Sierra 18-3007 Impeller, Replaces Mercury Marine 47-89983T2, Fits 30-70 HP Outboards

The Sierra 18-3007 is a replacement water pump impeller engineered for the cooling system of Mercury Marine outboard engines. The impeller is the rotating component inside the outboard's water pump housing that draws raw water from the lake or sea and circulates it through the engine block to keep operating temperatures in check. A worn, cracked, or melted impeller is one of the most common causes of outboard overheating, and replacing it on a routine schedule protects the powerhead from heat damage.

This impeller is built from black aluminum with flexible vanes designed to maintain consistent water flow at idle through wide-open throttle. It is designed as a direct fit for the Mercury Marine 47-89983 water pump impeller, giving boat owners a straightforward drop-in replacement during a scheduled water pump service or full water pump kit rebuild. The part is intended for outboard applications rated up to 70 horsepower with 4-stroke engines using a transom-mounted water pump and running on gasoline.

Each unit ships as a single impeller (quantity of 1) for use in the lower unit water pump assembly. Sierra backs the part with its standard limited warranty against manufacturing defects.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3007
• Product Type: Impeller
• Material: Aluminum
• Color: Black
• Engine Type: 4 Stroke
• Mounting Type: Transom Mount
• Fuel Type: Gasoline
• Maximum Horsepower: 70 Horsepower
• Recommended Use: Cooling the outboard motor
• Weight: 0.1 pounds
• Quantity: 1
• UPC: 030999315021
• OEM Cross Reference: 47-89983T2, 47-89983Q1, 47-89983

Fitment

• 4-stroke outboards up to 70 horsepower with a transom-mounted water pump

Replaces (OEM)

• 47-89983T2
• 47-89983Q1
• 47-89983

Frequently Asked Questions

What does the Sierra 18-3007 impeller replace? The Sierra 18-3007 impeller replaces Mercury Marine OEM numbers 47-89983T2, 47-89983Q1, and 47-89983, so it is a direct swap wherever those part numbers are called for.

What horsepower range is the 18-3007 impeller designed for? This impeller is designed for 4-stroke outboard engines rated up to 70 horsepower that use a transom-mounted, gasoline-fueled water pump.

How many impellers come in the package? One Sierra 18-3007 impeller is included per package; it is sold as a single unit rather than as part of a full water pump kit.

What material is the Sierra 18-3007 impeller made from? The 18-3007 is made from black aluminum, matching the construction of the Mercury Marine impeller it replaces.

How much does the Sierra 18-3007 impeller weigh? The impeller weighs 0.1 pounds.

Is the Sierra 18-3007 a genuine Mercury Marine part or an aftermarket replacement? The 18-3007 is a Sierra-brand aftermarket impeller manufactured as a direct equivalent to Mercury Marine part 47-89983, not an OEM Mercury Marine part.

When should I replace the water pump impeller on my outboard? A water pump impeller like the Sierra 18-3007 should be replaced on a routine maintenance schedule or immediately if the outboard is overheating, since worn or cracked vanes reduce raw water flow to the cooling system.

Does the Sierra 18-3007 impeller include gaskets for the water pump housing? No, the 18-3007 package contains only the impeller itself; water pump housing gaskets are separate parts.

What is the UPC for the Sierra 18-3007 impeller? The Sierra 18-3007 impeller carries UPC 030999315021.

Is the Sierra 18-3007 impeller covered by a warranty? Yes, the 18-3007 is covered under Sierra's standard limited warranty against manufacturing defects.

What engine type is the 18-3007 impeller compatible with? It is compatible with 4-stroke gasoline outboard engines using a transom-mounted water pump, up to 70 horsepower.