Engine flushing

[Brent2]

I have a 1996 Chaparral Sunesta 230 that has always been on a lake but just got moved to the ICW. Is the engine cooling system a closed system or do I have to flush the engine and how? It’s a Mercruiser engine

 

[Scott Danforth]

Unless you have a heat exchanger, you are raw water cooled

You can flush with a set of muffs or a kit such as superflush sf-400

 

[Scott06]

I have a 1996 Chaparral Sunesta 230 that has always been on a lake but just got moved to the ICW. Is the engine cooling system a closed system or do I have to flush the engine and how? It’s a Mercruiser engine

Post a pic of your engine. If it has a closed cooling system you will have a heat exchanger that is about 4" in diameter and 18" long or so right on top front of engine - goggle merc closed cooling system to see what one looks like installed

 

[Bondo]

I have a 1996 Chaparral Sunesta 230 that has always been on a lake but just got moved to the ICW. Is the engine cooling system a closed system or do I have to flush the engine and how? It’s a Mercruiser engine

Ayuh,...... Welcome Aboard,...... If you can see a radiator cap in the motor bay, that's closed freshwater cooling,.....

If you can't find a radiator cap,.... it's raw water cooled, 'n yes, you should flush it as often as possible,....

 

[ROY WILLIAMS]

I have a 1996 Chaparral Sunesta 230 that has always been on a lake but just got moved to the ICW. Is the engine cooling system a closed system or do I have to flush the engine and how? It’s a Mercruiser engine

I did the heat exchanger coolant on my MCM470 . I used antifreeze coolant 65% distilled water 35% ... the engine has the pervious owner [1985] ... THEN did the coolant pump [WATER ] then the CAM SHAFT CORROSION AREA..OF THE COOLANT SEAL PUMP...I did the cam shaft cap to setup the cam rod [heat it ] ... I did not use later and NO coolant failures .. also drain the sea water plugs drained it out ..sea water flush the heat exchanger ....fresh water ..

 

[crazy charlie]

Either way ,a fresh water flush after every use is the best possible care you can take of your mercruiser block,manifolds,risers,heat exchanger.If you are in a slip ,lay on your belly and reach down to your trimmed up drive and put muffs on it and run until you are up to operating temp.Charlie