I would like to provide a quick update. I purchased a set of Beru glow plugs which I had to source from Lithuania of all places.

The part numbers were as follows:

0 100 221 107
GV 603

Out of five of these, only one of them was brass colored, the others were stainless color. They all had the same part numbers on them, and all were made in France

The glow plugs were all the same diameter until the last millimeter of the tip. Whereas the Bosch plugs which I removed in order to replace, narrowed-out in the last 5-6mm of the tip. The old Bosch ones I removed were 0 250 201 039

I believe they are all compatible

I purchased the Mercedes Source reamer kit, which included the generic reamer, which fit into a 12mm socket wrench. I only needed the socket wrench for a few of the glow plug holes, but I believe I could have gotten away without them. They did come in handy.

After reaming all five of the holes, not a lot of soot came out of each hole. I did use grease as the video suggested to 'grab' all of the soot, and I screwed the reamer all the way into each hole, except on two holes, were there was a gap of about 1-2mm between the flat part of the reamer's head and the outer wall of the cylinder head. I didn't want to force the reamer in any further.

Anyway, the glow plugs are all reamed and new Beru ones are installed

The only problem is, is that I wasn't able to start the car yet, because I did this job as part of a larger job, namely doing a valve adjustment, combined with a new valve cover gasket. I decided to do all these at the same time.

As I was removing the valve cover, the #2 fuel injector's mesh hose was too short, so I had to pull it off. Unfortunately I grabbed the hose right at the upper tip of the nozzle with a needle nose, and as I pulled it off, the tip came off with the mesh hose. So now I have to go to the junkyard and buy another 135 bar injector in order to see how well my work was. Which is sad, because the injector that I broke the upper section out of, was 'Remanufactured for MB' as the rubber sleeve on it says. However, unlike other Bosch injectors, this one didn't say where it was made. No Made in Germany, no Made in France (or worse, Made in India, which is what I fear they are trying to 'cover up' with the sleeve). I think I can get away with just taking an upper section off of another 135bar injector and swapping it onto mine. That way I keep the new looking nozzle at the base of it.

All the valves were very tight, with zero gap to put the feeler gauge in there. This is what was resulting in my lack of compression, and no power during certain ranges of RPM. I am hoping that my valve adjustment solved my problem. Anyway, that's my little story right there

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