Allis 190
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=13160
Printed Date: 01 Feb 2025 at 6:44am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Allis 190
Posted By: JerryM(IL)
Subject: Allis 190
Date Posted: 30 May 2010 at 5:31pm
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Was round baling hay today with the 190. I recently tuned ,plugs cap points and rotor. I timed it 26 degrees before top dead center at 2200 rpm's. Okay this machine seems to have an errant missed cylinder at around PTO speeds. As it heats up to working temperauter it sometimes gets worse seems like a dead cylinder but dont believe so. Oil never shows water, water never shows oil. I t has a new coil so spark is good. When its working temperature and shut down it is extremely hard to start. Is this fuel vaporization? It has the mechanical pump and fuel line around the back of the block could the fuel be boiling? As for the errant miss it is erratic and not timing or spark? a valve? or could this also be fuel troubles? Any help will be great.
JerryM(IL)
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Replies:
Posted By: Hurst
Date Posted: 30 May 2010 at 6:21pm
Have you pulled the plugs to see if they are showing anything? Did you replace the condenser when you did the tune up?
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1979 Allis Chalmers 7000
5800 Hours
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Posted By: JerryM(IL)
Date Posted: 30 May 2010 at 6:46pm
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Yes the plugs show some but not excessive over fueling but are all ash grey at the tips, carbon from the gas not oil. Also new condensor at tune up new air cleaner. This errant miss is worse on rough ground, but I know all the wires are snug new copper ones and well crimped. Could it be ballist resitor break down? I will run a compression test in a day or two but believe all the cylinders run 130 or better. This miss is wide spread might my one and a half rounds in the field then a subdued pop(miss) then make another round before it happens.
JerryM(IL)
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Posted By: Hurst
Date Posted: 30 May 2010 at 9:01pm
Is it an actual miss or just a pop from the exhaust. If it's just a pop from the exhaust, it could be an air leak into the exhaust causing any raw fuel in the exhaust to combust in the muffler.
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1979 Allis Chalmers 7000
5800 Hours
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Posted By: jls
Date Posted: 30 May 2010 at 10:39pm
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might check for slop in the Distributor shaft. mine gave me fits until I replaced it with a reman unit. I found out there is a lube schedule for it that Dad or I never did.
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Posted By: JerryM(IL)
Date Posted: 31 May 2010 at 1:23pm
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Okay I do have a cracked exhaust manifold on the tractor. I do have a replacement in the shop better get it planned and mounted, which I intended to do 3 years ago. Thanks all for the help, Hurst that now makes sense.
JerryM(IL)
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