JD G water in cylinders

More G's · Jul 30, 2014

Last fall I rebuilt a JD G for a good stock puller. 125 over, took the head down a bit and smoothed the head and manifold out good on the inside, nothing drastic. I have done this many times. When I got the tractor running I almost instantly started getting antifreeze in the cylinders fairly bad. The head and block were both checked before any work was done to either. Its bad enough that it ruins plugs when you try to start the tractor, the plugs wont fire anymore. I drained it for the winter and havent had time until recently to look at it more. I used the black sealer on the head and manifold bolts to seal them when I put it together as I have done before. Thought maybe a bad head gasket so I changed that and it didn't help a bit. If I were getting leakage into the cylinders shouldn't that make pressure in the radiator when it is running from the compression in the cylinders? The radiator stays calm and still when its running. I'm wondering id I got a hole when it was bored from a thin or cavitated spot in the block. Just looking for ideas before I tear it down again. Thanks

Larry Baker · Jul 30, 2014

Did you use studs or bolts on the manifold.I have had several customers with the bolts that have been too long and forced tightened them and cracked the head

southpull · Jul 31, 2014

I had this happen once too. Some block sealer got it sealed up enough to get by until I had time to tear it down. Ended up being a crack in the head.

Anonymous-0 · Aug 1, 2014

Block is bad to have a hairline crack it will fill cylinder full of water I know this first hand!!

GoJDpuller · Aug 2, 2014

I agree with a hairline crack in sleeve me G did the same thing as well

JDGnut · Aug 4, 2014

pull the plugs, and pressurize the cooling system and start looking.. If you can get a scope to look in the cylinders it will help a ton... I've had the heads crack in the ports.. take the manifold off, plug the bolt holes, and pressurize the cooling system and look down the ports..
I made a plate and covered the bottom water port, and another one for the top of the head, with a port on it.. Filled with coolant, and then attached an air hose and regulated it to 7-10 psi.. Then just pressurized the block and head..

Had block and head issues..

JD G water in cylinders

More G's

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