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John Deere Tractors Discussion Forum
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1939 John Deere H

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1951g

01-19-2007 12:35:07




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I have just rebuilt the motor on a 1939 JD H and I'm having problems with oil leaks. I had the block bored .060 over and new head gasket and head rebuilt. My problem is I'm getting a real slow leak of oil that is dripping off the bolt under the #2 cylinder that connects the frame to the block. It's not alot but I'm trying to figure out where it's coming from. I removed the bolt but didn't see any oil up in the bolt hole. I was guessing maybe it's from the head gasket but I did torque that down to the recommended values so wasn't sure about that either. Also, I used copper coat on the gasket and have never had problems with other tractors I've restored in the past using that method. Any ideas?

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P Browning

01-19-2007 15:29:35




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 Re: 1939 John Deere H in reply to 1951g, 01-19-2007 12:35:07  
Dang -- bummer! I just came in from laying down under mine Little Johnny to see if there was any obvious thing -- there isn't. Because of your second comment that the leak doesn't involve the oil pressure line, I am taking that as a clue that the oil you see is associated with the rear cap screw, support frame to block, and that IS baffling. Loosen the plug shield on the right side to see if (by chance) we have seepage at the sparkplug. How confident are you with the gasket between the block and main case? Hopefully, you applied some gasket dope on both sides of the gasket because that one can be a challenge. You might also try a retightening of the nuts that secure the block to the main case. From what you are telling us on the way you did your head gasket, I think that would be the last place I'd look. And no -- those tapped holes on the bottom of the block do not lead anywhere -- they are fully blind. We would love to hear back. My two cents! (PatB)

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1951g

01-22-2007 08:26:31




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 Re: 1939 John Deere H in reply to P Browning, 01-19-2007 15:29:35  
Yes, I used the copper coat on gasket. I took it out and pulled my A around the yard to help seat the rings. Also put cardboard in front of radiator to help get temp up. After doing this several times around the shop. I let it cool down and torqued the head bolts down to 180 for oil stud and 96 for all other bolts. I did get some movement when I did this so maybe this fixed it. However, I had these torqued to those specifications the first time as well. I'll get it out once weather permits again and see. Thanks.

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1951g

01-19-2007 13:46:34




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 Re: 1939 John Deere H in reply to 1951g, 01-19-2007 12:35:07  
I've also checked to make sure the oil wasn't coming from the fitting on the maincase where the oil line goes to the guage.



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dds-inc

01-19-2007 19:17:15




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 Re: 1939 John Deere H in reply to 1951g, 01-19-2007 13:46:34  
This is quite obvious to me. seems like its coming from the oil filter area. or am i reading wrong.



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1951g

01-22-2007 07:58:49




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 Re: 1939 John Deere H in reply to dds-inc, 01-19-2007 19:17:15  
Actually, it's coming from above the oil filter area. It's on the bolt that holds the front frame to the block. So it can't be the oil filter but not sure where else it could be coming from. My first reaction was it's my block that's cracked, but then wouldn't I see water first since that's on the outside. The only other thing I can think of is the return trough from the rocker arms back to main case is centered and on bottom of block. Maybe I have a crack there.

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