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SHADOW View Drop Down
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Joined: 06 May 2017
Location: Ohio
Points: 2 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SHADOW Quote  Post ReplyReply Direct Link To This Post Topic: Allis B
    Posted: 06 May 2017 at 5:45pm
I have a 1939 Allis Chalmers B. I have been trying to start the tractor and it does not seem to be getting any fuel to the cylinders. I have  checked the timing at least 3 times and it is correct. I have checked the compression on all 4 cylinders and it ranges from 50 lbs to 70 lbs. I am at a loss for what to check next. any ideas.
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ac fleet View Drop Down
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Joined: 12 Jan 2014
Location: Arrowsmith, ILL
Points: 2337 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ac fleet Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2017 at 6:19pm
They tell me an engine won't run on less than 80 pounds.---I don't believe it,---BUT with comp. lower than 80, they won't run very well, ---might also be hard to start unless you pull start them, and not have much power. thanks; ac fleet
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Randy WI View Drop Down
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Joined: 22 Jan 2014
Location: Ogema, WI
Points: 845 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Randy WI Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2017 at 6:33pm
50 to 70 lb may not be enough to make enough vacuum to pull gas into the cylinder or may be your intake manifold gaskets are leaking. Randy
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Gerald J. View Drop Down
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Joined: 12 Sep 2009
Location: Hamilton Co, IA
Points: 5636 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Gerald J. Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2017 at 7:10pm
Squirt some crankcase oil into the cylinders and do the compression test again.If the pressure goes up that is a sign that the rings are worn giving the low compression. If the pressure doesn't go up that is a sign that the valves are leaking (or head gasket) and that the valves need to be ground.

Gerald J.
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Allen Dilg View Drop Down
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Joined: 12 Sep 2009
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Points: 820 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Allen Dilg Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2017 at 7:53pm
  Hello Shadow    Check the carb open the plug or pet cock under carb fuel should run steady for at least 10 sec..   As far as compression it should RUN
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CrestonM View Drop Down
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Joined: 08 Sep 2014
Location: Oklahoma
Points: 8457 		Post Options Post Options   Thanks (0) Thanks(0)   Quote CrestonM Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2017 at 8:17pm
Originally posted by Gerald J. Gerald J. wrote:

If the pressure doesn't go up that is a sign that the valves are leaking (or head gasket) and that the valves need to be ground.

Gerald J.
Or could need adjusted
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