Normal Compression Test reading - Defender Source
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  #1  
Old January 30th, 2013, 12:02 PM
wantone
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Rick Thompson
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Normal Compression Test reading

hi gents! i am changing out my plugs and wires soon and figure while i am at it i may as well hook up the compression tester and test each cylinder and do a leakdown. What are the normal readings for compression and what is acceptable for leakdown and for how long of a time?

thanks!
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  #2  
Old January 30th, 2013, 12:05 PM
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Doug Crowther
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High 140's. Not sure on leak down
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Old January 30th, 2013, 12:23 PM
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Just curious, if you have good compression why would you do a leak down test?
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Old January 30th, 2013, 02:14 PM
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20% is acceptable , i would be more concerned where its leaking from top end or bottom end
how does the truck run does it idle good have power any engine codes missfires?
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Old January 30th, 2013, 02:52 PM
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Truck runs fine. Has 150k on it, i have the tool & will be changing the plugs so why not check it? How long should i do the leakdown for? 5 min? 20 ?
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Old January 30th, 2013, 03:06 PM
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Usually with the proper tool it's a instantaneous reading example 80psi on in gauge to anything above 20psi on the leak down side gauge .. Make sure your on the compression stroke of the cylinder your doing. I usually do a compression and leak down on a motor that’s at operation temp then another leak down when cold just to make sure . Also you might have to hold the crank from spinning if you put too much air in it
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