Coolant in oil JD2630...Need Help!

Hey folks,
Was getting equipment ready to make hay. The JD2630 had not been run in a while. Started right up and ran well, but immediately noted leak up around T-stat area. Shut it down. Much to my dismay I found milkshake on dipstick. Drained pan.....ugh!!
Have no reason to suspect HG leak....was never over heated. Really only use it to rake/tedder. Always has started and run well.
Not clear why it seemed to leak up near T-stat, although truth be told....not clear where leak source really was.
Tried to research other causes....found one possibility ....the oil cooler O-rings. Anyone out there have any thoughts?
Sure could use some assistance in getting pointed in the right direction.
Thanks in advance!
 
Guess I am not understanding how cylinder liner(s) would go bad all at once..... but that is REAL discouraging. Might not be worth the major surgery I suspect will be required for repair :cry:
 
Ooh yes, it is a common issue on older engines,, the liners erode around the bottom and all at once you have water in the oil,,you want to think it's the head gasket,,and go through the trouble to change that,,only to find you are still getting water in the oil ,,so the head comes off again,,if you want to prove it drop the oil pan refill it with water and use a radiator tester to pump up some pressure in the system and look up into the engine to see where the water is going..
 
"Guess I am not understanding how cylinder liner(s) would go bad all at once"

Doesn't have to be that "all the liners have gone bad at once", all it takes is ONE pinhole in ONE of the liners!
 
They do, just sitting in the shed. I know that first hand. A few years ago I had my tractors ready to go for haying, fresh oil changes, filters,
greased, etc. I was away from home about 5 days, came back all ready to start haying, and out of habit, pulled the dipstick to double check oil
level, and it was full to the top with milky oil. Popped a pinhole in a sleeve just sitting in the shed. So.............a complete overhaul was the result.
 
Thank you all for the info.
Might try to pressurize cooling system....but appears this is likely the case. Was hoping the oil cooler O-rings might be the culprit since easier fix.
Sadly, this is very bad news. Not sure the tractor is worth the cost of total overhaul ????
I really appreciate the help. You folks are great!
 
Thank you all for the info.
Might try to pressurize cooling system.... but appears this is likely the case. Was hoping the oil cooler O-rings might be the culprit since easier fix.
Sadly, this is very bad news. Not sure the tractor is worth the cost of total overhaul ????
I really appreciate the help. You folks are great!
 
Thank you all for the information.
Might try to pressurize cooling system . However it appears this is likely the case. Was hoping the oil cooler Orings might be the culprit since easier to fix.
Sadly, this is very bad news. Not sure the tractor is worth the cost of total overhaul. ????
I really appreciate the help. You folks are great!
 
Thank you all for the guidance.
Might try to pressurize cooling system . However it appears this is likely the cause. Was hoping the oil cooler Orings might be the culprit since easier to fix.
Sadly, this is very bad news. Not sure the tractor is worth the cost of total overhaul. ????
I really appreciate the help. You folks are great!
 
I do not think your understanding how a sleeved motor would be overhauled. The Liners/sleeves just slide into the cylinder box. The piston and rings are inside this replicable sleeve. IF you did not run the motor long then the crankshaft and all its bearings would still be good. So you would be looking at an overhaul kit which would be around $1500-2000 aftermarket for that tractor.

Like TimS posted it is easy to check. Just drop the oil pan and use a coolant system tester to pressurize the cooling system. You usually can see water/coolant dripping after just a few minutes. IF it is coming off one or more of the sleeves then you know what it is. If it is coming down from around the cam it would be more likely a head gasket.

I would bet a sleeve as the corrosion/cavitation can still continue while not running. Actually what happens is the leak is a very small pin hole size leak. So while you where running it the last time it may have been leaking so slow it might have been evaporating the water out as fast as it was going in. When you parked it the small leak would have slowly puddled a larger amount of water in the oil. Then when you started the tractor it mixed the water and oil into a milky looking mix.

The oil level should have checked over full.
 
Sorry for multiple posts. Kept getting debug error message so tried changing post slightly. Didn't realize they somehow were being posted. Then unable to delete! Oh well. Guess y'all got the drift....THANKS!
 
JD...Excellent info!
Tractor was not run long at all....not even a minute. I saw water seeming to come from up near thermostat area and shut it down.
Not sure what to make of that if cause is hole in liner. Doesn't point at head gasket either. Looks like I need to pressurize as recommended and try to see where water is going.
Thanks again.
 
got looking at overhaul kits on this site. Pretty confused by different prices on what seemed to be same kit (???)
Any recommendations on best option...assuming I can get away with minimal overhaul...?
 
So..looks like roughly $700-800 for kit. Anyone have a ballpark figure from experience on what machine shop bill for head work ought to be?
 
(quoted from post at 18:49:00 08/05/18)
(quoted from post at 22:47:46 08/05/18) 90% of the time it's the liners....Darn it,,and they go with out warning..

Liners???

The wet sleeves cavitate through when the antifreeze does not have active corrosion inhibitor . Either change the antifreeze every few years or test and replace the inhibitor.
 

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