Water Pump Part Number??

8

88PartyBarge

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Can someone please help me with the water pump impeller part number for a Mercury "Classic Fifty"?? The engine is a 1987 or 1988 (not sure which), and the serial number is 0B113684.

I bought a 18-3007 impeller as a replacement to OEM 47-8993, but it is too large to fit into the housing. The part number on the housing 46-77821. I am very confused .... any help would be appreciated.
 
saumon

saumon

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Re: Water Pump Part Number??

OEM is 47-89983 and Sierra is 183007 so you have the right one. You must turn the driveshaft clockwise while pushing on the housing so the impeller bend in the right direction.
 
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88PartyBarge

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Re: Water Pump Part Number??

Oh, I see .... how does the impeller rotate then if it is that tight to the housing and not connected to the drive shaft?
 
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88PartyBarge

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Re: Water Pump Part Number??

OK, so I just read that there is a "key" that locks the impeller to the driveshaft (this makes much more sense). What key part number goes with this water pump??
 
saumon

saumon

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Re: Water Pump Part Number??

The key is 28-56662. Did you loose it?
 
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88PartyBarge

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Re: Water Pump Part Number??

Maybe ... I did not notice any key when I dis-assembled the lower unit, and it is no where to be found.

It makes a lot more sense now ... thanks for the help!
 
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