Replace I/O Water Pump

biloxiriver

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Aug 20, 2002
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Well my friend and I did it today; we ran his 165 mercruiser w/250 GM in line, doing carb repair work, and both of us thought the other turned on the water hose - now, we get no water. We assume we burned up the water pump in the outdrive. Question - is the removal and replacement of the water pump impeller in a 165 mercruiser a projec that someone with no experience doing this should do?? I have been told that it is not the removal that is the problem, it is getting it back together correctly that is the issue. What do ya'll think?
 

Bondo

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Re: Replace I/O Water Pump

Go to the top of this page......<br />Click on Manuals......<br />Buy 1.....<br />READ It......<br />Then, It's a Piece of Cake.....<br /><br />BTW, Buy the Complete Waterpump Kit.... I'm betting you Fried the housing Too....
 

biloxiriver

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Re: Replace I/O Water Pump

Thanks bondo, got a book, have read it, seems simple enough. Guess we'll have to give it a shot. Best price, so far, in owners area (Orange Beach, AL) is $250.00 for a repair shop to do it.
 

Bondo

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Re: Replace I/O Water Pump

If you've got an Early Mod.1, with the Plastic Flush Screw in the gearhousing, You'll need Part # 18-3321.... That's $77.56 list, $43.30 if your NAPA Auto Parts Guy Likes You....<br />Or, If you've got the Late Mod.1, You'll need #18-3317.... $65.60 list, $36.83 jobber...<br /><br />That's the Complete , w/housings...<br />At your local NAPA...
 

biloxiriver

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Re: Replace I/O Water Pump

Thanks man. How do I know if it is a late model or an early model??
 

Bondo

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Re: Replace I/O Water Pump

Early Mod.1, with the Plastic Flush Screw in the gearhousing,
 
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