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Allis Chalmers WD will not stay running |
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DPhillips ![]() Bronze Level ![]() ![]() Joined: 14 May 2023 Location: Michigan Points: 4 |
![]() ![]() ![]() ![]() ![]() Posted: 17 May 2023 at 5:55am |
I bought an old Allis Chalmers WD about two months ago and have had issues with keeping it running. I have set the timing to the “fire” position on the flywheel. I have also rebuilt the carb and I have good fuel flow to the carb. I have felt the intake manifold when cranking and there is plenty of suction. Any movement of the throttle level on the quadrant, the butterfly on carb opens to full throttle. I was told by the previous owner that the governor spring was the issue but I have replaced that with a used WD spring. I am out of ideas, PLEASE HELP!
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steve(ill) ![]() Orange Level Access ![]() ![]() Joined: 11 Sep 2009 Location: illinois Points: 87611 |
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static timing should be set to TDC ( top dead center)... after the tractor starts, the ADVANCE will make it fire at the FIRE mark... You can see that if you use a timing light..
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Like them all, but love the "B"s.
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steve(ill) ![]() Orange Level Access ![]() ![]() Joined: 11 Sep 2009 Location: illinois Points: 87611 |
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Any movement of the throttle level on the quadrant, the butterfly on carb opens to full throttle.
are you saying you have Closed and Open and nothing in between ??
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Like them all, but love the "B"s.
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SteveM C/IL ![]() Orange Level Access ![]() Joined: 12 Sep 2009 Location: Shelbyville IL Points: 8612 |
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Fire mark at full throttle.What does issues keeping it running mean? Starts and dies? How is the spark? Are you qualified to rebuild carb? I don't know what you know!
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steve(ill) ![]() Orange Level Access ![]() ![]() Joined: 11 Sep 2009 Location: illinois Points: 87611 |
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if you think you have a governor / carb linkage problem... read post #2. in this link
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Like them all, but love the "B"s.
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TramwayGuy ![]() Orange Level Access ![]() Joined: 19 Jan 2010 Location: Northern NY Points: 11742 |
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Magneto or Distributor conversion?
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DPhillips ![]() Bronze Level ![]() ![]() Joined: 14 May 2023 Location: Michigan Points: 4 |
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There is really no in between. It seems to be all or nothing.
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DPhillips ![]() Bronze Level ![]() ![]() Joined: 14 May 2023 Location: Michigan Points: 4 |
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A little more information. The tractor has been converted to a 12v electrical system. There is healthy spark when cranking. The tractor will start but then die a few seconds later. I have never rebuilt an Allis carb before but I am fairly mechanically inclined.
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steve(ill) ![]() Orange Level Access ![]() ![]() Joined: 11 Sep 2009 Location: illinois Points: 87611 |
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your carburetor / throttle lever / governor ... may all need to be syncronized together... Follow the steps in this link.. second post.
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Like them all, but love the "B"s.
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DaveKamp ![]() Orange Level Access ![]() ![]() Joined: 12 Apr 2010 Location: LeClaire, Ia Points: 6066 |
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So perform a process of eliminination. Stand alongside the carbeurator, activate the starter, and when it fires up, shoot little spritzes of something flammable into the throat... If the engine stays running in coincedence with the spritzes, it's a fuel problem. If not, it's an ignition or exhaust problem. To test an ignition problem, get an extra spark plug, disconnect one cylinder, and start the engine. Watch that extra plug's spark. Does it die off slow, or immediately upon releasing the starter button? If it dies as soon as you release the starter, you have an electrical wiring problem. Will it continue to idle at dead-slow, but stall as you try to pick up throttle? If you still see spark when it does this, the problem is insufficient spark voltage. At dead-slow idle, throttle is closed, so dynamic compression is lowest (because differential pressure is greatest). As soon as you open the throttle, that differential pressure is gone, so compression pressure jumps... and in doing so, more spark voltage is required to successfully ignite the mixture. Now connect a wire from the battery direct to the coil (hot-wire) and start it up. Does it stay running? If so, you have a wiring problem. Does it have a generator? Disconnect the generator's output... and try again... if it continues to run with generator disconnected, you have a polarity, cutout, or regulator problem. Exhaust problem you say?? Yeah. SHove a potato in your car's exhaust pipe, and it'll do the same thing. If the manifold or muffler has a big chunk of mud-dauber nest, it'll do that...
Edited by DaveKamp - 17 May 2023 at 4:49pm |
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Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest.
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