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Testing compression while out of frame

Discussion in 'XJ Technical Chat' started by caniculaveritas, Mar 9, 2009.

  1. caniculaveritas

    caniculaveritas Member

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    So i pulled the motor before checking the compression.....anyone think it would be a bad idea to just do it on the shop floor with jumper cables...carbs and exhaust is off so wot is no problem.
     
    caniculaveritas, Mar 9, 2009
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  2. bill

    bill Active Member

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    I don't see what it would hurt. You don't want spark of fuel anyway. You may have to brace it somehow - not sure how much it would jump around.
     
    bill, Mar 9, 2009
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  3. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    not a bad idea at all. That's the only way you CAN test a pre-removed motor. Sometimes you gotta bring your own battery, cable and starter.
     
    bigfitz52, Mar 9, 2009
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  4. TIMEtoRIDE

    TIMEtoRIDE Active Member

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    You left the oil in ?
    Blow compressed air around the sparkplugs before pulling them, just like everybody else does, everytime (yeah right).
     
    TIMEtoRIDE, Mar 9, 2009
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  5. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    Carbs and exhaust off, plugs out, you're only compressing one cylinder. They don't jump around much at all, the motor is heavy enough to help you hold it still. Singles (especially BIG singles) can be a different story...
     
    bigfitz52, Mar 9, 2009
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  6. caniculaveritas

    caniculaveritas Member

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    SWEET! Thanks for reaffirming that for me! Really don't want to take the head off and leave the jugs in just to find out the rings could use replacing soon!
     
    caniculaveritas, Mar 10, 2009
    #6

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