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766 LOSING / USING WATER

N

NIGHTFARMER

New User
My IH766 is using/losing water. I cannot find any in the oil and it has not been a problem starting so I dont think its running into the cylinders. There is a milky looking oil on the underside of the dipstick/oil filler stopper. It is probably using 1/2 gal per run hr, so I would think this would be obvious in the oil if it was going into the crankcase? Since it is on the stopper, I am thinking it is vaporizing somehow, just dont know where. Any advice would be greatly appreciated.
 
Does that have wet sleeves? I'm into a 1020 Deere right now that was doing the exact same thing. It had a cracked sleeve (wet sleeves). The darned thing got pitted and cavitated so bad it finally cracked through. The leak was right about where the rings stopped in the sleeve when the piston was all the way down,so it leaked into the oil when it was shut off and must have been pushing it up and vaporizing it in the exhaust when it was running.
 
Sounds like a hole in a cylinder sleeve to me. Had an 886 that started with those symptoms and then a few engine hours later it got bad enough where it showed up in the oil.
 
If that engine is like the one in a 966 with an oil cooler That would be a place to look. My father inlaw had 3 go bad in 5 years. He had very hard water when he started using soft water it didnt happen any more.
 
I had a 76 766 that the day after an oil change and using it had shiny metallic in the oil! OH CRAP what happened to it. Had to leave it sit that spring till after planting was done. Pulled the oil pan looking for a bad bearing and found nothing. Had a friend come over to look at it, First thing he did was to take the radiator cap off. Have you ever put alum-seal in it? No. Did your start it in the winter when it was real cold? Yes. He put the cap back on and said you need an 0 ring set for the oil cooler. Got a new set of 0 rings and put in the oil cooler new oil and filter and started it up. No more problem. I would start there its a cheap fix $5 for the 0 rings. Sounds dumb put that's what it was. Bandit
 
Sounds like a problem in older wet sleeve engines called hydraulisis. The sleeves actually strech and contract when the cylinder is in the Power Stroke. When expanded on the rod thrust side the sleeve pushes coolent away, when it contracts it causes a void and air bubbles form on the sleeve. When the power stroke occurs again the air bubbles explode working simular to a water jet cutter. Anyone who has ever rebuilt wet sleeve engines has seen this pitting on one side of sleeves. Todays modern engines now support the sleeve midway down rather than the bottom to reduce this problem. O ring deteriation is a result of movement of the sleeve base grinding sediment between the block gland, O ring, and the sleeve. This lower sleeve movment could also cause the top sleeve gland to crack on some engines.
Coolent filters and chemical treatments were developed to reduce this phenom.
 
Do an oil sample of your crankcase oil. (as long as it is not fresh oil)
Look for Sodium and Potassium as they are found in antifreeze but not in oil. If you have some ppm of both, you may have antifreeze getting in some how.
 
I just finished rebuilding a 766 2 weeks ago for the same problem. How I found was dropped the pan and looked up through the bottom and found a pin hole in the sleeve. That electrolysis is pretty hard on wet sleeves. Even harder was to get all that slimmy oil/water mess out of everything.
 
Thanks to all for the suggestions! The o-rings in the oil cooler post got me to thinking, though. I had a seal in the injector pump go bad back in the summer and flooded the crankcase with oil. Any chance this may have damaged the o-rings and causing the leak now? Probably only wishful thinking, but sure would be better than a rebuild. Thanks again.
 
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