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Thread: High oil pressure - 3126 engine

  1. #1
    Senior Member Tennesseahawk's Avatar
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    High oil pressure - 3126 engine

    Getting high oil pressure. Mechanic said it could be an oil pump, or just a sensor. He also mentioned another part I forget, that shouldn't go out til around 750k (I have 526 on mine).

    Any ideas?
    Freedom is free of the need to be free. - Free your mind and your *** will follow.

    When some wild-eyed, eight-foot-tall maniac grabs your neck, taps the back of your favorite head up against the barroom wall, looks you crooked in the eye and asks you if ya paid your dues, you just stare that big sucker right back in the eye, and you remember what ol' Jack Burton always says at a time like that: "Have ya paid your dues, Jack?" "Yessir, the check is in the mail."Jack Burton



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  4. #2
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    Get ur oil sampl3d, it migh5 be contaminated, likely its a sensor, though

    Sent from my GT-P3113 using EO Forums
    purgoose10 likes this.

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  6. #3
    Senior Member Tennesseahawk's Avatar
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    Re: High oil pressure - 3126 engine

    Quote Originally Posted by EASYTRADER View Post
    Get ur oil sampl3d, it migh5 be contaminated, likely its a sensor, though

    Sent from my GT-P3113 using EO Forums
    Just got an oil change yesterday. He said dirty oil would've done the pump. I didn't think 12k was too long for an oil change. I guess it is.
    Freedom is free of the need to be free. - Free your mind and your *** will follow.

    When some wild-eyed, eight-foot-tall maniac grabs your neck, taps the back of your favorite head up against the barroom wall, looks you crooked in the eye and asks you if ya paid your dues, you just stare that big sucker right back in the eye, and you remember what ol' Jack Burton always says at a time like that: "Have ya paid your dues, Jack?" "Yessir, the check is in the mail."Jack Burton



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  8. #4
    Senior Member zorry's Avatar
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    Years ago a driver called in NO OIL PRESSURE.
    Father said,probably a guage or sending unit.
    It was an oll pump. Lost the engine.
    Expensive lesson.
    Most likely a sensor, but if oil pump is failing,you want it checked NOW.
    Tomorrow may be too late.
    Tennesseahawk and purgoose10 like this.
    OOIDA # 463 ( Yeah, an old fart ). Expediting....It beats working for a living

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    Re: High oil pressure - 3126 engine

    Oil pump on a Cat is an easy fix. If you don't mind getting your hands dirty. I would change the sensor and then check the pressure before you go out on a load. It will tell you right away.

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  12. #6
    Senior Member Tennesseahawk's Avatar
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    Re: High oil pressure - 3126 engine

    Quote Originally Posted by zorry View Post
    Years ago a driver called in NO OIL PRESSURE.
    Father said,probably a guage or sending unit.
    It was an oll pump. Lost the engine.
    Expensive lesson.
    Most likely a sensor, but if oil pump is failing,you want it checked NOW.
    Tomorrow may be too late.
    Thank you for that! Initially, I was going to run it until I got it checked out. The pressure hovered between 75 and 85, so I thought it would be ok. The more I thought about it tho, I didn't want to risk the truck on a hunch. You've confirmed my fears.
    Freedom is free of the need to be free. - Free your mind and your *** will follow.

    When some wild-eyed, eight-foot-tall maniac grabs your neck, taps the back of your favorite head up against the barroom wall, looks you crooked in the eye and asks you if ya paid your dues, you just stare that big sucker right back in the eye, and you remember what ol' Jack Burton always says at a time like that: "Have ya paid your dues, Jack?" "Yessir, the check is in the mail."Jack Burton



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  14. #7
    Senior Member zorry's Avatar
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    Oil change yesterday. Did you get the wrong filters ? 50w oil ?
    Unless problem started before the oil change.....
    Last edited by zorry; 08-16-2012 at 02:59 PM.
    OOIDA # 463 ( Yeah, an old fart ). Expediting....It beats working for a living

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  16. #8
    Senior Member Tennesseahawk's Avatar
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    Re: High oil pressure - 3126 engine

    Quote Originally Posted by zorry View Post
    Oil change yesterday. Did you get the wrong filters ? 50w oil ?
    Unless problem started before the oil change.....
    It started the day before I got the oil change. Then afterwards, the pressure started out a little high, dropped to normal (50) for about a half hour, then jumped up around 75. The day before I got the oil changed, it shot up around 100 at high idle, for a few seconds. Then it was at 75-85 most of the day, then it dropped to normal for a short time before returning to 85. One thing that I found weird was it dropped back to normal after running the A/C on high.
    Freedom is free of the need to be free. - Free your mind and your *** will follow.

    When some wild-eyed, eight-foot-tall maniac grabs your neck, taps the back of your favorite head up against the barroom wall, looks you crooked in the eye and asks you if ya paid your dues, you just stare that big sucker right back in the eye, and you remember what ol' Jack Burton always says at a time like that: "Have ya paid your dues, Jack?" "Yessir, the check is in the mail."Jack Burton



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  18. #9
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    Re: High oil pressure - 3126 engine

    Ok, if you are pushing that much pressure & it's not a sensor issue than you may experiance gaskets leaking, particually around the oil cooler under the turbo.

    How is it running? I know you said it started the day before. Are you sure the shop did not overfill the motor? The truck stop i used once over filled my motor by a gallon. The truck did not run right, it was drowning in oil, but I had normal to slightly lower than normal oil pressure but no power what's so ever, especialy on hills.

    I've never dealt with an oil pump issue ever. Is the CAT oil pump electrical or mechanical? I assume it's located in the oil sump/pan.

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    Re: High oil pressure - 3126 engine

    you could have a sticking pressure relief valve on the oil pump, that is a cup like piston and a spring designed to pop off when the oil pressure becomes too high. When they stick, you can blow oil filters off and result in catastrophic engine failure due to lack of lube. Because you had the problem before the oil change, you can rule out oil filters. Another thing that can cause high oil pressure is cam bearings turning in their bore. Diagnostically, check the easy things first, like a manual oil pressure gauge to check against the on in the dash.

    Best of luck,

    Scott
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  22. #11
    Senior Member Tennesseahawk's Avatar
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    Re: High oil pressure - 3126 engine

    Quote Originally Posted by Mdbtyhtr View Post
    you could have a sticking pressure relief valve on the oil pump, that is a cup like piston and a spring designed to pop off when the oil pressure becomes too high. When they stick, you can blow oil filters off and result in catastrophic engine failure due to lack of lube. Because you had the problem before the oil change, you can rule out oil filters. Another thing that can cause high oil pressure is cam bearings turning in their bore. Diagnostically, check the easy things first, like a manual oil pressure gauge to check against the on in the dash.

    Best of luck,

    Scott
    That's what they're doing. I'm hoping it's the sensor, since the pump installed is over $900.

    Thanks for your answer.
    Freedom is free of the need to be free. - Free your mind and your *** will follow.

    When some wild-eyed, eight-foot-tall maniac grabs your neck, taps the back of your favorite head up against the barroom wall, looks you crooked in the eye and asks you if ya paid your dues, you just stare that big sucker right back in the eye, and you remember what ol' Jack Burton always says at a time like that: "Have ya paid your dues, Jack?" "Yessir, the check is in the mail."Jack Burton



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  24. #12
    Senior Member Tennesseahawk's Avatar
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    Re: High oil pressure - 3126 engine

    They're thinking it's the sensor or a wiring problem. They're hooking up a mechanical gauge right now. I'll take it out for a test drive this weekend, and should be good to go.

    Thanx for everyone's' help.
    Freedom is free of the need to be free. - Free your mind and your *** will follow.

    When some wild-eyed, eight-foot-tall maniac grabs your neck, taps the back of your favorite head up against the barroom wall, looks you crooked in the eye and asks you if ya paid your dues, you just stare that big sucker right back in the eye, and you remember what ol' Jack Burton always says at a time like that: "Have ya paid your dues, Jack?" "Yessir, the check is in the mail."Jack Burton



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  26. #13
    Senior Member Tennesseahawk's Avatar
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    Re: High oil pressure - 3126 engine

    High oil pressure problem fixed. Now I have low oil pressure. When driving, it's around 28. When it's idling, it's around 5 or less.

    Being that it was likely debris in the oil pump to cause the high oil pressure, would it take a rocket scientist to deduce that the oil pump may be on its last legs, and is causing the low oil pressure?
    Freedom is free of the need to be free. - Free your mind and your *** will follow.

    When some wild-eyed, eight-foot-tall maniac grabs your neck, taps the back of your favorite head up against the barroom wall, looks you crooked in the eye and asks you if ya paid your dues, you just stare that big sucker right back in the eye, and you remember what ol' Jack Burton always says at a time like that: "Have ya paid your dues, Jack?" "Yessir, the check is in the mail."Jack Burton



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  28. #14
    Senior Member Tennesseahawk's Avatar
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    Re: High oil pressure - 3126 engine

    Also, when the shop changed the oil, they put too much in it... maybe 2qt to a gal. Could this cause low oil pressure?
    Freedom is free of the need to be free. - Free your mind and your *** will follow.

    When some wild-eyed, eight-foot-tall maniac grabs your neck, taps the back of your favorite head up against the barroom wall, looks you crooked in the eye and asks you if ya paid your dues, you just stare that big sucker right back in the eye, and you remember what ol' Jack Burton always says at a time like that: "Have ya paid your dues, Jack?" "Yessir, the check is in the mail."Jack Burton



  29. 14,560727,55078,8
  30. #15
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    Re: High oil pressure - 3126 engine

    To much in a Cat can lower the pressure. 28 sounds about normal for idling and low RPMS, should run about 40 psi normal operation. 5 is way to low, check your guage.

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