D4 Precombustion Chambers

The 4F5678 retainer is replaced by 7M7842

I show the one piece chamber for this application as a 2S1273 but check it out. I have never bought any of these and there seems to be lots of confusion over numbers and applications. The one piece also uses a different injection valve retainer nut #5H7225

The 4F5678 retainer is replaced by 7M7842

I show the one piece chamber for this application as a 2S1273 but check it out. I have never bought any of these and there seems to be lots of confusion over numbers and applications. The one piece also uses a different injection valve retainer nut #5H7225

Attached is a link to my picture trail. The precoms I purchased from Dana at Florin. I cannot recall the part number. They were a one piece part. It has been a while, if I find the part number I will post. I posted more data after I did the work, I'll look for the post.

My tractor is a D42T series, fyi. Also, don't forget to drain the coolant from the block....

http://www.picturetrail.com/sfx/album/view/22616070

Draining the coolant will not be a problem. I think the only thing left assembled right now are the tracks, roller frames, and the final drives. The transmission and everything in front of it is scattered across the shop floor.

Thanks for the information though.
The shop said they had a 3000 ft*lb impact wrench on the precomp chambers to get them out. They fought all the way.

Good find.....but with my luck they would be for the later head.

He was a little nervous about compatibility but he said they look exactly the same just in much better condition. Any differences to look for?