496 Ho High Temp

Old 10-07-2013, 09:33 PM
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Default 496 Ho High Temp

I have a 35 Fountain with 496 ho's and after replacing the water pump with a new one one the motor is still running 10 deg to high , I pulled the heater exchanger and cleaned it but was just wondering how do I reverse flush the system so I could try to get any trash out of the oil cooler. Thanks for any help. Blake
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Old 10-07-2013, 09:45 PM
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Take the hose off the raw water pump. Then take the port hose off the close cool heat exchanger (log on front of your engine) put a garden hose in it full bore!

Few other things you might check:
1 - You sure its not stuck in the riser? Flush it too.
2 - When the close cool log was off, take the ends off and run a coat hanger thru all the holes. I clean mine with muratic but some say thats bad...
3 - Sure its not blocked at the low water pickup? Last season I hit an old piece of rotted wood and it plugged all my low water pickup holes.
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Old 10-07-2013, 10:05 PM
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Did you remove the old impeller in one piece, or is/was some (piece/parts) missing?

Also, how old is your antifreeze? It only get's about 6 or 7 seasons on it before it starts to silt up and lose flow. If it's pink, its good to go. If it's starting to get grey/metallic in color, it's time to change.
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