400 diesel repair

Sounds like the heads are going to have to come off and see what's going on in there. Got a feeling the first gentleman is right that wrote to you, a crack in one of the heads. It doesn't sound like a cracked block or sleeve, because then you should be getting water in the oil pan or blowing water out of the radiator from the engine compression. We had a hard time getting ours to seal the gaskets, but the heads were good. When you go to put the heads back on, use some Permatex Seal-a-Gasket spray on the head gaskets and then torque the puppies. Run the engine about 30-45 minutes and then shut her off and retorque the heads. Yeah, I know you have to take the vale rockers off again, but it's worth it cause you'll get another 1/8 to 1/4 turn out the head stud nuts. Then reset the valve lash when the engine is cold. Hope this helps a little.

Pat

I know I've seen reworked radiators for sale in Surplus Tractor Parts catalog, don't know how much they'd want for it. Probably pretty steep, that's a big radiator. If you've got a good shop around your place, you might try them to see if they can rebuild it. Let me know how you make out.

Pat

If you have some good salvage yards close by, they would be a real good place to try first. I know Central Tractor and Surplus Tractor Parts both list rebuilt heads for the 400, but the price is $400-$500. If you get a used head, it would be worth the money to have a valve job done on it, and while you have the heads off, put new freeze plugs in them. I did a valve job on mine a couple years ago, and then got a anti-freeze leak from the old freeze plug. Not happy.

Pat