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Overheat problem

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  • Overheat problem

    I'm not new to this kind of stuff but this time I am stumped. 160* thermostat, new RW and circulating pumps. System flushes both ways, RW and Fresh water. When I hook a hose to the RW, plenty comes out the exhaust. Not loosing coolant. Will idle all day but under a load, after a few minutes, it spikes really fast like the water was shut off. Any ideas ?
    1988 26' cuddy
    1975 20' open
    16' Sandpiper
    14' Certified Fiberglass

  • #2
    timing or order of plug wires. instant overheat if wrong
    Atlantic City, NJ
    1982 Cuddy, Rebuilt 351 .060 rings, Edelbrock carb

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    • #3
      I do believe Ship nailed it. The only other thing I can think of is possibly dead spots in the exhaust manifolds, but that would signal at idle too. Are you plumbed low point to high point?
      1987 26' Hardtop
      1996 20' Walkaround Cuddy

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      • #4
        Timing and wires are right. Low point to high point ? HE is in bilge and pumps plenty of water to the exhaust manifolds.
        1988 26' cuddy
        1975 20' open
        16' Sandpiper
        14' Certified Fiberglass

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        • #5
          Risers are full of packed tight MUD. Cleaned them out and if I have gaskets in my stash, she goes back in Sunday.
          Lesson here. After pushing through thick mud, don't let her sit. Flush out or at least run in clean water.
          1988 26' cuddy
          1975 20' open
          16' Sandpiper
          14' Certified Fiberglass

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          • #6
            Dredging the canal again are ya?
            1980 pilot house 351
            1988 260 predator 408

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            • #7
              Jerry, no fair ! we never trouble shoot dredges. but we will include them now.
              Atlantic City, NJ
              1982 Cuddy, Rebuilt 351 .060 rings, Edelbrock carb

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              • #8
                It is amazing how much mud a 20' boat can move. I have 6' of water under my boats and the neighbor, just behind the boats has mud Thats what ya get when ya piss me off. Or maybe it is just mother nature.
                1988 26' cuddy
                1975 20' open
                16' Sandpiper
                14' Certified Fiberglass

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                • #9
                  Great time to install a fresh water flush.

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                  • #10
                    Originally posted by Quik Fix View Post
                    It is amazing how much mud a 20' boat can move. I have 6' of water under my boats and the neighbor, just behind the boats has mud Thats what ya get when ya piss me off. Or maybe it is just mother nature.
                    Just Mother Nature. That’s my story and I’m sticking to it.
                    Mark
                    1990 26’ open 351W Indmar
                    1987 30’ Blackwatch twin 351W Crusaders (sold)

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                    • #11
                      Originally posted by Pequod View Post
                      Great time to install a fresh water flush.
                      I have one. Great time to actually use it.
                      1988 26' cuddy
                      1975 20' open
                      16' Sandpiper
                      14' Certified Fiberglass

                      Comment


                      • #12
                        Great way to dig steamers too. Well not really cause they die soon
                        '78 20ft Cuddy
                        Mercruiser 350 FWC preVortec w/Carb

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                        • #13
                          Now I'm hungry.
                          1987 26' Hardtop
                          1996 20' Walkaround Cuddy

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                          • #14
                            Originally posted by Quik Fix View Post
                            Timing and wires are right. Low point to high point ? HE is in bilge and pumps plenty of water to the exhaust manifolds.
                            Yep. My HE outgoing enters the back of the manifolds and exits at the top front. It got rid of the hot spots I had up front.
                            1987 26' Hardtop
                            1996 20' Walkaround Cuddy

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                            • #15
                              Click image for larger version

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ID:	32666 Don't mess with me if you ever want to use your dock or boatlift .
                              1988 26' cuddy
                              1975 20' open
                              16' Sandpiper
                              14' Certified Fiberglass

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