Yup... because the 602 pic shows the closest water jacket is the other side of the head from the gp... and my pic shows how close a water jacket could be to a glow plug... especially one that's close to 6" long like the 606 plug is...

The part that was factually incorrect is: "injectors always spray fuel onto the GP ( when hot ) to fire the engine."

I agree the engine is toast.

To control drill depth you can buy different size drill stops with set screws. I don't like them and prefer a stiff tube over the drill bit as a stop. Ball point pen, nylon tubing etc cut to length works much better. I would not rely on tape as a depth marker on the drill bit because when the drill punches through the hole, you can not stop it.

I had an inspiration today in the shower for an innovative GP puller for the OM606. I think I'll design it when I get a few projects off the list. I just need a car with a OM606 in it now...anyone want to give me one?

:D:D:D

It is a quiet day at work so I am posting more than I usually do. I post necessary comment and is never redundant or off topic. I am getting out of here.

Good luck.

I still would try to repair the head rather than sell the car for $500 or so.

Check this out:
http://www.peachparts.com/shopforum/diesel-discussion/305254-innovative-new-twist-om606-glowplug-removal.html

This would probably easily pull (push, really) the broken plug in your head.

But he drilled straight through the glow plug, through the other side of the pre chamber. Your pic does not even have a pre chamber.

Not necessarily. That was my first guess.

The threaded plug might work well enough. If you can get the glow plug remains extracted first. May actually not be that difficult.

Mike,

Experience is the best teacher. You've learned a very hard lesson, don't let that go to waste. Keep wrenching! I started out twisting off rusted studs on air cooled VW engines, taking apart snowmobiles, killing various poor machines along the way, but keeping more alive than I killed.

There is a huge amount of information about any work that you care to attempt on any MB diesel from the 70's through the 90's. Take advantage of that, and I'll be you could even change out the head on your car.

Redeem yourself by replacing the head. You'll have a blast.

OM606 Head Cross Section View
 

...can be found in the MB "Model Year 1995 Model 124.131 Introduction into Service". A great resource for the OM606 NA and other changes to the 124 for
1995 model year. I think I got this book from MBNA for about $20 or $30?

Unfortunately I cannot post a scan of the appropriate page now, will do when I get home.

The picture shows what appears to be a cooling passage just below the glow plug, so if Mike angled down just a little too much, that passage could be breached.

MaxBumpo. That would be great to see. Thank you. If anything I think I angled slightly "down and to the left". By the way I never mentioned.... This is the GP to the front most of the car.

We'll get this thing fixed. I say try to salvage the head and then just watch the coolant level, unless you use the car for long trips. If it's just a commuter, then no worries if you have to admit the fix didn't work and start over with the decision to sell the car or replace the head.

Nothing to lose if the head would have to be replaced anyway!

Not if the plug is still stuck in the pre-chamber. That method works if the plug doesn't break off, but you can unscrew it all the way until the threads are out, but the carbon packing around the body makes it really hard to fully extract. If the glow plug tip is still sticking into the prechamber, when you try to pull out the pre-chamber you will probably damage both the prechamber and the head, as the glow plug tip gets sheared off.

I am sure the 606 is quite different than the 601-605. The 606 being a four valve per cyl head with the injectors in the middle of the combustion chamber, everything is laid out differently. With four valves, a prechamber, and a glow plug, there is very little space in there left for a water jacket. I can see how it would be easy to drill a little sideways and drill into a coolant passage.