Engineered Marine Products Water Pump Impeller 47-00001 - Replaces Mercury 18-3017 for MR/Alpha One Stern Drives

The Engineered Marine Products 47-00001 is a water pump impeller built as a direct replacement for Mercury Marine part 18-3017, used in MR and Alpha One stern drive units. The impeller is a core wear component of the drive's cooling system, drawing raw water through the lower unit and circulating it to cool the engine; a worn or cracked impeller is one of the most common causes of overheating on I/O-powered boats, so replacing it at the manufacturer's recommended interval (or any time the pump housing is opened) helps protect the engine from heat damage.

This impeller has a machined construction and measures 8 x 5 x 0.5 inches, weighing 0.224 pounds. It is manufactured by Engineered Marine Products, a company that has supplied both OEM and aftermarket marine customers for over 40 years, engineering and sourcing parts to meet original equipment standards at a competitive price. The 47-00001 corresponds to Mercury Marine part number 18-3017 and is intended for MR/Alpha One stern drive units within the applicable serial number ranges, including units without a flush screw in the gear housing.

Specifications

• Brand: Engineered Marine Products
• Manufacturer Part Number: 47-00001
• Replaces (OEM): 18-3017
• UPC: 840080479446
• Weight: 0.224 pounds
• Product Dimensions: 8 x 5 x 0.5 inches
• Exterior/Finish: Machined
• Compatible Units: Mercury Mercruiser MR / Alpha One stern drives
• Applicable Serial Number Ranges: 2495186-2763441; 2763442-6854392 (units without a flush screw in the gear housing); 6854393-0D594568

Fitment

• Mercury Mercruiser MR/Alpha One stern drive units, serial numbers 2495186 through 2763441
• Mercury Mercruiser MR/Alpha One units without a flush screw in the gear housing, serial numbers 2763442 through 6854392
• Mercury Mercruiser MR/Alpha I units, serial numbers 6854393 through 0D594568

Replaces (OEM)

• 18-3017

Frequently Asked Questions

What does the Engineered Marine Products 47-00001 impeller fit? The 47-00001 fits Mercury Mercruiser MR and Alpha One stern drive units within specific serial number ranges: 2495186 through 2763441, 2763442 through 6854392 (units without a flush screw in the gear housing), and 6854393 through 0D594568.

Is 47-00001 a direct replacement for Mercury 18-3017? Yes, the Engineered Marine Products 47-00001 impeller is built to replace Mercury Marine part number 18-3017.

What are the dimensions of this impeller? The 47-00001 impeller measures 8 x 5 x 0.5 inches.

How much does the 47-00001 impeller weigh? It weighs 0.224 pounds.

How do I know if my drive uses this impeller? Check your Mercury Mercruiser drive's serial number against the applicable ranges for the 47-00001: 2495186-2763441, 2763442-6854392 (no flush screw in gear housing), or 6854393-0D594568 for MR/Alpha I units.

Does this impeller fit units without a flush screw in the gear housing? Yes, units without a flush screw in the gear housing that fall in the serial number range 2763442 through 6854392 use the 47-00001 impeller.

Who makes the 47-00001 impeller? The 47-00001 impeller is manufactured by Engineered Marine Products, a company that has supplied OEM and marine aftermarket parts for over 40 years.

Is this a genuine Mercury part or an aftermarket replacement? The 47-00001 is an aftermarket impeller manufactured by Engineered Marine Products as a replacement for Mercury part 18-3017, not a Mercury-branded part.

What finish does the 47-00001 impeller have? The impeller has a machined exterior finish.

What is the UPC for the 47-00001 impeller? The UPC for the Engineered Marine Products 47-00001 impeller is 840080479446.

Will the 47-00001 fit an Alpha One Generation II drive? No, the 47-00001 (replacing Mercury 18-3017) is listed for MR/Alpha One units in the 2495186-0D594568 serial number ranges; Alpha One Generation II and Vazer units use a different part number.

What is in the box with the 47-00001 impeller? The Engineered Marine Products 47-00001 ships as the impeller itself for the water pump assembly.