D13000 precup cooper ring

mojo66,

I am trying to find answers to your question. Stand by.

JanM

Intake and exhaust valves are not the same part number and are not the same. Are you dealing with pressed in or threaded pre-combustion chambers. Don't think it would make any difference if you copper coated the seat washers or not. Definitely would want to put anti seize on the threaded versions.

Pressed in pre cups and drop in injectors with hold down bracket

Looking down in the port where the pre cups bottoms out in the head it's a tad pitted where the copper seals goes is why I was asking about use of copper coat, any ideas how to smooth it out?

One of our members of Chapter 16, Scotty Graham, is currently putting in new liner seals for our D13000 sawmill engine project so I asked him about the valves being discussed here. He says "The two part numbers reflect different seat angles even though they are the same diameter." Ours is a 1940 production but "later engines had the same seat angle but the exhaust contact is wider to transfer heat. The intakes have a small groove around the top of the stem to identify them from exhaust."

He also noted that they did not have Copper Coat in 1940 😊 but putting some in there would not hurt.

Good luck with your repair.

JanM

If the chamber seats are not in good shape they need to be spot faced. I would think those push in chambers need all the help they can get. Metallurgy of valve is normally different between intake and exhaust.

on my 3t i used valve grinding compound between head and injector , rotated back and forth to lap them and clean them up

One of our members of Chapter 16, Scotty Graham, is currently putting in new liner seals for our D13000 sawmill engine project so I asked him about the valves being discussed here. He says "The two part numbers reflect different seat angles even though they are the same diameter." Ours is a 1940 production but "later engines had the same seat angle but the exhaust contact is wider to transfer heat. The intakes have a small groove around the top of the stem to identify them from exhaust."

He also noted that they did not have Copper Coat in 1940 😊 but putting some in there would not hurt.

Good luck with your repair.

JanM

If the chamber seats are not in good shape they need to be spot faced. I would think those push in chambers need all the help they can get. Metallurgy of valve is normally different between intake and exhaust.