Sierra 18-3052 Neoprene Water Pump Impeller, Replaces 47-89982, Fits Mercury/Mariner 20 HP (Model 200) Outboard

The Sierra 18-3052 is a neoprene water pump impeller built to replace the cooling system impeller on Mercury/Mariner 20 hp (model 200) outboard motors. As the rotating component inside the outboard's water pump housing, the impeller draws raw water through the lower unit and pushes it up to the powerhead to cool the engine block and exhaust; a worn, cracked, or brittle impeller reduces water flow and can allow the engine to run hot, so replacing it on schedule protects against overheating damage.

This impeller is molded from neoprene rubber, a material chosen for its resistance to heat, fuel, and oil exposure inside the water pump housing, and it is built with 6 fins to move water efficiently through the pump body. It carries a white color finish and is sized as a direct fit for the water pump housing used on the applicable Mercury/Mariner outboard. Installing the correct impeller for your specific engine and pump housing is important, since impellers are sized and finned differently across outboard models and horsepower ratings.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3052
• Product Type: Impeller
• Material: Neoprene
• Color: White
• Number of Fins: 6
• Weight: 0.06 pounds
• Quantity: 1 impeller
• UPC: 030999315083

Fitment

• Mercury/Mariner 20 hp (model 200) outboard, 1970-1985

Replaces (OEM)

• 47-89982 (Mercury Marine)

Frequently Asked Questions

What does the Sierra 18-3052 impeller fit? The Sierra 18-3052 is designed for Mercury/Mariner 20 hp (model 200) outboard motors from 1970-1985.

What OEM part number does the 18-3052 replace? This impeller replaces Mercury Marine part number 47-89982.

What material is the 18-3052 impeller made from? Neoprene rubber is used for the Sierra 18-3052, chosen for its resistance to heat, fuel, and oil inside the water pump housing.

How many fins does the 18-3052 impeller have? Six fins are molded into the Sierra 18-3052 to move raw cooling water through the pump housing.

How much does the 18-3052 impeller weigh? The Sierra 18-3052 weighs 0.06 pounds.

What color is the Sierra 18-3052 impeller? It has a white finish, as molded in the neoprene material of the 18-3052.

Is the 18-3052 a genuine Sierra part or aftermarket? The 18-3052 is a Sierra-branded replacement impeller manufactured to replace Mercury Marine 47-89982, sold as an aftermarket equivalent to the OEM part.

How many impellers come in a package of the 18-3052? Each 18-3052 package contains 1 impeller.

Why would I need to replace the impeller on my Mercury 20 hp outboard? A worn, cracked, or hardened impeller reduces raw water flow to the engine, which can cause overheating; the Sierra 18-3052 replaces this wear part on Mercury/Mariner 20 hp (model 200) outboards from 1970-1985.

Will the 18-3052 fit other Mercury outboard horsepower models? The Sierra 18-3052 is specified for the Mercury/Mariner 20 hp (model 200) outboard, 1970-1985; other horsepower models use different impellers.