Sierra Water Pump Kit 18-3465, Without Housing, Replaces Yamaha 6H3-W0078-02-00, Fits Yamaha 50-70 HP Outboards

The Sierra 18-3465 is a water pump kit built as a direct cross-reference replacement for Yamaha outboard part number 6H3-W0078-02-00. It is designated Water Pump Kit, Without Housing, meaning it is intended for service jobs where the existing pump housing is being reused and only the associated mounting hardware needs to be replaced or refreshed as part of a water pump rebuild.

This kit fits a range of Yamaha outboard models spanning several horsepower classes, including the T50, plain 60, C60, C70, P60, T60, and 70 designations, each tied to its own model-year window as documented by Yamaha. Because outboard water pump service intervals are tied to impeller wear and corrosion of small fasteners, using correctly sized OEM-cross-reference hardware like the 18-3465 helps ensure the pump housing seats and seals properly against the drive shaft housing during reassembly.

The kit contains two 90119-08M87-00 bolts and two 90119-08M13-00 bolts, matching Yamaha's own part numbers and quantities for this service point. As a Sierra part, it is manufactured to be an equivalent for the Yamaha original and is backed by Sierra's standard limited warranty. The kit weighs 0.55 pounds as packaged.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3465
• Product Type: Water Pump Kit
• Configuration: Without Housing
• Weight: 0.55 pounds
• UPC: 808282226596
• OEM Cross Reference: 6H3-W0078-02-00
• Included Components: Bolt 90119-08M87-00 (Qty 2); Bolt 90119-08M13-00 (Qty 2)
• Fitment: Yamaha 50-70 HP outboards (T50, 60, C60, C70, P60, T60, 70)

Fitment

• Yamaha T50, 1997-05
• Yamaha 60, 2001-03
• Yamaha C60, 1997-01
• Yamaha C70, 2000-01
• Yamaha P60, 1997-99
• Yamaha T60, 2003-05
• Yamaha 70, 1997-03

Replaces (OEM)

• 6H3-W0078-02-00

Frequently Asked Questions

Does the Sierra 18-3465 water pump kit include the pump housing? No, the 18-3465 is designated Water Pump Kit, Without Housing, so the pump housing itself is not included; it is meant for jobs where the existing housing is reused.

What OEM Yamaha part number does the 18-3465 replace? The 18-3465 cross-references to Yamaha OEM part number 6H3-W0078-02-00.

Which Yamaha outboard models does the 18-3465 fit? It fits the Yamaha T50 (1997-05), 60 (2001-03), C60 (1997-01), C70 (2000-01), P60 (1997-99), T60 (2003-05), and 70 (1997-03).

How much does the 18-3465 water pump kit weigh? The 18-3465 weighs 0.55 pounds.

What is included in the 18-3465 kit? The kit includes two 90119-08M87-00 bolts and two 90119-08M13-00 bolts, matching the Yamaha OEM part numbers and quantities for this service point.

Is the Sierra 18-3465 a genuine Yamaha part or an aftermarket equivalent? The 18-3465 is a Sierra-manufactured part built to cross-reference and replace Yamaha OEM part 6H3-W0078-02-00, and it is covered under Sierra's warranty rather than Yamaha's.

What is the UPC for the Sierra 18-3465 water pump kit? The UPC for the 18-3465 water pump kit is 808282226596.

Will the 18-3465 fit a Yamaha 60 HP outboard? Yes, it fits several Yamaha 60 HP designations: the plain 60 (2001-03), C60 (1997-01), P60 (1997-99), and T60 (2003-05).

How is the 18-3465 different from the Sierra 18-3466? The 18-3465 is the same core kit as the Sierra 18-3466 but is supplied without the pump housing, making it suited to jobs where the housing is being reused rather than replaced.

What brand manufactures part number 18-3465? Part number 18-3465 is manufactured by Sierra.

Does the 18-3465 fit the Yamaha 70 HP outboard? Yes, it fits the Yamaha 70 (1997-03) and C70 (2000-01) models.