Sierra Water Pump Kit 18-3689 for Mercury Outboard Engines

The Sierra Water Pump Kit 18-3689 is a complete water pump repair kit built for Mercury outboard engines. It is designed to restore proper cooling system performance where the factory water pump has worn out, providing the components needed to bring raw water cooling flow back to specification. As a single-count kit, it includes the water pump components required for one complete pump service, making it a straightforward option for routine maintenance or repair work on Mercury outboard cooling systems.

Cooling system failure is one of the most common causes of overheating and engine damage in outboard motors, and the water pump is a wear item that should be inspected and serviced on a regular maintenance schedule. This kit is offered under Sierra's Classic product style and is backed by a 90 day manufacturer warranty, giving buyers confidence in fit and function for the specified application.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3689
• Category: Mercury Outboard Water Pumps and Impellers
• Product Type: Water Pump Kit
• Number of Items: 1
• Unit Count: 1.0 Count
• Product Style: Classic
• Weight: 2.3 pounds
• UPC: 808282386207
• Manufacturer Warranty: 90 days

Frequently Asked Questions

What is the Sierra 18-3689 water pump kit used for? Sierra part 18-3689 is a water pump kit used to service the raw water cooling pump on Mercury outboard engines, restoring proper cooling flow when the original pump wears out.

How many water pumps does this kit service? The 18-3689 kit is packaged as a single count item, containing the components needed for one complete water pump service.

How much does the Sierra 18-3689 water pump kit weigh? This kit weighs 2.3 pounds.

Is the Sierra 18-3689 a genuine Sierra part? Yes, part number 18-3689 is manufactured by Sierra and sold under the Sierra brand as part of its Classic product style.

What warranty comes with the 18-3689 water pump kit? Sierra backs the 18-3689 water pump kit with a 90 day manufacturer warranty.

What engines is the 18-3689 water pump kit designed for? The 18-3689 kit falls under Sierra's Mercury outboard water pumps and impellers category, and is designed for servicing the cooling pump on Mercury outboard engines.

What is the UPC for the Sierra 18-3689 kit? The UPC for the Sierra Water Pump Kit 18-3689 is 808282386207.

Does the 18-3689 kit include the impeller? The 18-3689 is sold as a complete water pump kit, with the included components listed as the water pump kit itself, containing what is needed for a single pump service.

Why would I need to replace my outboard's water pump kit? Water pump components wear out over time and can cause reduced cooling flow or overheating, which is why Sierra offers the 18-3689 kit for periodic replacement on Mercury outboard engines.

Is 18-3689 an OEM part number or an aftermarket replacement number? 18-3689 is Sierra's own manufacturer part number for this water pump kit, sold as a Sierra branded product rather than as an OEM Mercury part.