Weak G

[1949ABG]

I finally got to put my '49 G to the test the other day and was VERY disappointed. Put a #55 plow with 3 14's in the ground, and it acted like it was trying to pull 6 18's. As soon as I took it out of gear, it smoothed out and ran fine as before. Tried it again with the same result. Runs good going anywhere empty. Ideas???

 

[Carlyle hoffman]

Carb need cleaning,points need replacing, how is the valve adjust ,correct plugs ,timing correct many variables to consider. What gear or you using. Just because it is a (G) doesn't mean it is an ATOMIC WEAPON. What year is the (G), not all were same HP from start of PROD till the end.Yes under every thing being correct and adjusted, even the PLOW,it should do nicely with the 14,s.Your the DOCTOR, diagnose the PROB.

 

[old popper]

How is your compression? I can pull 3/16s in seven year alfalfa with mine. Need some weights for traction though.

 

[Kent Petersen]

all the G s after serial #13000 were the same 38 HP that number would be 1943 and up open your load jet and see if it helps

 

[BushogPapa]

Sounds like it is real "Puny"..
May be from needing a good Tune-Up..
Ignition requirements go UP as load (and throttle) are increased because of the increased cylinder pressures..
Is it Belching Black Smoke..??
Could be the Air-Inlet pipe is blocked with Mud-Dauber nests..??
Garden hose up from the bottom of the air-Cleaner will flush them out.. Yes, wash them out until there is no more muddy water..!!
Tell us what you find..
I think we are mostly spoiled by watching built JD "G"s Pulling... Actually, the "G" had about the same power as a Gasoline "A" and an "A" was not a 3-bottom tractor around here, if it didn't have a Power Block..
Ron..

 

[1949ABG]

I did all the necessary tune up stuff after I brought it home. (Some of it was real nasty.)

I think where I'm hung up is that it has a mag. What I know about magnetos you could put in a thimble and still have room. Grew up with distributors. Thus, I have no idea the condition of it. I do hear it occasionally miss just going from point A to B. Might need new parts, just don't know how to go about it yet.

 

[Resting Relics 1]

Hey 1949,
Your "G" should handle that plow pretty well unless you have it buried or she's really tired. A "G" is rated the same as a late A but that's not really a fair test because the A was tested on gasoline near the end of prodution while the G was only tested once, early in it's life on distilate, not gasoline. When a "G" is running on gas she'll probably be doing in the upper 40's for horsepower. See if you can find a dyno and have it tested before you condem it. May just need a good going over. Good Luck.
John

 

[BushogPapa]

An Original Early "G" that has the original pistons can be hard-pressed to handle a 6' Bush Hog.
I have seen original stock JD "G"s quit after pulling a sled about 50 Feet..
Now, if they have higher compression pistons in them, they Wake-Up real well.
original compression was 4.20:1 and that was all it had..
They will pull a good load but will Labor most of the time..
Ron..

 

[1949ABG]

Was told all original inside. Compression is around 60-65 lbs., so makes sense. I did put a gas intake on it.

 

[BushogPapa]

If you talk to Ray at Extreme, he can get you any compression ratio you may want and all the way up to 7 1/2" Bore..!!
There are several ways to increase compression..
One way is to simply Lengthen the Connecting Rods..

One problem with PTO equipment and an Original JD "G" is the LOW RPM gives them no room to pull down..
Increasing the engine's RPM helps a lot when pulling field equipment..but PTO RPM should not be exceeded very much on most equipment..
Ray can have this done for you..
Ron..

 

[1000yds]

Murphy's Motor Service can sell you some bolt on horsepower that will make you think you are sitting on a 3020. No one will believe my dyno, but it's easily double the stock hp.