496 Ho High Temp
#1
Registered
Thread Starter
Join Date: Apr 2010
Posts: 81
Likes: 0
Received 0 Likes
on
0 Posts

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
#2
Gold Member


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.
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.
#3

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.
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.