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What is the proper compression for mercruiser 140 boat engine I had a test done and it came back 180 180 175 155 That is within the high low spread but wanted other thoughts?
Wiki User
∙ 14y ago
the cylinder with the 140# reading would be of concern .the rest are good . Sometimes after sitting along time the exhaust and or intake valves could get a little corrosion on the sealing area allowing them to not seal as good . Running the engine for awhile should rid the corrosion and render a better compression test ,If no better readings on the second test , you might have a bad exhaust valve
Wiki User
∙ 14y ago
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