Replaced impeller 496 ho still no water pressure
#1
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Replaced impeller 496 ho still no water pressure
496 HO was running too high temp +-180°
engine in guardian mode because exhaust temp too high
replaced the impeller (while boat was in the water)
impeller was completely toasted
brass ware plate showed some signs of wear but not dramatic
Started engine up (+-2 min at idle) still no water pressure at the exhaust manifolds (boat in the water)
Does pump needs to be bleeded? How to?
With old worn out impeller I still had some pressure at the manifolds ....
less with new impeller
All ideas / suggestions welcome
What is correct sea water pump pressure @ idle?
engine in guardian mode because exhaust temp too high
replaced the impeller (while boat was in the water)
impeller was completely toasted
brass ware plate showed some signs of wear but not dramatic
Started engine up (+-2 min at idle) still no water pressure at the exhaust manifolds (boat in the water)
Does pump needs to be bleeded? How to?
With old worn out impeller I still had some pressure at the manifolds ....
less with new impeller
All ideas / suggestions welcome
What is correct sea water pump pressure @ idle?
#5
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If there are wear grooves in the pump, it may not pump. Common problem on the 496. I just switched mine over to the stainless Hardin pump so I wouldn't have to worry about it again.
Last edited by underpsi68; 07-21-2013 at 01:54 PM.
#7
Yea, thats exactly what happened to me on my 25 outlaw, 496 ho. Replaced impeller and flushed out the entire system, still no flow. Replaced the pump, fixed. I guess if the pump housing has the slightest bit of wear it doesn't work at all or very little. Hope this helps. Good luck.
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thnx to all reply
I know replacing complete pump is all way to go but
still don't understand with 1/4 of impeller I had "some" water pressure
with new impeller , none...
I know replacing complete pump is all way to go but
still don't understand with 1/4 of impeller I had "some" water pressure
with new impeller , none...
#9
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Because the sides of the old impeller were worn into the grooves.