Reply To: compression 57 3 hp Johnson

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October 12, 2019 at 12:28 pm #185114
David Stanton
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    If your compression gauge has a rubber hose on it, and the checkvalve is at the gauge end of the hose, the reading will be low due to the volume of the hose, but the difference you see between cylinders indicates a problem with the one reading 40 even if the gauge is reading low.