LOL, 'we no longer don't support Windows 3.1'!
Yeah, I guess it's getting to be academic. I had no warning of the failure, and it was sudden and dramatic while on the highway. Whatever the cause, I think we can agree the prechamber and that ball and its support are pretty robust. I think someone posted that injectors should be rebuilt/swapped out every 100K...considering the ease and low cost of doing so, I think that's a good idea, along with the glow plugs. One or the other or both were most likely the cause here for the catastrophic failure. Oh, someone asked about the grain structure...that was of the sectioned prechamber. On another topic, today I worked on smoothing out my idle on the replacement 617 engine...took a shot at the rack damper bolt...wow...what a difference...it idles beautifully with no bounce...must have dialed it in about three turns...probably could use the new style with stiffer spring which I ordered...but for now, it surprised me how well it adjusted. No problem stopping or starting either.