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  1. R

    Help!! I need more help "overheating"

    I'm back and still have problem with over heating over 3000 rpms. New impeller, new thermostat, new circulation pump, new manifolds and risers. I can run the motor at the dock at 3500 rpm and it stays cool, then temp rises a little when I idle it back. The Vacuum goes to 16 at 3500 rpms. Out on...
  2. R

    need advice on center risers

    I posted a thread yesterday now I can't find it. I'm still new at this. I replaced the manifolds and risers on my '73 mercruiser 302 with the newer style center risers. separation plates did not come with the gaskets. Does anyone know if I need to install the barrier between the riser and the...
  3. R

    Do Center risers need separation plates?

    I have a quick Question. I replaced the manifolds on my mercruiser 302 888 with manifolds with center risers. Separation plates didn't come with the gaskets. Do I need to install separation plates for it to work? R Harry
  4. R

    over heating above 3000 rpm

    1973 mercrusier 302 888 Replaced stern pump, replaced thermostat, removed and cleaned manifolds and risers, also have checked all incoming lines for clogs, and engine still overheats above 3000. At 2500 rpm motor seems to run hotter than normal, but fluctuates up and down. Is it possible for...
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