Sierra Water Pump Repair Kit 18-3474, Without Housing, Replaces 6CB-W0078-00-00, Fits Yamaha VF225, VF250 (2009-18)

The Sierra 18-3474 Water Pump Repair Kit is a without-housing rebuild kit designed to restore cooling system performance on compatible Yamaha outboards. Rather than replacing the entire water pump housing, this kit supplies the wear components that fail first in normal service, letting you refresh the pump at a fraction of the cost of a full housing replacement. It is built for Yamaha VF225 and VF250 outboards (2009-18) and directly replaces OEM part number 6CB-W0078-00-00.

The kit includes a cup insert (Sierra 18-3519, OE equivalent 61A-44322-02) and a water pump gasket (Sierra 18-0451), the two components most commonly worn or damaged during routine water pump service. Installing fresh replacement parts during a rebuild helps maintain proper impeller seating and a tight seal against the pump housing, both of which are important for consistent raw water flow to the engine.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3474
• Product Type: Water Pump Repair Kit
• Housing Included: No (Without Housing)
• Weight: 1.3 pounds
• UPC: 808282376826
• Included Components: Cup Insert (18-3519, OE 61A-44322-02), Water Pump Gasket (18-0451)
• Replaces (OEM): 6CB-W0078-00-00
• Fits: Yamaha VF225, VF250 (2009-18)

Fitment

• Yamaha VF225 (2009-18)
• Yamaha VF250 (2009-18)

Replaces (OEM)

• 6CB-W0078-00-00

Frequently Asked Questions

What does the Sierra 18-3474 water pump repair kit include? The kit includes a cup insert (Sierra 18-3519, OE equivalent 61A-44322-02) and a water pump gasket (Sierra 18-0451). It does not include the water pump housing.

Which outboards does 18-3474 fit? Sierra 18-3474 fits Yamaha VF225 and VF250 outboards (2009-18).

What OEM part number does this kit replace? Sierra 18-3474 replaces OEM number 6CB-W0078-00-00.

Does this kit come with a new water pump housing? No. The 18-3474 kit is a without-housing repair kit, supplying only the cup insert and gasket needed to rebuild the existing housing.

How much does the 18-3474 water pump kit weigh? The Sierra 18-3474 kit weighs 1.3 pounds.

Is the 18-3474 kit an OEM or aftermarket part? It is a Sierra aftermarket repair kit manufactured as a direct replacement for OEM part 6CB-W0078-00-00.

What is the cup insert part number included in this kit? The cup insert included in the 18-3474 kit is Sierra part 18-3519, with OE equivalent 61A-44322-02.

What is the gasket part number included in the 18-3474 kit? Sierra part 18-0451 is the water pump gasket included in the 18-3474 repair kit.

Can I use this kit if I already have a good water pump housing? Yes. Since Sierra 18-3474 is sold without housing, it is intended for rebuilding an existing housing that is still in usable condition.

What is the UPC for Sierra 18-3474? The UPC for the Sierra 18-3474 water pump repair kit is 808282376826.