The Sierra 18-3434 Water Pump Repair Kit is designed for Yamaha 40HP, 50HP and 60HP outboard engines across applicable 2-Stroke and 4-Stroke applications. Replacing Yamaha 63D-W0078-03, 63D-W0078-01 and 63D-W0078-00, this kit includes the key water pump service components required to restore cooling water flow and maintain reliable engine temperature control.
This kit is supplied without the main water pump housing, making it a practical choice when the existing housing remains in good serviceable condition. If the housing is worn, scored, cracked or damaged, use the Sierra 18-3415 Water Pump Kit With Housing instead.
Suitable for Yamaha 40HP, 50HP and 60HP outboards using Yamaha water pump kit 63D-W0078-03, 63D-W0078-01 or 63D-W0078-00.
Suits outboard models:
Two Stroke: 40V 40VETO 40VMHD 40VHWTO (1995-19), 50HET 50HETO 50HMHD 50HMHO 50HWHTO (1996-19)
Need help with fitment? Contact us with your engine model and serial number and we'll help check suitability.
Does Sierra 18-3434 Include The Water Pump Housing?
No. Sierra 18-3434 is supplied without the main water pump housing. If the housing also requires replacement, use the Sierra 18-3415 Water Pump Kit With Housing.
What Is The Difference Between Sierra 18-3434 And Sierra 18-3415?
The Sierra 18-3434 Water Pump Repair Kit is intended for servicing the pump when the existing housing remains serviceable. The Sierra 18-3415 Water Pump Kit With Housing covers the same Yamaha 40HP, 50HP and 60HP application family but also includes a replacement water pump housing.
Why Should I Service My Outboard Water Pump?
Routine water pump servicing helps maintain cooling water flow, supports stable engine operating temperature and reduces the risk of overheating caused by worn pump components.
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