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compression test

Discussion in 'The Garage' started by 1979jimmy350, Oct 31, 2004.

  1. 1979jimmy350

    1979jimmy350 1/2 ton status

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    would it be ok to do a compression test with the exaust manifolds off? i thought it might be easier to do it while i am putting on hedders. Also should i have all the plugs out at the same time or should i only take the one out that i am doing the test on
     
  2. diesel4me

    diesel4me 1 ton status Premium Member

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    Having no exhaust manifolds wont matter.I'd pull all the plugs,it lets the motor spin over faster--its also best to check the compression while the motor is still warmed up,you get a more accurate reading that way--but its not absolutely nessasary .Look for consistency rather than a certain pressure--if one cylinder is more than 15-20 lbs lower than the others,that one has a problem--they should be about 125-150 lbs on a healthy engine. /forums/images/graemlins/crazy.gif
     
  3. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

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    as Rob said, don't matter.. pull the plugs... should be within 10% of each other..

    if you have a low cylinder when all done, squirt some Marvel or tranny fluid in that one and do it again.. if the number goes higher than the last time, you've got a ring prob and not a valve issue... /forums/images/graemlins/peace.gif
     

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