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VCADs shows 20% compression loss on 4th cylinder D12d engine.. is VCADs accurate?

Discussion in 'Volvo Forum' started by bravoo67, Mar 29, 2012.

  1. Mar 29, 2012 #1
    bravoo67

    bravoo67 Light Load Member

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    Mar 15, 2012
    Brooklyn NY
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    VCADs shows 20% compression loss on 4th cylinder of Volvo D12d engine.

    My questions are:

    is VCADs accurate??

    and what would this compression loss feel like on the engine?

    big thank you in advance for any responses :)
     
    bravoo67, Mar 29, 2012
    bravoo67, Mar 29, 2012
    #1
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  3. Mar 29, 2012 #2
    Pablo-UA

    Pablo-UA Road Train Member

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    Borispol, Ukraine
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    engine make blow smoke and missfire.

    first of all remove exaust manyfold and check for oil in exaust passages, if no oil check valves for damage. Sometimes you can see damage throught passages.

    Remove valve cover and inspec JB.

    Really VCADs test is relativelly accurate. VCADs checks cranking speed.

    To be sure, pull out EECU fuse ore relay and crank engine with starter. You can feel like starter freely "skips" damages cylinder without resistance.

    I sugest bad valve
     
    Pablo-UA, Mar 29, 2012
    Pablo-UA, Mar 29, 2012
    #2
    123456 and bravoo67 Thank this.
  4. Mar 29, 2012 #3
    bravoo67

    bravoo67 Light Load Member

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    Mar 15, 2012
    Brooklyn NY
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    Thank you Pablo!! you are the best !!
     
    bravoo67, Mar 29, 2012
    bravoo67, Mar 29, 2012
    #3
  5. Apr 11, 2012 #4
    bravoo67

    bravoo67 Light Load Member

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    Mar 15, 2012
    Brooklyn NY
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    my mechanic took the valve cover off and check the valves, he said they are OK ,

    can he tell it just by taking the valve cover off or should he take some other parts off?

    I'm thinking that maybe injectors wiring harness has some circuit to the ground or something like that and misfires one injector ??
     
    bravoo67, Apr 11, 2012
    bravoo67, Apr 11, 2012
    #4
  7. Apr 12, 2012 #5
    Pablo-UA

    Pablo-UA Road Train Member

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    Borispol, Ukraine
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    you cant see damaged valve from valve cover. remove the cyl head
     
    Pablo-UA, Apr 12, 2012
    Pablo-UA, Apr 12, 2012
    #5
    123456, bravoo67 and davidtruckervan Thank this.
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