Mercury impeller key with washer 28-8M0173458 is a genuine Mercury Marine spare part kit for the cooling water pump on selected outboard motors. The key secures the impeller to the drive shaft and transmits the shaft's rotation, allowing the impeller to circulate cooling water through the engine's cooling system. The kit includes an impeller key and a washer.
The spare part is documented for selected carburetor-based Mercury 6-15 hp TwoStroke engines, as well as Mercury 10 hp Magnum, Marathon, and SeaPro and Mercury XR10. It is also used on documented Mariner 6, 8, 9.9, and 15 hp models, as well as Force 9.9 and 15 hp from 1998.
For selected Mercury 10 hp Magnum, Marathon, SeaPro, and XR10 engines, the serial number range 0D038000-0T979999 is documented. Since the application depends on the engine variant and serial number, the spare part number should always be verified against the engine's spare parts catalog before ordering.
Mercury number 28-8M0173458 replaces the previous part numbers 42376, 42376A1, and 42376A2. The barcode is 678633131219.
Key featuresGenuine Mercury Marine spare part
Part number: 28-8M0173458
Includes impeller key and washer
For the cooling water pump impeller
Documented for selected Mercury, Mariner, and Force outboard motors
Replaces 42376, 42376A1, and 42376A2
Always check the engine's serial number and part number before purchase
