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  1. L

    Oil

    Hi guy's. I have a question about my 3.7 Mercruiser in my 1989 21' Galaxy Magna,cuddy walk around. My 1989 3.7 Mercruiser has great oil pressure at start 60-65 psi. After about 30 minutes of 3400,3450 rpms, the oil pressure drops to approximately 5psi or so when returned to idle. I am...
  2. L

    Prop size and Pitch?

    Hello all, i am wondering, can anyone tell me what size prop and with what pitch i should be running? I have a 1989 21' Galaxy Magna walk around cuddy. It has a 3.7 165 hp Mercruiser with an Alpha One outdrive. The existing prop is 14 1/2" and 17 pitch. My WOT RPM's range sticker says...
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