6140 oil pressure problem
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=54997
Printed Date: 10 Sep 2025 at 7:50am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 6140 oil pressure problem
Posted By: Morgan in AR
Subject: 6140 oil pressure problem
Date Posted: 09 Aug 2012 at 3:19pm
My 6140 does not pick up oil pressure immediately upon start up. Sometimes it takes up to a minute or so. After it picks up oil, it does fine with fair oil pressure. It has done this off and on for several years now, but it seems to be getting slightly worse. If it has sat for more than a couple of hours it happens pretty much every time. It used to get better with new oil filter but I can't tell any difference any more. I have looked at the parts diagrams, and I can't see any type of check valve. Do you all think that the oil pump needs to be replaced (if it's even available)? Any other thoughts? thanks- Morgan
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If we loose freedom here there is no place left to escape to. This is the last stand on earth. -Ronald Reagan
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Replies:
Posted By: Stan IL&TN
Date Posted: 09 Aug 2012 at 7:20pm
If the oil pickup in the oil pan has a screen over it then I would start there and make sure it's clean.
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1957 WD45 dad's first AC
1968 one-seventy
1956 F40 Ferguson
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Posted By: Morgan in AR
Date Posted: 10 Aug 2012 at 6:41am
Thanks. there is a screen. It looks like I have to remove loader, front end, front cover, engine , clutch and flywheel to remove oil sump. This project may have to wait for cooler weather.
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If we loose freedom here there is no place left to escape to. This is the last stand on earth. -Ronald Reagan
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