PCM GT40 cooling issue on one side

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  • wwuboarder82
    • May 2011
    • 2

    • Bellingham, WA

    #1

    PCM GT40 cooling issue on one side

    Hi, I have a 1996 PCM 351 GT40 engine and there seems to be reduced water flow on just the port side of the engine. When running the boat with a hose hooked up in the driveway I can see more water coming out of the right exhaust port in the back. Also the left side of the engine actually get's physically hotter than the right side. Anyone ran into similar issues? Could it be a blockage somewhere or just the flow not being diverted properly?

    Thanks!
    Tags: 351, coolant, gt40, overheating, pcm
  • ers906
    Senior Member of PLANETNAUTIQUE
    • Feb 2010
    • 921

    • Phoenix AZ

    • 2013 G23 550 hp (ordered and awaiting delivery) 2002 Super Sport (coverted into a SAN) 330 hp Excaliber 1994 Sun Tracker Party Barge 115 hp 1989 Horizon 200 Four Winns - sold 1989 Regal Commodore 280 - previous Possibly looking into picking up a 70'2-80's Nautique to rebuild as a ski boat
    #2
    I would use a laser thermometer to figure out the exact difference in temps out of curiosity. Have you ever blown an impeller? I imagine the rubber fin could block water flow pretty well. The transmission cooler should block the impeller shrapnel from entering the block but I have seen where they are mounted on the intake side of the water pump instead of the output. Just a thought
    Eric, Phoenix AZ

    G23 550 hp (finally here)
    2002 Super Air
    1994 Sun Tracker Party Barge 115 hp

    Comment

    • Jono
      • May 2010
      • 85


      • 1996 SuperSport
      #3
      Are the manifolds original? I believe they're supposed to be replaced between 10-15 years. If they are original I'd just go ahead and swap em.

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