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8n oil in radiator

grandpa Love

grandpa Love

Well-known Member
Smokey the 8n is being worked on and I had the bottom hose off radiator to replace it. I filled the radiator and saw this down in there. Kept pouring water in until it floated out. Oil? Radiator stop leak? There were a few bubbles in the radiator with tractor running. Nothing steady.... thought maybe just a bit of trapped air? Or head gasket?!
cvphoto31346.jpg


cvphoto31347.jpg
 
(quoted from post at 16:13:45 07/28/19) Cracked block or head with that much oil in the water
Click to expand...

SV, this is a "flathead" with NO oil passages in the head at all (as OHV engines have for rocker oiling), and NO oil passages above the main oil gallery, which is quite low down on the block.

Some have speculated it's POSSIBLE for a RARE crack low down in the block to allow oil to sneak from the oil gallery into the coolant, but this is EXTREMELY rare, if even possible.

I have never seen a post on here that it's actually happened to a specific engine, just speculation that is MAY be possible.

The most LIKELY cause is combustion products sneaking past a leaky head gasket into the coolant over MANY hours of operation, and condensing into an oil sludge.
 
I rebuilt Dad's 8n back in the '80s. We had found oil in the radiator before the rebuild. Since it is a flathead engine, I am not sure how the oil got into the cooling system(and that has been 35-37 years ago), but the overhaul cured the problem. Mark.
 
Looks like oil to me. Hard to say if it might be a head gasket or cracked block. If you have an inspection camera you might look in the cylinders. I bet if you drain the oil there will be water in the pan.
 
I'm going with a head gasket.

Is it overheating, mystery coolant loss, blowing coolant even before it gets hot?

A leaking head gasket combined with major oil consumption could theoretically cause that.

So could someone accidentally dumping oil in the radiator. Seen it happen!
 
Changed the oil twice in this tractor,once when I got it then 4-5 hours of use later. Mainly to put thicker oil in. Oil had no water but was already black as coal.
 
No temp gauge on it....but we have run it for several hours on killer hot days, never blew water out. Smoked terrible, but didn't use much,if any oil.
 
I would be inclined to think it was a head gasket then. Are you mysteriously loosing any coolant? You might be getting some water in the cylinders. Walmart has a lizard camera which is helpful to see in places like that. You can go in through the spark plug hole and inspect the cylinders to see if there is anything there that shouldn't. I had a head gasket go out on my work truck and when I looked in the cylinders some of them had a teaspoon of water. That's not good to leave for any length of time.
 
Haven't noticed coolant loss. But I think we are going to order a head gasket. Hoods already off from us clean gas tank ... halfway there! Lol.
 
Somebody used a lot of sealer to try to get a leaky head gasket to hold against the compression pressure pushing burnt oil into radiator. In running you should have seen the crap floating on top of coolant in radiator. That is unless something else was able to plug the leak. I had that back in the early-mid 80's and just happened again this past year that the gasket went out again for second time. I think the first time machine shop planed head and block at same time they bored engine to put the thick wall sleaves in that DAD did not like. Rings and sleeeves still in good shape and tractor was a heavy worker for years. 44 2N bought new in May of 44. First time we pulled the engine and took it to machine shop. This time a friend changed it at home because my health would not allow me to do it any more. Thinking back it had to have been in late 70's as after the rebuild I pulled the flail forager green chopping for cow herd that left in nov. of 80. So gasket lasted over 40 years.
 
(quoted from post at 08:21:32 07/29/19) Haven't noticed coolant loss. But I think we are going to order a head gasket. Hoods already off from us clean gas tank ... halfway there! Lol.
Click to expand...

I would pocket up and use a blue Fel-pro head gasket no sealer needed...
 
Hobo.....this one?
<img
src="https://www.yesterdaystractors.com/cvphotos/cvphoto31478.jpg">

<img
src="https://www.yesterdaystractors.com/cvphotos/cvphoto31479.jpg">
$11.00 at O'Riley's
 
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