wc running rough

	This site is not affiliated with AGCO Inc., Duluth GA., Allis-Chalmers Co., Milwaukee, WI., or any surviving or related corporate entity. All trademarks remain the property of their respective owners. All information presented herein should be considered the result of an un-moderated public forum with no responsibility for its accuracy or usability assumed by the users and sponsors of this site or any corporate entity.
	The Forum	Parts and Services	Unofficial Allis Store	Tractor Shows	Serial Numbers	History

Forum Home > Allis Chalmers > Farm Equipment

New Posts

FAQ

Author

Message

Topic Search

Topic Options

alan-nj

Orange Level

Joined: 12 Sep 2009
Location: oxford, nj
Points: 845

Post Options

Post Reply

Quote alan-nj

Report Post

Thanks(0)

Quote

Topic: wc running rough
Posted: 12 Jul 2010 at 8:56am

the wc that i'm putting together is running rough. i've got a rebuilt marvel 464 carb on it. it will only run smooth when the choke is only about 1/3 open. when i open the choke wider, engine runs rough. i adjusted the power jet, helped a little. adjusting the timing with the mag also helps, but i'm at the end of adjustment with the mag, can't go any further. checked for intake manifold leaks, can't seem to find any. looking for ideas....alan

Sponsored Links

Dave(inMA) View Drop Down

Orange Level

Joined: 12 Sep 2009
Location: Grafton, MA
Points: 2395

Post Options

Post Reply

Quote Dave(inMA)

Report Post

Thanks(0)

Quote

Posted: 12 Jul 2010 at 11:08am

So it's hunting for gas.... Maybe still some dirt in the carb, or something obstructing the fuel flow to the carb?

WC, CA, D14, WD45

Gerald J.

Orange Level

Joined: 12 Sep 2009
Location: Hamilton Co, IA
Points: 5636

Post Options

Post Reply

Quote Gerald J.

Report Post

Thanks(0)

Quote

Posted: 12 Jul 2010 at 11:33am

Idle it down, open the choke, adjust the idle mix screw, then run it fast and adjust the power just, repeat a few times. you have to override the governor for the fine parts of these adjustments because it will compensate and hide changes otherwise. Or you watch the throttle arm and adjust for minimum throttle.

With a rebuilt carb, one wouldn't expect fuel path clogs in the carburetor or air leaks at the throttle shaft but they are possible. Check for good fuel flow with the float bowl drain plug removed. It should be the size of a pencil. Fuel lines that old can be nearly closed with varnish, as can the inlet adapter screen on the carburetor. Check the float level again.

Gerald J.

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
alan-nj Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 12 Sep 2009 Location: oxford, nj Points: 845	Post Options Post Reply Quote alan-nj Report Post Thanks(0) Quote Reply Topic: wc running rough Posted: 12 Jul 2010 at 8:56am
	the wc that i'm putting together is running rough. i've got a rebuilt marvel 464 carb on it. it will only run smooth when the choke is only about 1/3 open. when i open the choke wider, engine runs rough. i adjusted the power jet, helped a little. adjusting the timing with the mag also helps, but i'm at the end of adjustment with the mag, can't go any further. checked for intake manifold leaks, can't seem to find any. looking for ideas....alan

Sponsored Links

Dave(inMA) Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 12 Sep 2009 Location: Grafton, MA Points: 2395	Post Options Post Reply Quote Dave(inMA) Report Post Thanks(0) Quote Reply Posted: 12 Jul 2010 at 11:08am
	So it's hunting for gas.... Maybe still some dirt in the carb, or something obstructing the fuel flow to the carb?
	WC, CA, D14, WD45

Gerald J. Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 12 Sep 2009 Location: Hamilton Co, IA Points: 5636	Post Options Post Reply Quote Gerald J. Report Post Thanks(0) Quote Reply Posted: 12 Jul 2010 at 11:33am
	Idle it down, open the choke, adjust the idle mix screw, then run it fast and adjust the power just, repeat a few times. you have to override the governor for the fine parts of these adjustments because it will compensate and hide changes otherwise. Or you watch the throttle arm and adjust for minimum throttle. With a rebuilt carb, one wouldn't expect fuel path clogs in the carburetor or air leaks at the throttle shaft but they are possible. Check for good fuel flow with the float bowl drain plug removed. It should be the size of a pencil. Fuel lines that old can be nearly closed with varnish, as can the inlet adapter screen on the carburetor. Check the float level again. Gerald J.