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Thread: Cessna 150 with good compression but oil in #4
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Old 13th May 2020, 17:59
  #11 (permalink)  
stevef
 
Join Date: Feb 2006
Location: Station 42
Age: 69
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I'd suspect worn valve guides allowing oil into the cylinder.
Your compressions will be good but eventually the valve/s may not seat properly or begin sticking when the stem/guide clearances increase.
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