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Low compression 3 of 6 v6 and manifold petrol washing on 3 only

Discussion in 'Mace Engineering' started by Cruisy2650, Jan 26, 2017.

  1. Cruisy2650

    Cruisy2650 New Member

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    Please help I have low compression on drivers side 3 cylinders 25psi after wet test 50 psi max ..
    petrol washing on same side manifold ports

    Could one chain side be out timing cause this ..?
     
  2. MACE

    MACE Active Member

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    Hi Cruisy2650,

    My sincere apologies for the delay in getting back to you. I hope that your problem has been resolved.

    Going by your member ride, which is either a VZ V6 or VE V6, then it would likely be caused by the timing being out.

    If you have any more questions please don't hesitate to ask.

    Kindest Regards,
    Steve
     
  3. Cruisy2650

    Cruisy2650 New Member

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    Steve,

    Thanks for reply no luck I re done timing and still low compression on r/h side cylinders all 75,70,75 psi

    L/h side 145,135,140 psi
    I see new water pump been replaced and head gasket has no visible breaks but I'm wondering if gasket is stuffed, not sure on these mls type gaskets ..
    Could it be head gasket, I took r/h head off just did a water leak yeast on valves and no leaks, have not done a head off pressure test yet..
    Gasket looks like mostly all the rubber type seal that sits on surface is missing or worn off..
    I hear these gaskets pretty good. I'm wondering if over heated prior to my purchase that's why head compression low..
    I purchased car as is not running, I got going but barely wants to idle and runs severely rough.
    Any help appreciated

    Dean
     
  4. Cruisy2650

    Cruisy2650 New Member

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    Steve,

    Thanks for reply no luck I re done timing and still low compression on r/h side cylinders all 75,70,75 psi

    L/h side 145,135,140 psi
    I see new water pump been replaced and head gasket has no visible breaks but I'm wondering if gasket is stuffed, not sure on these mls type gaskets ..
    Could it be head gasket, I took r/h head off just did a water leak yeast on valves and no leaks, have not done a head off pressure test yet..
    Gasket looks like mostly all the rubber type seal that sits on surface is missing or worn off..
    I hear these gaskets pretty good. I'm wondering if over heated prior to my purchase that's why head compression low..
    I purchased car as is not running, I got going but barely wants to idle and runs severely rough.
    Any help appreciated

    Dean
     
  5. Cruisy2650

    Cruisy2650 New Member

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    Yes is a vz alloytec executive
     
  6. MACE

    MACE Active Member

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    Could be a blown head gasket. Did the car have any fault codes prior to issue?
     
  7. Cruisy2650

    Cruisy2650 New Member

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    This is a recent purchase

    Car was scanned by a friends work gscan scanner and he said had no faults at all .
     
  8. Cruisy2650

    Cruisy2650 New Member

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    I see car has a new water pump
    On it so I suspect it may be a
    Gasket ..
     
  9. Cruisy2650

    Cruisy2650 New Member

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    Picture of block
     

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  10. Cruisy2650

    Cruisy2650 New Member

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    Head gasket
     

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  11. Cruisy2650

    Cruisy2650 New Member

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    Other side of gasket if it helps
     

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  12. MACE

    MACE Active Member

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    You will need to clean the head and block and measure for straightness on each of the mating surfaces. Any engine machine shop can do the resurfacing for you, however, you can have a go at it yourself ;)



    If you need any gaskets, head bolts, etc we can help out if required.

    If you have any more questions please don't hesitate to ask.

    Kindest Regards,
    Steve
     
  13. IBLOWN

    IBLOWN Active Member

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    MLS gaskets need to have both mating surfaces (Head & block) DEAD flat, DEAD clean and have a certain surface finish. If one or all of these situations arent followed, they will leak. I would suggest you have your head decked and check the block for straightness (Very carefully).
     
  14. Cruisy2650

    Cruisy2650 New Member

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    Thanks Steve,
    For sure will see you for gaskets and bolts once this sorted

    Does gasket look stuffed visually to you?
    I will check surfaces
     
  15. MACE

    MACE Active Member

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    This is generally true, however, Alloytec gaskets are a little more forgiving given that they come impregnated with a silicone bead around ports

    Hard to tell from those pics, however the gaskets seem ok.
     
  16. IBLOWN

    IBLOWN Active Member

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    Yes but if the surfaces arent flat, the silicon alone isnt going to hold compression.
     
  17. Cruisy2650

    Cruisy2650 New Member

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    I just see sections of the silicon missing.

    I will check if straight after work..
    Trying to do this on a budget but get it right still
    Not easy job if I put back together and low
    Compression still, I would cry
    These cars built
    to test patience, and with 4
    Young kids surrounding me while Doing It, my kids and Holden have tested me haha
     
  18. MACE

    MACE Active Member

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    Yeah kids and cars will test even the greatest of people :(
     
  19. Cruisy2650

    Cruisy2650 New Member

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    Appreciating the forum support
    That's for sure.
    I'm
    Use to working on Valiant Chargers ))
     

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