190 XT Engine Problem
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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=40338
Printed Date: 08 Sep 2025 at 3:13pm
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Topic: 190 XT Engine Problem
Posted By: tomwestky
Subject: 190 XT Engine Problem
Date Posted: 10 Nov 2011 at 6:25am
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Checked the oil in my 190XT the other day, before some heavy work and found the crankcase completely filled....mostly diesel. What could cause that???
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Replies:
Posted By: David (in Mi.)
Date Posted: 10 Nov 2011 at 6:39am
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Most likely it is the umbrella seal on the injection pump shaft. They will get old and rot and diesel fuel from the injection pump can get by the seal and will fill the crankcase. One other place it can happen on a J.Deere , not sure if XT's have them, is through the fuel pump that pumps fuel from tank to the injection pump. The diaphram can rupsure and fuel can get to the crankcase that way also.
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Posted By: MACK
Date Posted: 10 Nov 2011 at 7:24am
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Bushing in front of pump most likely has groves worn in it from seals and needs replaced to. MACK
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Posted By: HagerAC
Date Posted: 10 Nov 2011 at 8:20am
Ill second the umbrella seals, but it could also be the bushing as Mach Stated. Might be time for a pump rebuild.
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30+ A-Cs ranging from a 1928 20-35, to a 1984 8070FWA, Gleaner R52
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Posted By: Clay
Date Posted: 10 Nov 2011 at 8:46am
Buy yourself pump rebuild kit. It contains the gaskets you will need to rebuild your pump. Also replace the pilot tube. The pilot tube is held in by epoxy. After the pump is removed, heat the pilot tube with a heat gun and pull the pilot tube out. Clean the area thoroughly. Apply epoxy to the exterior grooves of the pilot tube and re-install into the bore. (NOTE: Measure the pilot tube stick out before removing.)
While you have the pump apart, replace the flex ring.
There is an alternative to the flex ring. Your parts supplier will have a replacement to the flex ring which does not go bad.
Get a copy or borrow a copy of the pump rebuild manual before you remove or rebuild any portion of the pump. Follow the instructions and you should do just fine. Be sure to not the position of ALL parts as you disassemble the pump.
Good luck.
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Posted By: injpumpEd
Date Posted: 10 Nov 2011 at 10:12am
flex ring being broken plugging return is probably what caused the cup seal to start leaking. time for pump service.
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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: tomwestky
Date Posted: 12 Nov 2011 at 5:18pm
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Thanks for all the counsel! I believe I now know where to start. The pump was just redone so the problem has to be in the re-installation. Tom
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Posted By: injpumpEd
Date Posted: 12 Nov 2011 at 8:35pm
If pump was just rebuilt, then the fuel side cup seal got rolled upon installation,(very common)lot of times when run with a rolled seal, the pilot tube gets ruined. or epoxy didn't hold and pilot tube spun.
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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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