Hi was wondering if anyone here could give me advice on 1955 d69u. We rebuilt the motor had head worked put it together and ran it a day ran great. It set for 8 months cranked it started running it and it started leaking water from the head not just spot here or there all the way around the head. I would understand if it did it first time ran it but it ran a day didnt get hot or use any water. Any advice on what it could be or where to start would be greatly appreciated. Thanks

I guess yours sure it’s coming out between head and block deck and not just running down from a leak higher up on the head and getting into the space there.

I expect you have a crushed ferrule in one of the water passages between head and block. Those heads are noted for seeping “oil” and coolant along the gasket, especially on the right side. General recommendation is to cost the head gasket with a brush-on gasket maker like Permatex 300 to stop it.

As for what to do now, simplest thing would be to use stop leak. That has some downside potential in that most old tractors have at least a partially plugged radiator and the pony motor water jacket is likely full of sediment already. Neither of which is going to be helped by stopleak. Still and all I have done it after cleaning the radiator flues and stopped a worse leak than that. I used a product called DIKE I buy at my local Covington heavy duty parts store.

You might want to try retorqueing the head as well. It’s not really too bad a job as you have had the rocker boxes off recently and know all about that. Big discussion of retorqeing heads on here recently you might want to look at.

I’ll try to bump my old post about my D6 and the radiator, leak, stopleak etc.

Hi,
as long as the ferrules etc are intact--as mentioned above-- on these old girls it is recommended to re-torque the cylinder head nuts after the first run and after the engine has cooled. Re-do again after 100 hours is what we did at the Dealer.
If it was mine I would try this first because as you say it ran fine until parked.

Mike Meyer queried this a few days ago at the end of this old thread :-

www.acmoc.org/bb/showthread.php?11244-Re...&p=236510#post236510


Hope this helps.
Cheers,
Eddie B.