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Interesting F300UCA

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  • Interesting F300UCA

    On another thread OP and I both searched for a poppit/PRV for this motor.
    Damned if either of us can find it.

    Another case of a Yam isn't a Yam.....?

  • #2
    You are looking for that which is not there.

    The 4.2 liter block does not use a pressure relief valve.

    Why?

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    • #3
      Guessing the passages on that big bastard are large enough to handle the surge of pressure. Rod may hate the F350 but I am not sure I would want to wrestle the 4.2 either.

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      • #4
        I have a feeling the pump cannot pump too much water to cause a problem

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        • #5
          just as the old inline mercs, Yamaha engineers decided the 4.2L did not need a water pressure control valve.
          it appears to work.

          I do have a 4.2L long block coming.

          gotta do yet another powerhead.

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