Changed some 606 glow plugs - PeachParts Mercedes-Benz Forum

connerm · #1 05-10-2008, 05:08 PM

95 e300d, 205,000. #6 was an open circuit. I soaked all of them with white vinegar for three days. I plugged the block heater in and got the engine nice and warm. #6 came out easily. #3 and #4 were also pretty easy. #2 was tight. I took my time and it came out. I used my impact wrench set on low torque and just banged away. Every now and then I tried to hand wrench it out. #2 was stuck on the barrel between the threads and the element. A large surface area of carbon made moving it very tough. #1 and #5 are extremely tight and I didn't try forcing them. They moved, but any more torque and it was going to bust. So I changed 4 of 6. Add that job to changing the engine mounts earlier this week and I've had enough for a while. At least the glow system works normally now.

Regards and thanks to all who went before and posted helpful info.

connerm · #2 05-10-2008, 09:29 PM

After a modest number of self-congratulatory beers, I took apart a behru 606 glow plug I removed today. With vice grips, I twisted the inner core out which left a nice 1 and 15/16 inch long hole in the body of the glow plug. A clever fellow with sticky glow plugs could tap such a hole and remove the element as described previously without the danger of wandering a drill bit into the head.

I thought this was interesting. Almost makes me want to bust off the threads of the two glow plugs still stuck in the head of my 606 and yank them out as described aptly in previous threads, but I'm not so clever.

dieseldiehard · #3 05-10-2008, 09:54 PM

Leave it alone if its got proper resistance.
better to be risk adverse than have to tap out a broken off GP. I've seen a head at a machine shop where the threads got messed up at a shop where someone tried unsuccessfully to get out a broken off plug on a 606 head. They are bad in that respect.

connerm · #4 05-10-2008, 10:00 PM

I'm with you. I'm just saing that if you did bust one off and still could grip the core, you could bust it out and have a straight shot with your tap. I've got six glow plugs glowing and I'm not going looking for any trouble.

Diesel911 · #5 05-10-2008, 10:05 PM

From the threads I have read they do not aways break where you want them to. Here is a site another member posted on how to drill the Glow Plugs out; should one break.
http://alan.mcreynolds.googlepages.com/howtoremovebrokenglowplugs-mercedesom606