AC 190xt has started to run rough and die
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=149979
Printed Date: 21 Jun 2025 at 5:53pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: AC 190xt has started to run rough and die
Posted By: whizone
Subject: AC 190xt has started to run rough and die
Date Posted: 30 Apr 2018 at 10:15am
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Guys my tractor went from running and idling great to starting
rough and dying after 3-5 minutes. This tractor had setup for years and I just
got it. I setup an auxiliary diesel fuel tank and pumped and primed everything
from the tank to the injectors. I am sure it’s getting fuel to the pump (broke the line loose). When it dies its acting as if its
starving for fuel. You guys have any ideas in terms of what the problem could
be as it was running good at first? It’s
a 190XT and uses the Roosa Master DBGFC 631-31AF pump. Thanks for all your
help! Love this old tractor and will see it come back to life somehow!
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Replies:
Posted By: bradley6874
Date Posted: 30 Apr 2018 at 11:01am
Next time it dies on the side pump is the timing window held on by 2 screws loosen them up let the pressure out and start it back up if it starts right up it's time to overhaul the pump get up with an expert ( injpumpEd ) on here you won't be sorry may want to let him do the injectors as well then the fuel system is good for next 30 years
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You can wash the dirt off the body but you can’t wash the farmer out of the heart and soul
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Posted By: Calvin Schmidt
Date Posted: 01 May 2018 at 5:45am
Good advice above. Been there and done that. Governor ring has deteriorated and is blocking the return line and building pressure inside the pump. Relieve the pressure and it will start right back up.
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Nothing is impossible if it is properly financed
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Posted By: injpumpEd
Date Posted: 01 May 2018 at 7:53am
Yep, these pumps don't like being brought out of retirement without freshening them up. Sits for years, then suddenly asked to work again, the flex ring almost instantly begins breaking apart. The other thing is this tractor may have been parked all those years ago simply because the pump was in need of servicing and they just didn't think it was worth it. So many places charge 1000-1500 to rebuild these old DB Roosa pumps, and in my shop they are typically half that. Now, there is an occasional cam ring, head & rotor, or housing needing replaced, but I keep lots of good used parts for that reason. To keep my customers' costs down. I am in business to make money and survive, but I've never expected to get rich doing this lol!
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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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Posted By: whizone
Date Posted: 06 May 2018 at 4:31pm
Thanks to everyone for the help.. with this forum and all the great contributors the old tractor may once again run the fields.. :) Thanks again for all the insights, you fellows are awesome.. TX.
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Posted By: plshelpme
Date Posted: 19 Jun 2019 at 10:09am
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Hey Ed will you rebuild my 190xt pump?
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Posted By: injpumpEd
Date Posted: 19 Jun 2019 at 12:46pm
I can if you aren't in a big hurry lol!
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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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Posted By: plshelpme
Date Posted: 19 Jun 2019 at 3:14pm
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Well i'm not in a real big hurry but I need to know how long it would take...Thanks... Greg
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Posted By: AndrewMandel
Date Posted: 09 Oct 2021 at 5:52pm
After one week of analyzing the problem with my newly purchased 1975 AC 185 for $100 basically given free from a generous couple.
The Mechanic they hired wasn't able to fix the issue of start and die problem and pointed out that it is a transmission problem.I know from experience that it is starving of fuel and the injection pump mechanically performs well, but where is the leak and what causes it?
After following all the recommendations from the forum and methodically going to the process of elimination physically. Dr. Allis (credit)has the answer that is clog return line caused by the rubber compression fitting line intake
that started to disintegrate(line from the fuel filter to the injection pump). Cost
$.079cents. Maybe some problems are unique such as the flex ring that started to fall apart. I cleaned the crystal ball with compressed air and soaked in gasoline 1/2 fitting wrench no need to grind for me to get the ball out. It save me lots of money by being patient. Will see how long it stays running.
This tractor runs like champion!Thanks for all the input.
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