Sierra 18-3314 Water Pump Kit with Housing (Replaces OEM 46-96148A1) for Mercury/Mariner Outboard Engines

The Sierra 18-3314 Water Pump Kit with Housing is a complete cooling-system rebuild kit designed for use with Mercury/Mariner outboard engines. Rather than sourcing individual gaskets, seals, and wear parts separately, this kit bundles everything needed to restore an outboard's water pump in a single package, including the pump housing itself, the impeller, and the water tube guide, along with the full set of gaskets, O-rings, drain screw gaskets, and a seal ring required for a complete reassembly. This makes it well suited for a full water pump overhaul rather than a quick impeller-only swap.

At the core of the kit, the impeller is the wear component that drives raw-water flow to cool the engine, and it is paired here with a new housing and water tube guide so that the pump body, the impeller, and the guide are all renewed together rather than mixing a new impeller with a worn housing. The included O-rings and gaskets seal the pump housing, base, and drain screws to prevent leaks and water intrusion after reassembly. Each Sierra component is built to meet or exceed the original equipment part it replaces, giving a direct-fit replacement for the Mercury/Mariner outboard water pump assembly.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3314
• Product Type: Water Pump Kit
• Compatible Engine Brand: Mercury/Mariner outboard engines
• Kit Includes: Water Pump Housing, Impeller, Water Tube Guide, Water Pump Housing Bushing, Impeller Plate, Water Pump Base, gaskets, O-rings, seal ring, and drain screw gaskets
• Housing OEM Cross Reference: 46-96148A1
• Impeller OEM Cross Reference: 47-89984
• Water Tube Guide OEM Cross Reference: 23-29804
• UPC: 030999315786
• Weight: 0.04 pounds

Fitment

• Mercury/Mariner outboard engines

Replaces (OEM)

• 23-29804 (Water Tube Guide)
• 47-89984 (Impeller)
• 46-96148A1 (Housing)

Frequently Asked Questions

What engines does the Sierra 18-3314 Water Pump Kit fit? The 18-3314 kit is designed for use with Mercury/Mariner outboard engines.

What is included in the Sierra 18-3314 kit? The kit includes the water pump housing, impeller, and water tube guide, plus the water pump housing bushing, impeller plate, water pump base, and the gaskets, O-rings, seal ring, and drain screw gaskets needed for a complete water pump reassembly.

Does this kit include the housing, or just the impeller? Yes, the housing is included: the 18-3314 kit is the version of Sierra's water pump kit that adds the pump housing along with the impeller and water tube guide, rather than only the impeller.

What OEM numbers does the Sierra 18-3314 kit cross-reference? The kit's components cross-reference OEM 46-96148A1 for the housing, OEM 47-89984 for the impeller, and OEM 23-29804 for the water tube guide.

Is the Sierra 18-3314 the same as an aftermarket GLM or Mallory kit? It is interchangeable with GLM 12140 and Mallory 9-48309 kits, so any of those part numbers can be used to identify the equivalent kit for a Mercury/Mariner outboard water pump.

Is this a genuine Sierra part or an aftermarket copy? This is a genuine Sierra 18-3314 Water Pump Kit, manufactured to meet or exceed the original equipment part it replaces.

How much does the Sierra 18-3314 kit weigh? The complete 18-3314 Water Pump Kit weighs 0.04 pounds.

Can I use this kit to replace just a worn impeller? Yes, the 18-3314 kit includes a new impeller along with the housing and water tube guide, so it can be used to replace a worn impeller as part of a full water pump rebuild rather than a single-part swap.

Do I need additional gaskets to install the Sierra 18-3314 kit? No additional gaskets should be needed: the 18-3314 kit already contains the full set of gaskets, O-rings, drain screw gaskets, and a seal ring required to reassemble the water pump.

What is the UPC for the Sierra 18-3314 Water Pump Kit? The UPC for the Sierra 18-3314 Water Pump Kit with Housing is 030999315786.