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mikeyD 
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Joined: 29 Jul 2014
Location: Arlington,KS
Points: 60
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 Topic: OFF COLOR OIL PRESSURE
Posted: 19 Jan 2024 at 11:03am |
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I know some of you guys have Fords so I knew I could get help on this site. My 1954 NAA usually has between 40 and 60 psi on startup. Lately when it started the gauge only went to 20 then started down. I am thinking the pump needs replaced? Might it be anything else?
And what would it cost? Thanks for any help.
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ac45dave
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Joined: 23 May 2015
Location: SE(IN)
Points: 1337
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Posted: 19 Jan 2024 at 11:10am |
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Sounds more like a stuck pressure relief valve to me,especially if this came on kind of suddenly, or maybe a gauge issue not out of the question.
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54 wd-45gas ; 56 wd-45d N/F w/fact p/s ; 63 d-17 sIII N/F gas ; 60 D14 N/F ; 67 d-17 sIV N/F gas ; 63D15 sII W/F; 39rc#667 ; 2021 massey 4710 fwa ; gravely 2 wheel tractors
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Codger
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Joined: 23 Dec 2020
Location: Illinois
Points: 2050
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Posted: 19 Jan 2024 at 11:11am |
Pump cavity and gearset could be worn, connecting rod, main bearings could be gaining additional clearance through age, use, and wear, pressure relief spring could have lost some tension, etc.
Best start with another gauge to verify problem exists, then drop the pan and check the mains and rod bearings for clearances. If acceptable and within specifications, replace the pump. If replacing the pump not a bad idea to go with a high volume unit to provide addition oil flow through the worn engine. Not higher operating pressure, higher operating flow.
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A career built on repairing and improving engineering design deficiencies, shortcomings, and failures over 50 years now.
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mikeyD
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Joined: 29 Jul 2014
Location: Arlington,KS
Points: 60
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Posted: 19 Jan 2024 at 11:25am |
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Thanks. Will check pressure relief valve and replace gauge then go from there.
Appreciate your help.
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Codger
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Posted: 19 Jan 2024 at 11:41am |
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No worries and hope you got a warm place to work.
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A career built on repairing and improving engineering design deficiencies, shortcomings, and failures over 50 years now.
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mikeyD
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Joined: 29 Jul 2014
Location: Arlington,KS
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Posted: 19 Jan 2024 at 1:44pm |
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Will wait for 50 degree day. It is 10 right now.
Thanks.
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Lars(wi)
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Joined: 14 Sep 2009
Location: Permian Basin
Points: 7192
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Posted: 19 Jan 2024 at 7:05pm |
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Not familiar at all with Ford agriculture engines. But start with the easy stuff first, check the accuracy of the gauge, verify there is sufficient amount of oil in the engine, proper viscosity, etc.
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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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mikeyD
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Location: Arlington,KS
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Posted: 20 Jan 2024 at 9:16am |
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Thanks for the response.
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Fred in Pa
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Joined: 13 Sep 2009
Location: Hanover Pa.
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Posted: 20 Jan 2024 at 10:07am |
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relief valve is in pump ,do gauge first . When you drop pan make sure you check mains and rods ,this engine has no cam bearings
Edited by Fred in Pa - 20 Jan 2024 at 10:09am
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He who dies with the most toys is,
nonetheless ,still dead.
If all else fails ,Read all that is PRINTED.
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DiyDave
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Joined: 11 Sep 2009
Location: Gambrills, MD
Points: 51651
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Posted: 20 Jan 2024 at 4:59pm |
When you have the pan off, try this trick: Take a long thin punch and whack it on an anvil or other solid steel object, remember the tone of the ring it makes. Next, whack it against each bearing cap. If one or more makes a "thock" sound, take the cap off and look for a loose or spun bearing... 
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Source: Babylon Bee. Sponsored by BRAWNDO, its got what you need!
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mikeyD
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Posted: 22 Jan 2024 at 11:41am |
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Thanks Fred and Dave
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Lon(MN)
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Joined: 11 Sep 2009
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Posted: 23 Jan 2024 at 6:59am |
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I rebuilt a 172. The oil pump drive shaft twisted off. The distributor drove the oil pump. After a rebuild of the engine and with the distributor out I primed the pump with a drill.
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http://lonsallischalmers.com
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mikeyD
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Location: Arlington,KS
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Posted: 29 Jan 2024 at 11:28am |
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Thanks everyone for the responses. Changed the oil and seems to solve the problem....only had 230 hours since last change!!
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