Sierra 18-3446 Water Pump Kit
Price: $60.62
Save: $24.37
(28% Off $84.99)
Part # 18-3446
2nd Day Air for $2.99 More Eligible
This item is found in the following Product Families
Replaces OEM part #
  • MERCURY MARINE 46-70941A3
  • For: Mercury/Mariner 4/4.5 HP


  • (1) 18-3039 Impeller
  • (1) 18-3139 Impeller Plate
Average Customer Review for Sierra 18-3446 Water Pump Kit
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7.5 merc
by Ron from Tucson, Arizona on March 18, 2012
Fast ship,easy install no problems on this end.
(1 of 2 people found this review helpful)
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Will this fit a 1969 7.5 hp Mercury?
If your serial number is above 4131610 this kit will work.

Will this fit a 9.8 hp mercury 1980?

Is this kit for the ,456 i.d. shaft or the .438 i.d. shaft?
The only thing that we can do is match it up to the engine. If you provide us with your engine information we would be happy to help you find the right one.

Will this fit my 7.5hp 1986 motor?
Yes. The is the correct kit for a 1986 7.5 hp Mercury.

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