Hello folks, I've started reassembly my 3J4086 cylinder head and have four of the precombustion chambers with the hex inside. One of them has a mangled thread with about 50% usable. I would think that's insufficient for the torquing specification. I also have three chambers with the threaded inside. I see Carlscat made a removal tool for the threaded chamber - would that also be suitable for installation?

Could someone also please tell me what part # goes with the interior shape. From my Form 6700 which is 3J1 through 5000, it lists:

2A5745 - up through 3J2386
5B9658 - 3J2387 through 5000

and then both of those are superseded by

8B4440

Which of those are threaded interiors, which are hex? The links in this thread are dead so I can't look up the history and these part #s only show up in advanced search under Roby's thread and Carl's thread

Cheers,
Neil.

Thanks Carl! Would you know which part # is the hex interior?

PM'd - thanks Carl! I had my guy make the injector tool, and I bought the spline and hex tool set, but I don't have the threaded unit. But I don't know which part # is hex vs. threaded for the D3400 so I need to figure that out before I order