Help: Oil Pressure Problem

Discussion in 'Flat Fender Tech' started by oldie, Oct 25, 2015.

  1. Oct 25, 2015
    oldie

    oldie New Member

    Austin, Tx
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    Our '48 ranch jeep with the 225 suddenly started blowing oil around the oil filter gasket yesterday. I've never even heard of anything like this. What could be the cause?
    We drove it several hours two weeks ago and had no problem what so ever. It happens so fast that the pressure gauge doesn't have time to show the pressure. I won't be able to get back to the ranch for a few days so it will take me some time to investigate any suggestions you might have. Forgot to mention that we changed the filter and made sure the surface where the gasket met the block was clean but it that had been the problem it would have show up before.
     
    Last edited: Oct 25, 2015
  2. Oct 25, 2015
    47v6

    47v6 junk wrecker! Sponsor

    Washington DC.
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    clogged filter or pressure release valve stuck?
     
  3. Oct 25, 2015
    SFaulken

    SFaulken Member

    Renton, WA
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    Offhand, you didn't end up with the old gasket stuck to the housing the last time you changed the oil did you? That *can* seal up, initially, and then develop a leak later. Seen it plenty of times.
     
  4. Oct 25, 2015
    oldie

    oldie New Member

    Austin, Tx
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    No, we checked for that when we tried a new filter. It probably does have something to do with the pressure relief valve but have never seen that before. If it is the valve, what is the best way to get it out?
     
  5. Oct 25, 2015
    uncamonkey

    uncamonkey Member

    Greeley CO
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    I thought I replied to this once and yes the seal on the filter is an issue as is the preassure relief valve. Cut a small grove along the side so the oil trapped behind can escape. I don't think my parents appreaciated some of the oil I left on the driveway.
     
  6. Oct 25, 2015
    Warloch

    Warloch Did you say Flattie??? Staff Member Sponsor

    Falcon, CO
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    Another item - check your PCV and make sure its not clogged. Normally blows pressure in other places (top end), but have seen it blow by at the filter.
     
  7. Oct 25, 2015
    oldie

    oldie New Member

    Austin, Tx
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    Did check this but it didn't help the situation.

    uncamonkey... I'm not understanding what you mean...
    Could you explain further?
     
  8. Oct 26, 2015
    uncamonkey

    uncamonkey Member

    Greeley CO
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    I didn't think it was right either when the old Jeep guy told me about it. I could blow the filter off or blow the rubber seal out when I started the 198 V6 on cold mornings. Oil gets trapped behind the relief plunger and won't allow it to move back against the spring and regulate pressure. Two options, drill a small hole in the piston or put a small groove along the side so the trapped oil could escape.
    I went through a couple of 198s and have a couple of 225s and it was just that one motor that would do that. Both versions of V6s use the same timing chain cover and oil pump.
    One of things I would do in the morning was to start the motor just long enough to start to get some OP up then shut it off. Repeat as needed. The groove fixed everything.
    I bent the innards of the OP guage up fairly well by putting too much pressure to it, so what is your guage reading when things are leaking?
    Enough of an explanation?
    As others have said, be sure your relief plunger is actually doing as it should. Remove the big nut on the side of the oil pump and a spring will be in there, then the plunger or relief piston, which ever term you want to use. Be sure it moves in a free manner.
    You didn't do something like change the oil filter or anything? I did that once on my Volvo and the supposed replacement leaked badly.
    Thats about all I have here.
     
    Last edited: Oct 26, 2015
  9. Oct 26, 2015
    oldie

    oldie New Member

    Austin, Tx
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    Thanks uncamonkey, I understand.
     
  10. Oct 26, 2015
    PeteL

    PeteL Member Sponsor

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    "As others have said, be sure your relief plunger is actually doing as it should. Remove the big nut on the side of the oil pump and a spring will be in there, then the plunger or relief piston, which ever term you want to use. Be sure it moves in a free manner."

    Yes. I once installed a NOS military surplus oil pump. Still in the original packaging.

    Blew the filter right off the engine in about two seconds. Relief valve was stuck.
     

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