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  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » Replaced my oil presure sending unit and..........

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    1/10/2020 8:19 PM  #1

    6sally6
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    From: Surfside Beach,SC
    Registered: 4/02/2013
    Posts: 6,460

    Replaced my oil presure sending unit and..........

    Although it's what the "parts counter guru" said the computer called for.........and it looks like the old one that went bad.....the hole in the bottom of it is smaller than the old one! Now, when I run the engine my oil pressure is all the way over to the H mark! (I got oil pressure like a 'Shivel-ley motor')
    Reckon having the needle pegged will hurt any thing----should I go get another one---should I try to drill out the hole some-----should I adjust my little home made CVU hickey that supplies the correct current to my gauges----leave it be???
    Not sure which is the best path.
    6sal6

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
     

    1/10/2020 8:29 PM  #2

    josh-kebob
    Senior 24-7 FYI Addict

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    From: Madison, AL
    Registered: 4/06/2013
    Posts: 2,902

    Re: Replaced my oil presure sending unit and..........

    What was wrong with the old sending unit

     

    1/10/2020 9:29 PM  #3

    6sally6
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    From: Surfside Beach,SC
    Registered: 4/02/2013
    Posts: 6,460

    Re: Replaced my oil presure sending unit and..........

    It just quit!  Gauge works (I checked that)
    Just crunk-it-up (Alabama talk! (8  ) one day and the gauge just set there.
    Afterward..........I thought about trying to flush out the old one to see what happens!?
    6sal6

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
       •Thread Starter
     

    1/10/2020 9:52 PM  #4

    Texas!
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    Registered: 6/27/2014
    Posts: 216

    Re: Replaced my oil presure sending unit and..........

    Did you buy some cheap aftermarket chinese replacement or Motorcraft?

     

    1/11/2020 5:36 AM  #5

    gjz30075
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    Registered: 4/03/2013
    Posts: 184

    Re: Replaced my oil presure sending unit and..........

    If your other gauges haven't changed, then it's not your cvr.   

     

    1/11/2020 8:04 AM  #6

    Rudi
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    From: Stuck in the 50's Welland Ca
    Registered: 4/01/2013
    Posts: 3,782

    Re: Replaced my oil presure sending unit and..........

    I,da thought you’d have a real oil pressure gauge with numbers on it Mike! 

    Good work ain't cheap, Cheap work ain't good!   Simple Man
     

    1/11/2020 6:34 PM  #7

    6sally6
    Hyper FYIFORD ADDICT

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    From: Surfside Beach,SC
    Registered: 4/02/2013
    Posts: 6,460

    Re: Replaced my oil presure sending unit and..........

    Texas! wrote:

    Did you buy some cheap aftermarket chinese replacement or Motorcraft?

    Advance Auto parts finest......  The old one was NOT FoMoCo so........

    Since the gauge just reads H  or  L....(instead of actual pressure numbers) I guess it just tells me "I-got-some-oil-pressure"  vs how much. May be all I can hope for.
    6s6
     

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
       •Thread Starter
     

    1/12/2020 12:33 AM  #8

    cman66
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    From: Ponchatoula, LA
    Registered: 1/06/2018
    Posts: 179

    Re: Replaced my oil presure sending unit and..........

    Is it possibly a sending unit for a light and not a gauge
    Cman66

     

    1/12/2020 7:29 AM  #9

    MS
    Forum Originator

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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 11,729

    Re: Replaced my oil presure sending unit and..........

    If it pegs the gauge, it is wrong one or defective. It will harm the gauge. Size of the hole should not matter.   Be sure the sender wire is not grounding to the case of the sender.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    1/12/2020 11:13 AM  #10

    Texas!
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    Registered: 6/27/2014
    Posts: 216

    Re: Replaced my oil presure sending unit and..........

    The 3 Ford gauges (Oil Pressure, Water Temperature, Fuel Quantity) all work in the same resistance range of 10-73 ohms. 73 ohms is the bottom end of the scale (L,C, E) and 10 ohms is the high end of the scale (H, H, F). So you could actually use the Fuel gauge in place of your Oil Pressure gauge to verify the gauge is working properly.
    To test the new O.P. sending unit remove the wire from the center stud and place one probe of an Ohmmeter on the stud. Hold the other lead on the base of the sending unit. With the engine off you should see about 73 ohms resistance. Now start the engine and repeat the test. If you now read 10 ohms or less your sending unit is out of tolerance. Even with cold oil the gauge should not peg on H which equates to 10 ohms.

    Last edited by Texas! (1/12/2020 11:16 AM)

     

    1/12/2020 5:16 PM  #11

    6sally6
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    From: Surfside Beach,SC
    Registered: 4/02/2013
    Posts: 6,460

    Re: Replaced my oil presure sending unit and..........

    Well.........upon closer examination yesterday..........the needle ain't pegged.
    It is on the better side of mid way butt-knot hard up again the stobb on the guage
    6s6

    Get busy Liv'in or get busy Die'n....Host of the 2020 Bash at the Beach/The only Bash that got cancelled  )8
       •Thread Starter
     

    1/13/2020 11:06 PM  #12

    Nos681
    Senior 24-7 FYI Addict

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    From: Atlantic Mine, Michigan
    Registered: 7/14/2016
    Posts: 3,057

    Re: Replaced my oil presure sending unit and..........

    Measure resistance from sender to ground.

    What do ya get?

    While running?
    While off?


    What was the part number?

    Last edited by Nos681 (1/13/2020 11:09 PM)

     

     

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