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Merc 43lh cooling system

currenjw

New member
"I am rebuilding this engine

"I am rebuilding this engine and do not wish to run sea water thru it and want to install a closed system with a large heat exchanger I have. I'll add a sea water pump to cool it,pass thru exaust manifolds and dump after the riser.
I suppose the engine's circulation pump could be automotive. Any suggestions as to routing etc???"
 
"There are closed cooling kits

"There are closed cooling kits for the 4.3, you should consult them for the best routing, you are on the right track though."
 
They also have one that uses t

They also have one that uses the Alpha 1 impeller and doesn't require a seawater pump. I would include the manifolds in the closed fresh water cooling.
 
"Good thought. A lot of heat,

"Good thought. A lot of heat, but if the system can handle it I'll sure do it. Thanks.

Does the O/D's upper gear case require cooling with it's water pickup system or can an engine mounted sea water pump (more durable)do the whole job? I've been away from motor boats for 20 years."
 
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