The Sierra 18-3434 water pump repair kit is an aftermarket cooling system service kit designed for selected Yamaha 40HP, 50HP and 60HP outboard engines. Replacing Yamaha 63D-W0078-03, 63D-W0078-01 and 63D-W0078-00, this kit includes key water pump service components required to restore cooling water flow and maintain reliable engine temperature control.
This kit is the version supplied without the water pump housing. If your existing housing is in good condition, the Sierra 18-3434 is a practical service kit for routine water pump maintenance. If your housing is worn, scored or damaged, use Sierra 18-3415 instead, which includes the replacement water pump housing.
The Sierra 18-3434 is the water pump repair kit version supplied without the water pump housing. If your existing housing is worn, damaged, cracked or scored, the recommended alternative is the Sierra 18-3415 Water Pump Kit with Housing, which includes a replacement water pump housing and associated service components.
For customers wanting an original manufacturer option, the Genuine Yamaha 63D-W0078-03 Water Pump Kit is the OEM version for this application. A lower-cost alternative is also available as the Aftermarket Yamaha 63D-W0078-03 Water Pump Repair Kit.
Yamaha Two Stroke Models:
40V, 40VETO, 40VMHD, 40VHWTO (1995-2019)
50HET, 50HETO, 50HMHD, 50HMHO, 50HWHTO (1996-2019)
Yamaha Four Stroke Models:
F50AEHT, F50AET (1995-2006)
F50FEHT, F50FET (2005-2012)
F50HEHT, F50HET (2013-2014)
F50LB, F50LHB (2015+)
F60AEHT, F60AET (2002-2006)
F60CEHT, F60CET (2005-2012)
F60FEHT, F60FET (2013-2014)
F60LB, F60LHB (2015+)
Suitable for selected Yamaha outboard engines using Yamaha water pump kit 63D-W0078-03, 63D-W0078-01 or 63D-W0078-00. Always confirm your engine model, existing water pump components and part numbers before ordering.
What Yamaha part numbers does Sierra 18-3434 replace?
Sierra 18-3434 replaces Yamaha 63D-W0078-03, 63D-W0078-01 and 63D-W0078-00.
Does Sierra 18-3434 include the water pump housing?
No. Sierra 18-3434 does not include the water pump housing. If you need the kit with housing, use Sierra 18-3415.
What is the difference between Sierra 18-3434 and Sierra 18-3415?
The Sierra 18-3434 Water Pump Repair Kit is supplied without the water pump housing. The Sierra 18-3415 Water Pump Kit with Housing suits the same Yamaha application but includes a replacement housing for more comprehensive water pump servicing.
Which Yamaha outboards does this kit fit?
This kit suits selected Yamaha 40HP, 50HP and 60HP two-stroke and four-stroke models. Refer to the engine compatibility list above and confirm your part number before ordering.
Why should I service my water pump?
Routine water pump servicing helps maintain cooling water flow, reduce overheating risk and protect your outboard engine from cooling system damage.
The Sierra 18-3434 water pump repair kit is a reliable service solution for maintaining Yamaha outboard cooling system performance when the existing water pump housing is still in good condition.
(1)
Australian Dollars
