Sierra 18-3323 Water Pump Kit for Mercury/Mariner Outboard - Replaces 46-73640A2

The Sierra 18-3323 Water Pump Kit is a complete cooling system rebuild kit for Mercury/Mariner outboard motors. Rather than replacing individual worn components one at a time, this kit bundles the three parts that typically fail together as a water pump wears out, so the entire pump assembly can be renewed in a single job. It is built to meet or exceed original equipment quality, giving the outboard's cooling system reliable performance after installation.

Inside the kit you get an impeller, an upper pump housing, and a water pump base, each matched to the original equipment part numbers used on the applicable Mercury/Mariner outboard water pump assembly. Because the impeller, housing, and base are packaged together, the parts are matched to work as a set rather than requiring the buyer to source and cross-check each component individually. The kit directly replaces Mercury/Mariner OEM part number 46-73640A2, making it a straightforward like-for-like service part for a failing or worn outboard water pump.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3323
• Product Type: Water Pump Kit
• Application: Mercury/Mariner Outboard
• Weight: 0.51 pounds
• Kit Contents: Impeller (18-3007, O.E. 47-89983); Upper Pump Housing (18-3118, O.E. 46-77822A1); Water Pump Base (18-3423, O.E. 46-73640A1)
• UPC: 030999315854
• OEM Cross Reference: 46-73640A2

Fitment

• Mercury/Mariner outboard motors using water pump assembly OEM 46-73640A2

Replaces (OEM)

• 46-73640A2

Frequently Asked Questions

What does the Sierra 18-3323 water pump kit include? The kit includes three parts: an impeller (Sierra 18-3007, O.E. 47-89983), an upper pump housing (Sierra 18-3118, O.E. 46-77822A1), and a water pump base (Sierra 18-3423, O.E. 46-73640A1).

What outboard motors does the 18-3323 water pump kit fit? This kit is designed for Mercury/Mariner outboard motors that use the water pump assembly corresponding to OEM part number 46-73640A2.

Which OEM part number does the Sierra 18-3323 replace? It directly replaces Mercury/Mariner OEM part number 46-73640A2.

Is the Sierra 18-3323 a genuine Mercury part? No, it is an aftermarket kit made by Sierra that is built to meet or exceed original equipment quality and serves as a direct replacement for Mercury/Mariner OEM 46-73640A2.

How much does the 18-3323 water pump kit weigh? The complete kit weighs 0.51 pounds.

Do I need to buy the impeller separately with this kit? No, the impeller is already included in the Sierra 18-3323 kit along with the upper pump housing and water pump base, so no separate impeller purchase is needed.

Can I buy the individual components of the 18-3323 kit separately? The kit is made up of three individually numbered Sierra parts, the 18-3007 impeller, the 18-3118 upper pump housing, and the 18-3423 water pump base, which are bundled together as kit 18-3323.

Why replace the entire water pump kit instead of just the impeller? The 18-3323 kit bundles the impeller with the upper pump housing and water pump base because these components wear together on a Mercury/Mariner outboard, so replacing them as a set restores the full pump assembly rather than just one wear part.

What is the UPC for the Sierra 18-3323 water pump kit? The UPC for this Mercury/Mariner outboard water pump kit is 030999315854.

Is installation of the 18-3323 kit a DIY job? The kit provides the impeller, upper pump housing, and water pump base needed to service a Mercury/Mariner outboard's water pump assembly as part of a routine cooling system repair or maintenance job.