Duramax 6.6 oil pressure?

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  1. #1
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    Duramax 6.6 oil pressure?

    I have a 2003 Chev duramax 6.6 and the computer has been saying low oil pressure at times and guage reading low too. Just over 300,000 kms on it. Thought I'd attach a mechanical pressure guage to block. Anyone know of a spot to attach it? Heard somewhere near oil filter...
    Giver!

    81 Jimmy f/s
    305 darn it, 454 one day....
    TH350 Tranny, NP208 T-case
    4" susp. lift
    38"x13" TSL Super Swampers on 16" White Steel Spoked
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    Dana 60 front, 4:10's
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  3. #2
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    New Westminster
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    Re: Duramax 6.6 oil pressure?

    I would attach a mechanical gauge in place of the oil press switch. Run it to the windshield and road test.

  4. #3
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    Re: Duramax 6.6 oil pressure?

    Any idea where oil switch you talk about on engine? I'm thinking up by oil filter...
    Giver!

    81 Jimmy f/s
    305 darn it, 454 one day....
    TH350 Tranny, NP208 T-case
    4" susp. lift
    38"x13" TSL Super Swampers on 16" White Steel Spoked
    14 bolt rear with Detroit Locker, 4:10's
    Dana 60 front, 4:10's
    Full-cage & 5 pt. harness in progress
    Custom bumpers
    8000 lb warn, front & rear receivers
    CB, CD Player

    Cariboo4x4.ca

  5. #4
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    Jun 2007
    Location
    Quesnel bc
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    344

    Re: Duramax 6.6 oil pressure?

    ive heard the lb7s sometimes have low oil pressure.. thing is what you gonna do to fix it??
    rip matt 11/04/10

  6. #5
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    Oct 2004
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    Canim Lake
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    306

    Re: Duramax 6.6 oil pressure?

    Ok low oil pressure due to diesel leaking from return lines under valve cover. $700 repair bill fixed it. Cheaper than new injectors. Had it fixed in July and truck oil pressure back to normal since!!
    Giver!

    81 Jimmy f/s
    305 darn it, 454 one day....
    TH350 Tranny, NP208 T-case
    4" susp. lift
    38"x13" TSL Super Swampers on 16" White Steel Spoked
    14 bolt rear with Detroit Locker, 4:10's
    Dana 60 front, 4:10's
    Full-cage & 5 pt. harness in progress
    Custom bumpers
    8000 lb warn, front & rear receivers
    CB, CD Player

    Cariboo4x4.ca

  7. #6
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    May 2005
    Location
    Kelowna
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    1,924

    Re: Duramax 6.6 oil pressure?

    My 03 has low pressure, hovers just above the red part on the factory gauge at idle but when your driving or giving it throttle it jumps up to normal. Im probably going to hook up a better gauge on mine to watch it more closely.

    Your return lines were leaking into the oil thus thinning it out and cause low oil pressure? I had leaky injectors in mine and had about 2 liters of diesel in my oil before I got the injectors done and my oil pressure gauge still seem the same was it is now without them leaking. Don't really trust the factory gauge myself tho
    I am a Toyota Whore

  8. #7
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    Join Date
    Oct 2000
    Location
    Surrey BC Canada
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    65

    Re: Duramax 6.6 oil pressure?

    Totally normal for pressure to increase with rpm.

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