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  1. #1

    Default New Member S/W Ontario Canada, With Questions??

    Just got a 1998 Chev 3500 Cheyenne 1 ton with a 350 engine. Motor was replaced about 5 years ago with a brand new crate motor from GM. Original motor failed due to leaking intake manifold gasket. The present motor also has the same problem-antifreeze in the crankcase, also attributed to leaking intake manifold gasket. What years did this problem start and when did it end? The local rebuilder advises me that this was a common problem. Does anyone know if this a machining error or poor gasket on the part of GM? Apparently there is a replacement gasket that solves this mess. I don't have the motor out yet and will have to wait for the climate to warm up before I pull the engine. Cheers, Old Iron nut.
    PS. Truck has low mileage.

  2. #2

    Default

    *****Thread Moved*****
    To The
    General Chevy/G.M. Tech Section


    MIKE


    99"SILVERADO
    5.3 l 3.73 l G80
    BLACK BEAR CUSTOM TUNE
    SNUGTOP l COLORMATCH l KATZKIN










  3. #3

    Default

    You should be able to fix it without pulling the engine. I had the same problem on a 4.3 and fixed it by removing the intake while still in the truck.

    Do a google search on Dexcool antifreeze and leaking intakes, that should answer all questions.
    Ray

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  4. #4

    Default

    Oh yeah. Ray's got the right of it. As soon as I read the magic "5 years" mark, I instantly thought Dexcool.

    That stuff needs to replaced every 2 years on the spot. The additive package just isn't sufficient to protect your engine's aluminum parts. Great for cooling, but nasty on gaskets!
    2006 Vortec Max 1500
    Performance:
    -Custom Tune (389HP 440 Ft/lbs Trq - Dyno'd) | Volant CAI | Magnaflow Dual-in/out Exhaust w/3" stainless pipe tips | Fully Built Transmission w/ Red Eagle Clutches & Kolene Steels w/ Corvette Servos and Stage2 Shift Kit | 35K Tranny Cooler | Mobil 1 | Royal Purple Rear Diff
    Other:
    -Spray-in Bed Liner
    -Premium Sound w/lifetime Satellite Radio | Leather | Sunroof | Heated Seats
    -Limbstriping from USING the truck (those are badges of honor)

  5. #5

    Default

    Skippy. don't know whether or not the engine had Dexcool or not, the problem started about 2-3 years after the new motor was installed. The truck has not been plated for the last 2 years. I don't know if Dexcool is the same as the Cat long life antifreeze but I know the Cat stuff does not have to be changed every two years. There are a few other GM owners with the same problem of leaking intake manifolds. Cheers, Old Iron nut.

  6. #6

    Default

    Quote Originally Posted by Old Iron nut View Post
    Skippy. don't know whether or not the engine had Dexcool or not, the problem started about 2-3 years after the new motor was installed. The truck has not been plated for the last 2 years. I don't know if Dexcool is the same as the Cat long life antifreeze but I know the Cat stuff does not have to be changed every two years. There are a few other GM owners with the same problem of leaking intake manifolds. Cheers, Old Iron nut.

    http://www.consumeraffairs.com/news0...m_dexcool.html

    Dexcool, btw was supposed to last 5 years or 150K miles. Any dexclone antifreeze is likely to have the same corrosive properties. Can I guarantee the intake manifold leak is a direct result of the antifreeze by evaluating a forum post? Absolutely not! LOL

    That being said, I'd still take a peak at what the formulation was. And if it's a Dexcool clone, I'd still be changing the stuff every 2 years... It's just not worth a bum engine. Too much evidence that shows Dexcool formulation DOES last 5 years, but the engine in which it's operating DOESN'T. *grin*

    -Skippy

  7. #7

    Default

    Many thanks for the reply, Skippy. I have been using the long life Cat antifreeze and Mobil 1 synthetic oil in all my equipment and have not had any problems. I'm hoping to remedy the problems in the 98 Chevy after I tear it down and correct same. Funny, I don't have leaking intakes on my old Cats. Only been working on them for over 40 years. Cheers, Old Iron nut.

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