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1997 Chevrolet Tahoe Question: Coolant in Oil Issue

 

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seedless1924, 5.7L V8, Norton, MA, February 05, 2011, 08:09
 Rookie

I have coolant leaking into my oil(engine), so it's head gasket or i was told its an air intake valve that goes through the throttle-body or a crack in the block...Drained oil, coolant and replaced until I can figure out more, I have great compression.

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  • Answer #1

    February 05, 2011, 12:54
     Master

    Unless there's a cracked block or head, the coolant typically comes from a head gasket leak or an intake manifold gasket leak. It's not easy to crack the block or the heads, so I'd suspect a bad head gasket or intake manifold gasket problem. If the intake has never been resealed, it's a very likely source of coolant in the oil. The head gaskets usually don't fail unless the engine's been overheated. You didn't mention any overheating...
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    seedless1924, February 05, 2011, 14:02
     Rookie

    The tahoe got hot for its first time when this happened,.. made it home, going slow , obviously bc i had like 10quarts of liquid in my motor, to much pressure.. it stalled n my driveway, but never overheated, to my knowledge.. there was not steam, nor fluids leaking.. i drained it immediately.. and then cranked it over. started right up, came to an idle.. and i shut it off, and repeated it and left it.. i'm a body man, i know little about mechanics, but i dont have enough experience to know symptoms to diagnose it.. so like you said I dont think its the block, but the head gasket or manifold gasket, could be my issue, thats what i was looking to hear.. your knowledge is very appreciated... Do a pressure check on the block, if its all good, take the manifold and heads off and reseal everything w/ new gaskets etc.. have the heads manga fluxed?

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