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checking crank case preasure

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by muddin4fun, Mar 8, 2002.

  1. muddin4fun

    muddin4fun 3/4 ton status

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    how do you do that besides checking compression? I've got good compression and good power, so if i'm getting blow by it's not bad...but it'll pop a cheapo oil cap off and now I've got a breather and it'll leak around the gromet...so I'd like to check it out real good.
     
  2. Triaged

    Triaged 1/2 ton status

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    It sounds like your PVC (positive crankcase ventalation) is not working. You need to replace the PVC valve and make sure the hose going to it is not obstructed. You should have no pressure in the crankcase.
     
  3. greg83k5

    greg83k5 1/2 ton status

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    sticky PCV.

    on the bright side, if you run a snorkle, your positive crankcase pressure would insure no water ingress!!!!!

    ~my other engine had broken rings, and when it was nice and warm, it would chug hot smoky blast of air outta the oil-fill BUNG.....


    huh huh, bung.............

    greg
     
  4. muddin4fun

    muddin4fun 3/4 ton status

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    I'm running a breather...and I've changed it twice.
     
  5. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    You should be running a breather and a PCV valve...

    Rene
     
  6. BorregoK5

    BorregoK5 1/2 ton status

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    Most any motor will have a little bit of blow by. If your breather doesn't have a baffle below it on the valve cover, it will dirty up your valve covers fairly quick (especially if you play in the high rpm's). If your route your pcv (a good one) back into the intake, you can burn that off rather than coat your engine. It can be hard to keep those from leaking though.
     

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