glow plug removel problem 1995 E300D
 

I am replacing the glow plugs on my 95 E300D. Five came right out and one didn't. After much spraying of wd40 I got the plug to turn out to the end of the threads, but I can't get it out of the hole. Any thoughts? Am I going to find that it is "carboned glued" into the hole? This isn't the plug that was burned out. I'm in over my head--HELP. Thanks Jay

Hmmm,
 

I'm no expert. But I think I would hit it real well with the WD40, (I like Tri Flow myself) then turn it back in & out a few times. See if that loosens it up. Be careful not to break it off or strip it.

"Be careful not to break it off or strip it." That's my biggest fear. I have backed it in then out a few times. No luck. And I can't get a straight pull on it with a pliers because of the "stuff" on top of the IP is in the way. Just sprayed everything again. Time for bed. Thanks Jay

I Removed
 

The hard injector lines when I did my GPs. When you say "stuff on top of the IP" I think this is what you mean. Maybe you should remove the lines to get better clearence.

Good Luck!

The last time I had a stuck glow plug I squirted Marval Mystery oil in the area and let it sit, it came out eventually. Try to pull directly straight out and not and side to side movement to eliminate the possibility of preaking the tip off.

all the above suggestions are fine.

while trying to get it the last bit, twist too and that will help cut the carbon off the end...but be careful to keep it straight as you twist.

there is some chance of the plug being swelled too, but it has to come out and there is no other way that i know of.

tom w

You are now more than 50% there, since you cracked it loose.

Carefully work it back and forth, with a lot of patience, and a lot of PB Blaster or Kroil, a very small bit forward and immediately reverse.

The process will take up to two hours.......as I mentioned, patience is a virtue.

The alternative is disastrous........if you break one off. Several members have done it.........all have suffered badly.:mad:

Split a nut with the glow plug`s thread (12x1,25mm).Hold the two halves with grip pliers on the plug threaded part. Put a wrench socket or someting suitable between the cyl .head end the grip pliers for steady support.Let somebody carefully unscrew the damn plug....The plug will break @45Nm,be careful. Of course,any machine shop would fabricate the "hardware"needed. The method has been successfully tested on Beru glow plug on om605(250D euro)engine.Saddly,the pictorial is not active for the present.
Good luck!
P.S.something like this:
http://www.mytoolstore.com/otc/6005.html
Good luck!

Hmmm. a very interesting tool. I am not sure I get how it works.:confused:

on the pictute...the brackets slide on the halved nut that encircles the threaded part of the glow plug(or use grip pliers instread of the brackets).Hold firmly while your assistant turns the glow plug slooowly,sweating...and swearing...:D Et voila!

I can't figure it out either.

The threaded part of the glow plug is in the tapped holes......deep within the body of the head.........:confused:

If you have used it, kindly explain in more detail.

Boy, thanks for all the help. Here is where I am at. I have been able to back the plug out about a half inch past the threads. I just keep spraying wd40 and carb cleaner and turning it with a socket. I tried to pull it with a vice grips, but no luck. I bought some Blaster tonight and I'm going to let it soak overnight and try again Sunday. Thanks again, Jay

good work.

you may not have it out yet but it isnt broken!

tom w

Something else worth trying that doesn't cost much, and is not risky, is to go down to your local Radio Shack store and pick-up a spray can of that dry ice type spray. Then spray the stuck glow-plug to freeze it.

This will cause it to shrink, hopefully enough to make it come out, or at least to allow some of the carbon to let go and flake off.

Just a thought.

Phil

If the threads of the plug are out of the tap,half of the battle is won. Maybe the plug have some heavy carbon buildup,or has expanded someway.You use the halved nut (which has the same thread as the plug-12x1,25mm) as so to say,an extension of the plug hole thread. So,if you hold the nut or whatever your imagination yields around the plug threads...and someone turns the plug by a wrench..it comes out .
Here is the pictorial,but as I said,is missing the pics. Thanks to Veni from the Bulgarian MB forum:

http://www.mercedes-club-bg.com/forums/index.php?showtopic=562&st=15

Yes,it worked. Sorry,English is not my native language...
P.S. -EDIT-The pics are back...