I had the pics but didnt get the thread size, I will check in the morning.

The tool size is 1 3/8" diameter and 12 threads per inch.

LH or RH thread?
Was that tool used for the press in chambers?

Found some more info in my files....

Very handy to see a picture of that removeal tool. Finding stock that is left hand thread in that diameter is not easy. I guess I
(or anyone) could have a bar stock threaded at a machine shop.

In my case I rationalized the prechamber is bad anyway so I drilled out the threads ( that hold it into the cylinder head) . It remains stuck, but i have a 6 point socket, 1 “ drive on the way so i can use the big daddy cheater bar.

I will follow up when extraction is achieved !

Thanks again for the pictures and drawings:smile:

"Old wrote:

LH or RH thread?
Was that tool used for the press in chambers?

Right hand for the press in chambers.

This is the correct tool for his chambers, not the one Old Magnet/I showed.

New/used prechamber arrived. We decided before removing any more ( only one out at this time) we will install 1 - to replace the one cylinder that was not firing - and then pressure check the head assembly. If all check good we may proceed with installing the other 2 “good” chambers.

Why not change all 4 ? .... i could only find three and one of the existing chambers is the newer style , presumably replaced in the last 40 years or so....