2006 Mercury 90 ELPT Compression test

[methaneman]

Hi,
I have a 2006 Mercury 90ELPT that came on the used Pontoon boat I bought last year. I don't know the hours on the motor. Last year I replaced the water pump and idea control valve, this year a changed the spark plugs, engine oil and gear box oil. When I changed the spark plugs I did a compression test, Cyl 1 150 PSI, Cyl 2 150 PSI, Cyl 3 140 PSI, Cyl 4 140 PSI. The good news is they are within 10%. I called Mercury to see if they had any spec's on this motor for compression and they didn't. Does anyone know if these are good numbers for the compression test?
Thanks,
Dan

 

[galamb]

The last merc published specs that I have are for the 2002 models.

The spec is (minimum) 135 psi per cylinder with a note that rebuild should be considered if the reading is below 120 psi. Your numbers sound fine.

 

[methaneman]

Thanks!