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John Deere Tractors Discussion Forum
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Re: JD 6068 engine blowing steam from blowby

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d9gdon

01-28-2013 11:15:30
184.6.190.86



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[quote="richardinnz"](quoted from post at 22:24:30 01/27/13)
I think I found the problem. This thing has an air compressor mounted on gear drive on the right side of the engine. I'm going to take it off and check the seals before I pull the engine and take the pan off.




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d9gdon

01-28-2013 18:09:42
76.1.99.192



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 Re: JD 6068 engine blowing steam from blowby in reply to d9gdon, 01-28-2013 11:15:30  
No luck. I pressurized the coolant line of the compressor with shop air with the outlet blocked off while I had the bottom cover (pan) off it and saw or heard no leak at all.
I found the radiator fins stopped up with old oil and dust. It's a blower fan so evidently something leaked onto it and plugged it up.

It's pointing to an overheat situation, but it should have been protected by a high temp kill switch according to mfr. Next step is to pull engine and drop pan to pressurize cooling system.

Still could be pinhole in liner because of no corrosion inhibitor as well.

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Tim S

01-28-2013 19:14:32
75.49.0.238



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 Re: JD 6068 engine blowing steam from blowby in reply to d9gdon, 01-28-2013 18:09:42  
If you can pressurize the radiator with a tester that will help prove a liner failure, sounds like where you pressured it up is only the oil cooler...



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d9gdon

01-29-2013 04:40:22
76.1.99.192



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 Re: JD 6068 engine blowing steam from blowby in reply to Tim S, 01-28-2013 19:14:32  
My pressure tester wouldn't fit the radiator cap. I'm going to try to find one today.

The air compressor gets its coolant supply from a line that comes out of the water pump thru the compressor and back into the side of the block. I pressured the supply line with the return blocked off to see if the compressor head gasket was blown which would dump coolant in its crankcase and mix with engine oil shared at the gear drive.

I need to look in the manual, but is the oil cooler mounted on the side of the block as I didn't see any lines going to the radiator? I worked on a 450C dozer and it's cooler was under the oil filter.

I have CTM 104 which I'm calling the service manual.
This post was edited by d9gdon at 05:07:30 01/29/13 4 times.

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d9gdon

01-29-2013 05:21:23
76.1.99.192



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 Re: JD 6068 engine blowing steam from blowby in reply to d9gdon, 01-29-2013 04:40:22  
I looked at the oil cooler in the manual. I'll test it first today. Supposed to rain though and this won't fit in the shop right now.



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d9gdon

02-03-2013 06:38:42
76.1.99.192



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 Re: JD 6068 engine blowing steam from blowby in reply to d9gdon, 01-29-2013 05:21:23  
OK, I want to update this and try to get some more help.

I pressure tested the oil cooler and the air compressor and they're both good. I wasn't able to find a radiator pressure tester, but it wouldn't have done much good as you can't just jerk the pan off this engine cause it sits in a cradle with supports underneath that are too close.

I put everything back together and ran it with the overflow tube in a bucket of water. Had quite a few bubbles at first and then a few more after a couple of minutes, then the bubbles stopped. I let it run for 30 minutes or more while checking for any bubbles, but had none. I noticed in the manual that you're supposed to bleed the system of air when you pull it down as far as I had it, but that was after the fact. I pulled the oil plug on it the next morning and no sign of coolant. I ran it 30 more minutes and no bubbles at all this time. We ran the hydraulics on it to put a load on it too.

So I figured that the little bit of water in the oil that I'd found originally (just enough to be noticeable and cause the steam out the blowby) had came from a pretty violent 4" rain that we'd had a couple of weeks ago. I figured that the rain cap had gotten blown up and an exhaust valve was open to the cylinder.

We decided to start crushing again on Thursday. As soon as we started putting a load on it, it blew coolant out of the overflow tube but stopped shortly after. It's a little low on coolant in the radiator but runs perfect otherwise with oil and temperature normal. When you add coolant to it, it pushes it back out until it gets down to the same level which is below the bottom of the radiator neck.

There is still no sign of coolant in the oil after two days of running. I'm having the crew to check for moisture in the filler cap and to make sure there's no steam coming out of blowby tube as it's out in the country and I've got an urgent miss in another 6068 in an excavator that I was moved to.

I'm wondering if combustion is getting underneath a liner flange and pressurizing the radiator causing this?

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Tim S

02-03-2013 08:51:40
75.60.192.141



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 Re: JD 6068 engine blowing steam from blowby in reply to d9gdon, 02-03-2013 06:38:42  
"Almost" every time there is a 'Ghosty' amount of blow by steam or water push it's from a failing liner. On a few times I have changed head gaskets at the owners request when this happens and every time I ended up removing the head a second time to preform a complete O/H. The exception to this is the cam shaft driven water pump...which I think is a bad design idea...



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Tx Jim

02-03-2013 09:47:54
67.142.163.26



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 Re: JD 6068 engine blowing steam from blowby in reply to Tim S, 02-03-2013 08:51:40  
Quoting Removed, click Modern View to see

Amen. Makes one wonder what the JD engineer was smoking that day when he dreamed up a gear driven water pump.



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