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  1. M

    merc 3.0 overheat @ idle and WOT

    I have a merc 3.0 4cyl 140hp in my '87 four winns boat that is overheating at idle and WOT. It does not overheat at mid throttle but it does run hotter than norm. I understand the impeller may be the culprit for the idle overheating but could it also be the cause for the WOT overheat issue? If...
  2. M

    Correct prop - 16' 140hp I/O?

    I have a Four Winns 16' with a 140hp Merc I/O. Right now I am running a 14.5 17p 3 blade aluminum prop. I have 2 other props that are 17p but 14.75, and 15" diameters. I am looking for the right pitch-diameter for tubing, and skiing. What RPM range should I be trying to achieve at WOT? Any...
  3. M

    Ujoints/gimbal bearing? Plz help a Newbie.

    First off, I am getting my 1st post and my intro out of the way. So, hello to you all. My boat: 86' four winns, I/O 140hp MerCruiser with an Alpha 1. http://assets0.fourwinnsmarketing.com/past_product/catalogs//1986/Runabouts%20&%20Deck%20Boats/08%20160%20Freedom%20(p8).pdf My problem(s)...
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