F2 oil pressure
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=197333
Printed Date: 25 Sep 2024 at 3:27am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: F2 oil pressure
Posted By: SteveM C/IL
Subject: F2 oil pressure
Date Posted: 23 Sep 2023 at 9:11am
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Have a 78 F2 with 3500 hrs. Noticed oil pressure reading low. Has electric sending unit. What's the chance its the sender or connection to gage? Nothing lasts forever full of oil.
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Replies:
Posted By: Ray54
Date Posted: 23 Sep 2023 at 11:37am
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Put a good mechanical gauge on for a test run.That should give you clue, as to if it is really low or not.
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Posted By: Lars(wi)
Date Posted: 23 Sep 2023 at 12:35pm
Also check alternator output, if voltage output is barely 12v(or a tad below) it may throw off all electronic gauges.
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I tried to follow the science, but it was not there. I then followed the money, and that’s where I found the science.
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Posted By: SteveM C/IL
Date Posted: 23 Sep 2023 at 1:09pm
Viewing the mechanical gage will be tricky going through the field. The question was go these things go bad? Obviously I can guge it in the shop WOT and see but that wasn't the answer to the question.
Voltmeter say 13 plus....
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Posted By: MACK
Date Posted: 23 Sep 2023 at 8:42pm
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With a good gauge on it, get it warmed up good and check gauge at low idle. 10 PSI or lower, may have bowed gasket in pump. MACK
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Posted By: IBWD MIke
Date Posted: 24 Sep 2023 at 6:58am
Replaced the electric sending unit in my grain truck last fall. 78 C-70 Chevy. It was all over the place, now it runs about 50 psi hot. They had it hid really well, took me forever to find the silly thing! Those sending units can go bad.
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Posted By: AC7060IL
Date Posted: 24 Sep 2023 at 6:21pm
Before replacing anything, try checking F2’s cab fuse panel for excessive dust, poor fuse contact, poor fuse wire connection, or bad fuse???
Good luck.
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Posted By: SteveM C/IL
Date Posted: 25 Sep 2023 at 1:04pm
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Will try to get a good gage on it to confirm. I loosened, wiggled wire on sender retightened. Seems to run a little higher which is just under half but really drops off at idle. Good ole round 80 lb gage w/eighth in npt is hard to find theses days. Auto parts stores junk only attach with special fittings and a line. Guess I could put the sender on my pressure regulator and see how it reads.
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