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  1. M

    Mercruiser 5.0 twin engine high water pressure

    Thanks - will check the T out My 4000 rpm is what I run to get up on a plane (when hull is clean) and bring in down to 3300 rpm and still get 35 km/p - the fuel reading at 4000 + rpm scares me - I can go higher to 4600 rpm but I've seen bad things happen at WOT and try and treat my engines...
  2. M

    Mercruiser 5.0 twin engine high water pressure

    This is a better pic of water flows
  3. M

    Mercruiser 5.0 twin engine high water pressure

    MUC - the two hoses that come out of the thermo housing go to the bottom of the ss manifolds each side via T fitting that joins hoses 23 and 6 (starboard side) and 22 and 5 (port side) and enters the manifolds via the check ball fitting (item 8) I put a gauge on both manifolds and the PSI...
  4. M

    Mercruiser 5.0 twin engine high water pressure

    Thanks One area I have not tested is the actual pressure in the manifolds so will try and rig up a manual pressure gauge there. Given there is just one pipe from the thermostat housing to the manifold (on each side) I assumed it would be the same pressure.
  5. M

    Mercruiser 5.0 twin engine high water pressure

    Thanks I checked both exhaust flaps when I had the manifolds off and they are both there and flipping up so seem okay On my Maxum (now sold) with the same engine / drives, it had two ways for the exhaust / cooling water to get out - thru the prop hub but also thru two holes on each side of...
  6. M

    Mercruiser 5.0 twin engine high water pressure

    Thanks for the responses Its a MPI / raw water cooled / bravo 2 drives. Serial of the starboard engine is 0M334633. Boat is in the water (its 5000 kgs) Pressure reading before this issue arose was the same as the port engine - around 3 psi idle and 10-15 psi at 3000 rpm. This is both via...
  7. M

    Mercruiser 5.0 twin engine high water pressure

    Hi I have twin 5.0 Mercruisers (one is 2002 and the other 2017) - Both have Hitek stainless steel manifolds (around 7 years old) Starboard engine has suddenly shown an increase in water pressure to over 35 psi at 3000 rpm - port is normal (3-4 at idle and 17 psi at 3000 rpm) No high temps...
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