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  1. #1
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    Default New Member with water getting into 5.7 engine - need your ideas

    Hi GMTruck members,

    I frequent a few other tech forums for cars, cycles and tractors. Forums can be a great resource. This time I'm fixing a '97 Vortec 350 so here I am at GMTruck. I have 3 vortecs, '96 Safari 4.3, '97 Silverado 5.7 (put new Fel-Pro intake gaskets on both) and now I have a '97 Suburban 5.7 that I bought with a disclosed defect - it loses coolant. The oil is clean - not milky, so I'm assuming it's going into the cylinders and out the exhaust. I'd appreciate knowing where this subject area has been on this forum, or any ideas/experience anyone has on this. Thanks, Arby

  2. #2
    Sr. Mechanic trapperdon's Avatar
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    Default

    have you actually tested / seen coolant coming out of the exhaust?
    what about running it till its hot and getting on gloves and twisting all the hoses just a little bit to
    see if you have an undiscovered pin hole that only leaks hot under pressure??
    place an old white t-shirt against your tail pipe opening and have someone blip the throttle a few times...
    you'll get some kind of discharge that stains itself to it, you'll be able to tell just what is coming out
    by the look & wetness and smell of it...
    :fighting0037:
    when in doubt, doubletap !

    - buying a new truck, one part at a time :grrrrrr:
    94 Blazer 4x4 k1500 5.7 L - aftermarket cold air intake
    Energy Suspension swaybar & upper and lower control arm bushings
    Pro Comp ES 9000 front shocks, new front drive axles,
    stainless front brake rotors & new pads,
    new Moog front end ball joints, Smittybilt black nerf bar steps,
    MB Racing rims & Hankook ATm off road tires

  3. #3
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    murdog94's Avatar
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    Default

    Welcome aboard...
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  4. #4
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    Default

    Quote Originally Posted by trapperdon View Post
    have you actually tested / seen coolant coming out of the exhaust?
    ...................
    No, but it's a good idea...

    This whole thing is somewhat bizarre. I haven't actually run it. The seller had someone looking at it before me and said they were adding water while it was running. He said they added a lot - the guy insisted he was knowledgeable and it was ok. It eventually put up a smoke cloud and then just quit - with no noises. The starter then would just clunk and not turn the engine.

    Despite this condition, I bought it anyway (stunningly rust-free '97 Suburban for cheap) and trailered it home.

    With the plugs removed, approx one pint of unmixed oil and water drained out of the plug holes. On the lift, we drained about 3 gallons of water, followed by a gallon of oil, all from the pan plug. Both fluids were relatively clean, with no milky crap indicating they had been in there long enough to mix. It's as though someone had added water through the oil filler in the valve cover, floating the oil up to where the pcv valve allowed it to go into the throttle body. Either that or there is some kind of very large internal leak somewhere. BTW the engine now spins freely with no noises - so there's a chance it isn't yet fatally injured. Any ideas?
    Last edited by arby; 06-21-2010 at 12:33 PM.

  5. #5
    Sr. Mechanic trapperdon's Avatar
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    reguardless of HOW it happened, you are going to end up with a rusted crank / internals unless you can get
    all the water out. have you refilled the pan with oil & the radiator with coolant and tried it again?
    then pull the plugs to see if the same thing happens...
    if so, your block is screwed and gonna be a money pit to fix...

  6. #6
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    Quote Originally Posted by trapperdon View Post
    reguardless of HOW it happened, you are going to end up with a rusted crank / internals unless you can get
    all the water out. have you refilled the pan with oil & the radiator with coolant and tried it again?
    then pull the plugs to see if the same thing happens...
    if so, your block is screwed and gonna be a money pit to fix...
    Thanks - maybe I'll pressure test the cooling system for gross leaks, and a compression test. Then I'll know if I should just look for another engine.
    Last edited by arby; 06-21-2010 at 12:31 PM.

  7. #7
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    Default

    Thanks for the welcome - I tried pressurizing the radiator today and water could be heard running into the engine up at head level on passenger side - soon it ran out the open oil pan drain. I'll take off the intake and inspect for a gasket gap. I'm assuming this saga should be continued on the tech forum? I ran into another PITA - the plug where the engine harness connects to the heater/ac unit is potted in with some kind of very tenacious sealant (from hell). No sure the best solution isn't cutting and splicing the wiring - thanks a lot GM and UAW - great job, NOT!!

  8. #8
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    Eddie Z71's Avatar
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    Hi, and welcome to the site! Glad to have you here!
    Eddie , 2000 Chevy Tahoe Z71 (old style)

  9. #9

    Default

    Welcome to the GMTruckClub! Good idea to move to tech. section. Good luck!


    2010 Z/71 Colorado C/C
    Black 4X4 w/5.3L V8
    ===============
    2007 Winnebago Adventurer
    w/8.1L Chevy & Allison 6spd.
    Canyon Lake, Texas

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