Sierra Water Pump Kit 18-3370, Replaces Yamaha 692-W0078-00-00, Without Housing

The Sierra 18-3370 Water Pump Kit is a replacement service kit for rebuilding your outboard's water pump, supplied without the pump housing. The kit is built from aluminum and plastic components and includes the gaskets and impeller needed to restore proper cooling system operation during a water pump rebuild. It is designed as a direct cross-reference to Yamaha water pump repair kits, making it a straightforward replacement when servicing the lower unit cooling assembly.

This kit is the same as Sierra 18-3371 but does not include the water pump housing, so it is intended for applications where the existing housing is being reused and only the internal wear components need replacement. Included in the kit are the 18-0239 water pump gasket (replacing O.E. 688-44315-A0-00), the 18-0240 water pump gasket (replacing O.E. 688-44316-A0-00), and the 18-3070 impeller, along with the impeller key and O-ring needed for a complete rebuild. Replacing these components at the recommended service interval helps prevent impeller wear from causing loss of water flow and overheating.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3370
• Product Type: Water Pump Kit
• Configuration: Without Housing
• Material: Aluminum, Plastic
• Weight: 0.63 pounds
• UPC: 030999753519
• Kit Contents: 18-0239 Water Pump Gasket, 18-0240 Water Pump Gasket, 18-3070 Impeller

Fitment

This kit is a cross-reference replacement for Yamaha water pump repair kits bearing part numbers 692-W0078-00-00, 692-W0078-01-00, and 692-W0078-A0-00.

Replaces (OEM)

• 692-W0078-00-00
• 692-W0078-01-00
• 692-W0078-A0-00

Frequently Asked Questions

What does the Sierra 18-3370 water pump kit include? The kit includes the 18-0239 water pump gasket, the 18-0240 water pump gasket, and the 18-3070 impeller, without a water pump housing.

Does the 18-3370 kit come with a water pump housing? No. The 18-3370 is the same kit as Sierra 18-3371 but does not contain the water pump housing, so the existing housing must be reused.

What OEM part numbers does the Sierra 18-3370 replace? It replaces Yamaha part numbers 692-W0078-00-00, 692-W0078-01-00, and 692-W0078-A0-00.

What is the 18-0239 gasket used for in this kit? The 18-0239 water pump gasket in the 18-3370 kit replaces O.E. Number 688-44315-A0-00 and is used to seal the water pump during assembly.

What is the 18-0240 gasket used for in this kit? The 18-0240 water pump gasket in the 18-3370 kit replaces O.E. Number 688-44316-A0-00 and is the second sealing gasket included in the rebuild kit.

What material is the Sierra 18-3370 kit made from? The components in the 18-3370 kit are made from aluminum and plastic.

How much does the Sierra 18-3370 water pump kit weigh? The 18-3370 kit weighs 0.63 pounds.

Is the Sierra 18-3370 a genuine Sierra part or aftermarket? The 18-3370 is a Sierra-branded water pump repair kit manufactured as a cross-reference replacement for the listed Yamaha OEM part numbers.

What is the difference between Sierra 18-3370 and 18-3371? The 18-3370 kit is identical to the 18-3371 kit except that 18-3370 does not include the water pump housing.

What is the UPC for the Sierra 18-3370 water pump kit? The UPC for the Sierra 18-3370 water pump kit is 030999753519.