Water Pump/Impeller 1998 Mercury 4 Stroke

soulriderleo

Cadet
Joined
May 20, 2013
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I have a 1998 Mercury 4 Stroke Bigfoot (Carburetor) 50 ELPT 4 S - Serial Number 0G621113. I believe I need to replace the Impeller because even though it spits out water, the warning alarm still comes on when idling for more than 2 minutes. Seems like it may not be moving enough water at idle? (bad impeller)?
Anyway, does anybody have a Service Manual for this motor? And should I replace the whole water pump assembly or just the impeller and needed parts?
One more thing. Is there a better propeller I could use on this motor? I mostly take the boat in salt water, bay/ocean.
Thank you for your help :)
 

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