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Allis Chalmers Discussion Forum
Show Parts for Model:

Allis Chalmers 1947 WC

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Alan Taylor

05-29-2013 16:45:28
203.168.51.242



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My tractor has the dual fuel manifold and as we can
no longer obtain low grade fuel here in Australia
I find that it does"nt run too well on gasolene
when it is hot. Do I need to purchase a gas manifold
or can I make adjustments to existing manifold and carby?

Thanks for any help you can give me




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thebigyellowtruck

05-31-2013 04:55:47
69.136.152.211



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 Re: Allis Chalmers 1947 WC in reply to Alan Taylor, 05-29-2013 16:45:28  
My wd had the dual fuel manifold on it when i bought it. I only ever used gasoline in it because i was told there was supposed to be a small starter tank for gas and the main tank for kero. Mine only has the main tank though. I switched over to a gasoline manifold after a year because the original was very thin and cracking. Its been giving me fits since i swapped it. I think it was the rusty main jet for the carb though because i replaced that before spring planting and the tractor is running great now. Just make sure your fuel system is clean and there shouldn't be an issue running it on just gas.

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EricB

05-30-2013 22:26:31
70.70.49.89



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 Re: Allis Chalmers 1947 WC in reply to Alan Taylor, 05-29-2013 16:45:28  
I have a 1947 WF with the original Kero set up and there has never been any problem running it with gas when hot but like Stu says keep it to 170 degrees F.



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stu (ON)

05-29-2013 17:28:17
70.55.47.24



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 Re: Allis Chalmers 1947 WC in reply to Alan Taylor, 05-29-2013 16:45:28  
Sounds like you may not have an original manual, so I will just mention a couple of things from WC Operators Manual, which is same as info from early WD Operators Manual.
The tractor should have come equipped with 2 manifold covers. Use the one marked "K" for distillate and the one marked "G" for gasoline.

Try to keep the operating temperature down to 170 degreesF through use of shutters or curtain, whatever yours is equipped with.

It seems you have possibility of three carbs: 2 Zeniths & 1 Marvel Schebler.

Instruction for 3 screw Z is:

Adjust throttle stop screw on plate arm to control idle speed. For fuel mixture at idle speed, adjust needle screw on front top of carb; turn in for richer & start 1 1/2 turns out. For fuel mix at working speeds, adjust main jet screw on lower front of carb; turn out for richer & start 2 to 3 turns out depending on fuel & atmospheric conditions.

Instruction for 3 screw MS is: same as 3 screw Z but main jet adjusting needle is on front top of bowl.

Instruction for 2 screw Z is: Idle control needle is on front of upper body; turn in for richer and adjust for desired idle speed. Main jet needle on bottom of fuel bowl, turn out to make richer. Adjust by turning in until motor misses, then back out until engine runs smooth. For constant heavy loads, run a little rich.

Hope this helps,

stu

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Alan Taylor

05-30-2013 16:15:32
203.168.51.242



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 Re: Allis Chalmers 1947 WC in reply to stu (ON), 05-29-2013 17:28:17  
Thanks stu for your reply
I do have an operators manual but don't have
the cover marked G so maybe I could make up
a blanking plate that would do the same job?

al



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