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oil coming out of pcv valve

Discussion in 'The Garage' started by cegusman, Dec 10, 2003.

  1. cegusman

    cegusman 3/4 ton status

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    ? for a friend, 87 K5 350 rebuild .30 over. What would cause oil to pour out of the pcv valve?

    Update Below
     
  2. nvrenuf

    nvrenuf NONE shall pass! Premium Member

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    Do the valve covers have a baffle? Are they OE or aftermarket?

    If they do, there's probably bad news in his future, could be lots of blowby.
     
  3. cegusman

    cegusman 3/4 ton status

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    More info on the motor:

    OE valve covers
    305 HO Heads
    Heads were rebuilt with motor
    exhaust ports where ported
    Intake ports left alone

    If he puts a breather on the other side (oil file plug)it does the same thing.
     
  4. HarryH3

    HarryH3 1 ton status Author

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    The most likely cause is that the rings haven't sealed properly, so combustion pressure is leaking past them. /forums/images/graemlins/frown.gif How many miles since the rebuild? If he's lucky it might seal up with some miles, but it's more likely that the engine is going to have to come apart again to find out what is wrong. /forums/images/graemlins/eek.gif
     
  5. cegusman

    cegusman 3/4 ton status

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    Motor has about 10,000 miles on the rebuild.
     
  6. rcpilot

    rcpilot 1/2 ton status

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    [ QUOTE ]
    The most likely cause is that the rings haven't sealed properly, so combustion pressure is leaking past them. /forums/images/graemlins/frown.gif How many miles since the rebuild? If he's lucky it might seal up with some miles, but it's more likely that the engine is going to have to come apart again to find out what is wrong. /forums/images/graemlins/eek.gif

    [/ QUOTE ]

    I 2nd that /forums/images/graemlins/eek.gif /forums/images/graemlins/eek.gif
     
  7. bigred81

    bigred81 1/2 ton status

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    Sounds like the motor has a major problem. Just for kicks and grinds have him start the motor and pull the oil fill or the pvc valve out and see if it has blow by. If it was not doing this before and just now started the motor is going to need another rebuild. One more thing check to see if the pvc valve is not clogged because this will cause it to blow the oil out. One more idea maybe the wristpin in one of the pistons has started to walk and eat the clyinder wall. /forums/images/graemlins/eek.gif I had one motor do this to me. Hope this helps you some.

    James Startz
    aka: bigred81
     
  8. HarryH3

    HarryH3 1 ton status Author

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    After 10,000 miles the rings should have fully seated. It sounds like it's time to tear it apart and find out what went wrong. /forums/images/graemlins/frown.gif
     
  9. mudjunkie 82

    mudjunkie 82 1 ton status GMOTM Winner

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    Do a compression check on all 8 cylinders
     

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