So, I finally took the plunge, and decided to tackle new (Monark) injector nozzles for my OM602 (1992 300D 2.5 Turbo). A few questions and observations:

1) Maybe it's placebo, but the Diesel Purge actually seems like it helps. Engine seemed to idle a little bit smoother afterwards, and pull a little bit harder. Of course, it's not going to make worn injector nozzles like new again, but I can see it being a worthwhile thing to do going forward, once or twice a year.

2) The spin-on fuel filter is a pain in the ass! I mean, it's held in by one bolt, but trying to maneuver the old one out and the new one in is super frustrating, and seems to a guaranteed fuel spill. Why didn't the engineers design enough clearance for this thing? There doesn't seem to be any elegant way to do the R&R.

3) WTF didn't I remove the crossover pipe FIRST? If I had known how easy it was, I surely would have. Instead, I waited until I got every single injector out, except for #3, at which point I gave in and admitted that the pipe MUST be removed. Sure would've made removing the hard lines a lot easier, not to mention the return lines and every single other injector. Oh well.

4) Speaking of the crossover pipe, can I reuse the gasket, or do I need a new one? Do I need any kind of gasket paste? Should I do anything else while I have the pipe off? It's filthy inside.

5) My injector bodies are heinous and covered in surface rust. Can't wait to see what the insides look like. Heat shields are caked with carbon - no biggie, they're being replaced. But what about the prechamber, where the injectors thread into? Plenty of carbon and rust down ther as well. I tried my best to clean it out, with a bunch of Q-tips soaked in brake cleaner, but there's just no way it's going to be spotless. Is that okay?

No just need to bench test these suckers, then disassemble and soak in Chem-Dip overnight. Then beer!