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water in oil 39 B Deere

J

J Holland

New User
I recently completed a complete engine rebuild and after first start up had water in oil. I have a NOS block and completely
rebuilt head. Everything was done to it.First time I found water in the valve cover that had flowed back into the crankcase. New
gaskets and reinstall. Water again only this time it had leaked by both exhaust valves into the cylinders. Was told to replace the
pushrod tubes which I did. New gaskets again and reinstall only this time found water on the exhaust pushrods only. Where could the
water be coming from. Magnaflux revealed nothing. Could the head be cracked on the inside somewhere or getting by the newly
installed valve guides? Honestly I am at my witts end and into this engine for over 2000.00 .Any ideas? Thanks
J Holland
 
Very common for the pushrod tubes to rust and leak water, or too long of a bolt was used when the manifold was installed and punctured a hole in the tube. www.hanjmachining have new pushrod tubes.
 
(quoted from post at 23:28:38 02/08/22) Very common for the pushrod tubes to rust and leak water, or too long of a bolt was used when the manifold was installed and punctured a hole in the tube. www.hanjmachining have new pushrod tubes.
Click to expand...

The tubes have been replaced...
 
Your water is getting by your pushrod tubes. You should
be able to look up the tubes with a light and see where
the water is coming from. Did you smear the end of the
tubes with JB Weld to seal them?
 
I am a machinist by trade so I removed the old ones cleaned the bores to remove all scale and rust to bare metal. I measured each hole and turned brass tubing to fit. I added .003 for press fit and used aviation grade Permatex sealant to seal them with. I don't know where the water is coming from but it is driving me crazy.

J Holland
 
Procure a radiator pressure and pressurize the system , then wait for coolant to run out the oil drain plug. Not too familiar with Deeres, dont they have a crankcase cover where you can look in and see the backs of the pistons? Anyway, by time you see water running, shouldnt take long to find the source.
 
Not coming from the tubes. Not with .003 press fit and sealant. I used the old tube as a pattern and it was slightly larger by .002
With the .003 press fit and the sealant I used in the holes as well as on the tubes got to be coming from somewhere else...
 
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