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Author Topic: 340 Farmall gas tractor.  (Read 5092 times)

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Offline brooksbeefarm

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340 Farmall gas tractor.
« on: October 03, 2015, 06:47:45 pm »
What's wrong??? Had a hydraulic line leaking, the fluid shooting out was milky looking and tractor was missing on #2 cylinder so i thought i would put points condenser and new plugs in it. Well i had to put a cheater bar on the plug wrench to get #2 plug out? I checked the oil and it was milky looking also? Pulled the head thinking head gasket was leaking, nothing i could see wrong with head gasket. Took the head to machine shop had it microwaved and tested, found nothing wrong? The hydraulic oil had antifreeze mix in it and the motor oil also?( the milky looking problem) no cracked block or crack in the sleeve? I will wash what milky looking stuff out of the engine and differential with diesel  oil and put it back together? Got any idea what i should look fore before i do??? Jack
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Offline iddee

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Re: 340 Farmall gas tractor.
« Reply #1 on: October 03, 2015, 07:23:16 pm »
Is that engine piston against block, or sleeved?
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Offline brooksbeefarm

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Re: 340 Farmall gas tractor.
« Reply #2 on: October 03, 2015, 08:05:11 pm »
Wet sleeved. No crakes in sleeves? Jack
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Offline iddee

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Re: 340 Farmall gas tractor.
« Reply #3 on: October 03, 2015, 08:27:35 pm »
Either an unseen opening in the head gasket or a seepage up through #2 sleeve would be my guess.
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Offline brooksbeefarm

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Re: 340 Farmall gas tractor.
« Reply #4 on: October 03, 2015, 09:45:21 pm »
One thing i forgot to mention, the thermostat  was blown out of it's housing into the top hose? Had to be some type of pressure build up. The other thing i don't understand, the hydraulic system and the motor are in no way connected, so the hydraulic oil and motor oil can not mix, but they both had antifreeze in them that made both milky looking? I'm with you on a bad head gasket,but why would the differential, transmission, and hydraulics, have antifreeze mixed in it also? They all run off the same hydraulic oil.Jack
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Offline iddee

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Re: 340 Farmall gas tractor.
« Reply #5 on: October 03, 2015, 10:27:57 pm »
Most hydraulic systems get milky from condensation water. They expand the fluid when hot and draw in moist air through the vents  while cooling. The moisture condenses and it is repeated each time the hydraulics heat up. Are you sure it was antifreeze and not just water?
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Offline brooksbeefarm

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Re: 340 Farmall gas tractor.
« Reply #6 on: October 03, 2015, 11:31:45 pm »
It was in the motor, not sure in the hydraulics,i was thinking condensation also because it sets outside, but when they both had that milky look at the same time, i couldn't figure out how that could happen when nothing was attached to the other by gasket or fluid lines? Jack
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Offline iddee

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Re: 340 Farmall gas tractor.
« Reply #7 on: October 04, 2015, 05:48:42 am »
The motor got it recently. The hydraulics have had it awhile.
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Offline Riverrat

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Re: 340 Farmall gas tractor.
« Reply #8 on: October 04, 2015, 09:08:44 am »
I'm thinking in a wet sleeve you may have a leak around the sleeve that opens up as the engine warms up or a small crack in the head.  Did you check the head and block to make sure mating surfaces wasn't warped.  This will make the gasket leak when it gets warmed up.  It may not be noticeable where the leak is if it just started. I have seen guys double up on the head gaskets to seal leaks from a warped head but wouldn't recommend it. Fact is somewhere you got a leak.  If there was enough pressure build up to shove the thermostat up into the hose you have compression leaking into the cooling system.  Are you seeing any steam from exhaust after it has ran for awhile.  you might check the compression when its cold on  number 2 then again after it warms up. Its not uncommon for the hydraulic fluid to be a milky color from  tiny air bubbles.  Hydraulics on a tractor run an open hydraulic system and air is allowed in through vents.  Fluid in all the tractors I run hydraulics on and my surface grinder along with skid loader all will show a milky look to the fluid when coming out of the hose
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Offline brooksbeefarm

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Re: 340 Farmall gas tractor.
« Reply #9 on: October 04, 2015, 09:41:03 am »
The machine shop took all the valves out and run the head through all there test and didn't find anything wrong? A friend of mine that rebuilds JD tractors is going to pressure check #2 cylinder, he couldn't see anything wrong with the head gasket or see any sign of warp on the head or block, or cracks in the sleeve? He said cracks in the sleeve are usually easy to see. I do remember seeing steam a few times when i first started it, but it cleared up after it warmed up, i just thought it was condensation burning off from setting out side.The head gasket was the kind with metal on both sides, so if it had a leak it might be hard to see? Jack
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Offline Ray

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Re: 340 Farmall gas tractor.
« Reply #10 on: October 04, 2015, 12:26:01 pm »
How hard did the other 3 spark plugs come out? If only #2 spark plug was stuck that bad, it suggests the issue is above the piston on #2 cylinder. The thermostat suggests a high pressure in the cooling system, probably causing a leaky head gasket.    That's my 2 cents, good luck.
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Offline LazyBkpr

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Re: 340 Farmall gas tractor.
« Reply #11 on: October 05, 2015, 09:30:52 am »

   Everyone else already said what i intended to.
   Nothing in the cooling system would blow the thermostat out except compression leaking into the cooling system, and then it should have blown the release on the radiator cap and you would have had coolant everywhere, so that has me a bit confused...   Is the cap of the type that has a pressure release on it?
   I have seen MANY times where the coolant corrodes internal components over time and eventually creates a pinhole in the sleeves that is difficult to find without doing a pressure check. I would have done that before I pulled it apart to narrow down where exactly the leak might be. Are the sleeves in that o ringed and held in place by a wire ring in the head gasket or Press fitted?
   Usually compression leaking will "cut" a groove where ever it is leaking and it will be easy to see, even in a metal head gasket, so I am thinking it may be the aforementioned problem of a pinhole somewhere in the number two sleeve.
   Coolant in a cylinder usually also makes that cylinder CLEAN compared to the ones that are not leaking, meaning no carbon build up on top of the piston or in the head cavity. Not sure if you looked/noticed that when you pulled the head or not.
   I have seen seals on hydraulic pumps leak and allow coolant into the system, but that requires a system where the pump is mated to the block with only a single seal, i believe on that the pump is separate, so have to completely agree with Iddee.
   Let us know what you find out!
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Offline brooksbeefarm

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Re: 340 Farmall gas tractor.
« Reply #12 on: October 05, 2015, 10:25:00 am »
I will let you know.I loaded it up and took it to my friends shop so he could run test on it with his equipment. Didn't want to put it back together and have the same thing happen if i don't have to. He buys older JD tractors, rebuilds them, paints them, and sells them (they look like new) he even ships them over sea, and rebuilds them for people all over the US of A. We like to fight over the RED and GREEN tractors. :D Jack
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Offline iddee

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Re: 340 Farmall gas tractor.
« Reply #13 on: October 05, 2015, 10:35:13 am »
I'm guessing he will put a new sleeve in #2. Maybe a full set of pistons and sleeves, just to be sure.
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Offline Mikey N.C.

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Re: 340 Farmall gas tractor.
« Reply #14 on: October 05, 2015, 11:21:01 am »
Does it have a hydraulic oil cooler and engine oil cooler
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Offline Riverrat

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Re: 340 Farmall gas tractor.
« Reply #15 on: October 23, 2015, 09:08:15 pm »
Any word on what was found in the engine
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Offline brooksbeefarm

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Re: 340 Farmall gas tractor.
« Reply #16 on: October 23, 2015, 11:19:20 pm »
Got it back last Tuesday, nothing found, he cleaned the engine and hydraulic oil with diesel fuel. put new head gasket on drove it around, let run for 45 min. changed the oil and filter again drove it around again and and let it run for 30 minuets, checking the oil and filter again. He said it must have been the head gasket, but keep an eye on it? I need to take it where i had the logging done and cut the sprouts sticking up everywhere, that should test it.Jack
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