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John Deere Tractors Discussion Forum
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'G' GAS CONVERSION?

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PAT

08-30-2004 04:35:45




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How can I tell if my 1949 'G' has been converted to a gas burner? What would the cylinder compression be?




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Jak

08-30-2004 14:48:48




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 Re: 'G' GAS CONVERSION? in reply to PAT, 08-30-2004 04:35:45  
Take a plug out and see if the piston comes up to the plug hole,if it is all the way up to the hole than you probably have gas pistons in it.My 52 G had all fuel pistons with about 63 psi in each cylinder and my 53 had aluminum .090 pistons in it which produced well over 100psi per cylinder.Do you have a compression checker?Jack(TN).



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PAT

08-31-2004 04:33:55




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 Re: 'G' GAS CONVERSION? in reply to Jak, 08-30-2004 14:48:48  
THANKS JAK! THAT'S WHAT I WAS LOOKING FOR. YES I HAVE A COMPRESSION TESTER.



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DW

08-30-2004 09:52:59




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 Re: 'G' GAS CONVERSION? in reply to PAT, 08-30-2004 04:35:45  
Also there were "doughnuts" that slipped in the front of the cylinders. They effectively took up air space and thus raised the compression. My "G" had a set of these in it when I got it.



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Duane Larson

08-30-2004 08:19:23




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 Re: 'G' GAS CONVERSION? in reply to PAT, 08-30-2004 04:35:45  
PAT,
To convert the G to a gas burner, JD Attachments catalog AC-1000-(1-55) says to order
1 - AF1323R gas manifold
1 - set AF1324R pistons (c/n F1075R) with rings (aluminum)

However, one could also "high compression" a G, and I suspect some folks did both.

From a (JD?) document "Procedure to High Compression Model "G" Tractor Serial G13000 & up", the parts required are 1 - AF494 Cylinder Head (the F486R c/n used on uns G)
1 - set AF484 intake valves
1 - set AF550 exhaust valves
1 - AF1076 head gasket,
1 - gas manifold supplied by Grinnell Farm Equipment, Yellow Springs, OH.

I don't have any information on the compression psi expected with the gas conversion, and my G is a regular stock one. So, looking at the manifold (and pistons - are they aluminum or cast) should tell if it has been converted to a gasoline burning engine.

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Mike Aylward

08-30-2004 10:45:32




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 Re: 'G' GAS CONVERSION? in reply to Duane Larson, 08-30-2004 08:19:23  
Duane, this is a small matter but I have a set of the F1075R pistons for my "G" and they are cast iron. They have much the same configuration as a late "A" cast piston without quite the same dish as an M&W style piston. Hope this helps. Mike



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Duane Larson

08-30-2004 11:17:48




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 Re: 'G' GAS CONVERSION? in reply to Mike Aylward, 08-30-2004 10:45:32  
Mike,
Thanks for the correction! I had a set of aluminum pistons which I thought were F1075R but apparently they weren't - were the M&W pistons aluminum? Regards,
Duane



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