. Also, I'm not 100% sure its from the valve adjustment. Over the summer, I started the manual conversion, and finished it at the end. The car sat for about 2 months. Could it have anything to do with the actual conversion, or is that not likely?

MrUkrainian 11-07-2013 10:55 PM

How do I check if the engine is timed properly?

TnBob 11-07-2013 11:16 PM

Changing tranny's doesnt make a car run like that.
You might ask a buddy to come over and ask him to check a couple valves
per the diagram.

greazzer 11-07-2013 11:25 PM

I would take a break from the car for a day or so. At least that is what I do if I become stumped. Seems to clear the head and the next day or so I do much better.


1. I would double check the valve adjustment. If the Valve Adjustment was the "event" in which the car ran Ok before the valve adjustment and after it was done it did not run so OK, then it's most likely the valve adjustment. Not sure what else one could have inadvertantly knocked lose, et cet.

2. Are you leaking fuel from anyplace ?

3. Going from auto to manual trans has nothing to do with the engine running that way.

4. If anything, whatever it is, it is fixable.

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