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For the Kiekhaufer Mercury K3. Is there a substitute/replacement water pump impeller?
Many options out there.
You can purchase a reproduction one from
Brian Wilcox
(810) 794-7685
Joe poole
http://fergusonpoolemarine.com/enginecoolingsystem.html
Or Old Mercs
https://www.oldmercs.com/category_s/37.htm
Big Rich @ Old OutboardParts. On EBAY
https://www.ebay.com/itm/MERCURY-KE4-MARK-7-KE7-WATER-PUMP-IMPELLER-WIZARD-WF7-WG7-OUTBOARD-47-24472/133206333920?hash=item1f03b759e0:g:WawAAOSwl8NVXlv8
Or Doug Penn
https://www.oldoutboard.com/
You can also modify a current available impellor to fit.
If your motor still has the 16 square hole intake, you will need the oscillator style impeller available from
The 7 slit or later 3 slit water intake use the rotax style (Vanes) like a conventional water pump.