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Riser and Manifold run warmer on one side!

C

Capchiasson

New member
I have a Mercruiser 350 5.7 l Carburatur open cooling system, running in salt water.
I changed the cylinder head on stb side because the head gasket fail between the two middle ones and it damage the head.
But than I realize that the riser and manifold runs too hot on stb side, So I change Impellor, exhaust manifold, risers, check thermostat, check exhaust flap, flush the engine block, still too hot in stab side at high RPM.
I Notice that the two hose feeding water to the manifold coming out of the thermostat housing were different in temperature the stub one is warmer!?! And the is no restriction n the hose!!!
 
bondo said:
Ayuh,..... Both sides never, ever run the exact same temps,.....
Click to expand...


I agree but Port side is ice cold and Stb side become burning hot at high RPM! this is the reason why I had to change the gasket and the cylinder head! And at the Stb side there is a good water debit at the hose end at the manifold!I even pinch the port hose to send more water to the warmer side but no difference!?!
 
Last edited:
Did this engine always have this problem? Did the engine ever "eat" a raw water impeller? Is it the correct T'stat housing, correctly assembled?
 
Stab the hose there is a good debit at the hose end at the manifold!
I even pinch the port hose to send more water to the warmer side but no difference!?!
 
I have this problem since year I guess! I never had any problems so I never check the risers before. Never had problems with the impellor and the thermostat housing was never removed before and yes it's correctly assemble
 
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