Duramax help
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Duramax help

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    Senior Member steveo143's Avatar
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    Default Duramax help

    2004 GMC duramax. Loosing coolant but can't find any leaks and runs @ 194* all day long. Where is the coolant going, head gasket?
    steveo143 AKA DiMarco 21 II



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    Senior Member EVILFORCE's Avatar
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    My guess if you can find no leaks is the injector sleeve. Does it have a little smoke?
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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by EVILFORCE View Post
    My guess if you can find no leaks is the injector sleeve. Does it have a little smoke?
    yep, if someone has done the injectors on it, more than likely they over torqued the injector hold down bolt and warped the sleeve. i see it all the time around here he'll build coolant system pressure fast too if a sleeve is leaking, kinda like a headgasket will.

    the water pump will leak and be hard to see as well, you'll have to pull off that plastic shield under the frt end and look for signs of coolant leak on the lh side of the motor. if its leaking at the pump , take it to the dealer, you have to hold the flywheel to break the harmonic balancer bolt loose just to get the pump off its a biatch, and they're tighttttttttt! i've got a 6ft cheater i use to break em loose

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    Quote Originally Posted by IMPATIENT 1 View Post
    yep, if someone has done the injectors on it, more than likely they over torqued the injector hold down bolt and warped the sleeve. i see it all the time around here he'll build coolant system pressure fast too if a sleeve is leaking, kinda like a headgasket will.

    the water pump will leak and be hard to see as well, you'll have to pull off that plastic shield under the frt end and look for signs of coolant leak on the lh side of the motor. if its leaking at the pump , take it to the dealer, you have to hold the flywheel to break the harmonic balancer bolt loose just to get the pump off its a biatch, and they're tighttttttttt! i've got a 6ft cheater i use to break em loose
    X2, Couldn't have said it better.

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    Is is a LB7 or LLY?

    Most likely it's going to be the head gasket if you have a LLY. The water pump is a good possibillity also and if you are under 100000 miles it should be covered under the powertrain warranty. Water pumps usually are not covered, but since the duramax water pump is internally lubed with engine oil it gets covered. I was suprised when mine got covered.

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    Senior Member steveo143's Avatar
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    Thanks for all the tips. My son has the truck for a couple of days but will check all the possibilities Friday. Don't think the injectors have been done. Bought the truck from Tony Scarlata with 38,000 mi. Has about 65,000 on it now. Edge chip. Smokes if I nail it from a standstill.
    steveo143 AKA DiMarco 21 II



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    "if u aint first yur last havasucat24's Avatar
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    if u take it to the dealer remove the edge they wont cover it if the see the edge box they will blame it on the edge box ,happened to me good luck

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    Quote Originally Posted by havasucat24 View Post
    if u take it to the dealer remove the edge they wont cover it if the see the edge box they will blame it on the edge box ,happened to me good luck
    won't matter, we can tell if its had 1 installed and removed current gm software detects and logs aftermarket programmers, you put 1 on and the motor pops, you're on your own

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    if you can get access to a coolant system pressure tester, pump up the coolant system, remove all the glow plugs, and let it sit for an hr or too with pressure on the cooling system. have someone looking on both sides of the motor and bump the starter a couple of times. whatever cylinder has the leaking sleeve should shoot out alil coolant from the glow plug hole that'd be the injector sleeve to replace(and hope to god the head isn't hurt!)

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    Senior Member steveo143's Avatar
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    How do you tell which engine LB7 or LLY?
    steveo143 AKA DiMarco 21 II



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    Quote Originally Posted by steveo143 View Post
    How do you tell which engine LB7 or LLY?
    go look at the 8th digit of the vin and let me know what it is there also should be a spid lable in your glove box with rpo codes and somewhere on it , it should say.

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    Quote Originally Posted by IMPATIENT 1 View Post
    go look at the 8th digit of the vin and let me know what it is there also should be a spid lable in your glove box with rpo codes and somewhere on it , it should say.
    Or the sticker on the radiator cover. Should say the engine code.
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    Quote Originally Posted by IMPATIENT 1 View Post
    won't matter, we can tell if its had 1 installed and removed current gm software detects and logs aftermarket programmers, you put 1 on and the motor pops, you're on your own

    They have to prove the programmer was the issue before they void it.


    There a ton of dealers out there that will work with you. Shit most of them need the work anyhow.

  16. #14
    Senior Member steveo143's Avatar
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    Well it is a LB7 motor.
    steveo143 AKA DiMarco 21 II



    Now totally Green on E-85, saving the world one ear of corn at a time!
    RIP Davey B and Denis and Chris and Bob GN7

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