Sierra 18-3324 Water Pump Kit, Replaces Mercury Marine 46-77177A3, for Mercury/Mariner Outboard

The Sierra 18-3324 Water Pump Kit is a complete pump housing rebuild kit for Mercury/Mariner outboards, built as a replacement for Mercury Marine part number 46-77177A3. Rather than sourcing each wear component separately, this kit bundles the impeller, upper pump housing, water pump base, and all the gaskets, seals, and hardware needed to fully rebuild the outboard's water pump section in one job. At the core of the kit is the impeller (O.E. 47-89983), which drives raw water through the cooling system, paired with the upper pump housing (O.E. 46-77822A1) and water pump base (O.E. 46-77177A1) that the impeller seats and rotates within. Rounding out the kit are drain gaskets, a lower water pump base, face plate gaskets, water pump base gaskets, a drain plug, a plate, and three O-rings, so a technician has every wear part on hand for a single teardown rather than reordering mid-job when a gasket or O-ring turns out to be missing. This makes the 18-3324 kit suited to a full water pump service rather than a single-impeller swap. The kit ships as one packaged unit and is manufactured with a country of origin of China.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3324
• Replaces (OEM): 46-77177A3
• Compatibility: Mercury/Mariner Outboard
• Weight: 0.52 pounds
• Country of Origin: China
• UPC: 030999315861
• Impeller Part Number: 47-89983
• Upper Pump Housing Part Number: 46-77822A1
• Water Pump Base Part Number: 46-77177A1
• Kit Includes: Impeller, upper pump housing, water pump base, drain gaskets, lower water pump base, face plate gasket, upper face plate to body gasket, water pump base gaskets, drain plug, plate, and O-rings

Fitment

The Sierra 18-3324 Water Pump Kit is a replacement for the Mercury/Mariner Outboard water pump assembly identified by Mercury Marine part number 46-77177A3.

Replaces (OEM)

• 46-77177A3

Frequently Asked Questions

What does the Sierra 18-3324 Water Pump Kit replace? It replaces Mercury Marine part number 46-77177A3, the OEM water pump housing kit for Mercury/Mariner outboards.

Is this a full water pump rebuild kit or just an impeller? The 18-3324 is a full rebuild kit, not a single impeller. It includes the impeller (O.E. 47-89983), the upper pump housing (O.E. 46-77822A1), the water pump base (O.E. 46-77177A1), plus drain gaskets, a lower water pump base, face plate gaskets, water pump base gaskets, a drain plug, a plate, and O-rings.

What is included in the box with the 18-3324 kit? The kit contains the impeller, upper pump housing, water pump base, drain gaskets, a lower water pump base, a face plate gasket, an upper face plate to body gasket, water pump base gaskets, a drain plug, a plate, and O-rings, giving a full set of parts for one water pump service.

What is the part number for the impeller in this kit? The impeller included in the Sierra 18-3324 kit corresponds to O.E. Part number 47-89983.

How much does the Sierra 18-3324 Water Pump Kit weigh? The kit weighs 0.52 pounds.

What outboards does the 18-3324 kit fit? It is built as a replacement water pump kit for Mercury/Mariner outboards that use the 46-77177A3 pump housing assembly.

Does the kit include the water pump base and housing, or only gaskets? It includes the structural components as well: the upper pump housing (46-77822A1) and water pump base (46-77177A1) are both part of the Sierra 18-3324 kit, along with the gaskets and O-rings needed to install them.

Where is the Sierra 18-3324 Water Pump Kit manufactured? The kit's country of origin is China.

Does the 18-3324 kit include a drain plug and gaskets? Yes, the kit includes a drain plug (O.E. 12-49221-1) along with drain gaskets and multiple water pump base gaskets.

What is the UPC for the Sierra 18-3324 Water Pump Kit? The UPC for this kit is 030999315861.

Do I need to buy the impeller separately if I order the 18-3324 kit? No, the impeller is already included in the Sierra 18-3324 kit, so no separate impeller purchase is needed for the rebuild.