5.5 thermostat/non-thermostat block

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  • January 21, 2022 at 11:02 am #253165
    melugin
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      I’m going to look at a late fifties Evinrude which has had the block replaced with a NOS thermostat block.  They have used the early exhaust cover and head.  Of course the water passages don’t line up and one is open on the cover side.  I am pretty sure that this won’t work, am I right or wrong?

      January 21, 2022 at 5:51 pm #253196
      crosbyman
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        Canada Member

        it won’t if the water  cant get back out…

        Joining AOMCI has priviledges 🙂

        • This reply was modified 3 years, 11 months ago by crosbyman.
        January 22, 2022 at 10:10 am #253216
        Seahawk
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          US Member

          If its a 35hp Engine it won’t work.  There is a return tube coning from the power head back down to the water pump to recirculate the water until it reaches 150°F where then the thermostat redirects the water to exit out a port on the mid section.

          January 22, 2022 at 10:11 am #253217
          Seahawk
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            US Member
            Seahawk wrote:

            If its a 35hp Engine it won’t work.  There is a return tube coning from the power head back down to the water pump to recirculate the water until it reaches 150°F where then the thermostat redirects the water to exit out a port on the mid section.

            it might be the same for a 5.5hp not sure

            January 23, 2022 at 1:54 pm #253269
            melugin
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              This a 5.5 powerhead.

               

              January 23, 2022 at 10:25 pm #253306
              fleetwin
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                US Member

                I’m confused here..  So someone is trying to replace a pre 59 5.5hp block (no thermostat), with a 59 or later block with a thermostat?  If so, this isn’t gonna work for a few more reasons.  Nonetheless, the older exhaust cover will surely not fit on the 59 and later powerhead, but it seems that you know this already so I’m not sure I understand what you are asking about….

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