Aftermarket Water Pump Impeller Kit with Key for Select Mercury/Mariner, Force & Chrysler Outboards – Replaces 47-8508910, 47-850893, 47-8M0027792

Product Details

This aftermarket water pump impeller kit is designed for select Mercury and Mariner outboard motors, as well as select Force and Chrysler models. The documented applications include 2-stroke and 4-stroke outboards ranging from 18 HP through 75 HP, subject to the model, year, gear ratio, and serial-number conditions listed below. Replacing a worn or damaged impeller helps maintain proper water circulation through the engine cooling system.

The impeller is offered as a kit with one impeller and one impeller key. It is listed as a replacement reference for Mercury Marine part numbers 47-85089-1, 47-85089-3, 47-85089-10, 47-85089-20, 47-8508910, 47-850893, 47-8M0024502, and 47-8M0027792, along with selected aftermarket references shown in the part-number matrix.

• Installation: Direct replacement for applications using the listed impeller specification; no modification is intended.
• Material: Neoprene rubber impeller with a metal-alloy hub.
• Kit contents: One water pump impeller and one impeller key.
• Fitment verification: Match the complete engine model, stroke, year or serial range, and gear-ratio notes before ordering.

Part Number Matrix

Use these references to compare the replacement with the number shown on your original part or in your engine parts catalog. Part-number correspondence does not replace verification of the complete engine application.

Engine and Model Compatibility

Confirm the engine model, stroke, year or serial range, and any ratio note in the applicable table. Similar horsepower ratings can use different water-pump components, so horsepower alone is not sufficient for fitment.

This kit also covers the following select Force and Chrysler applications:

Technical Specifications

Product Type

Water pump impeller kit

Installation

Direct replacement

Material

Neoprene rubber with metal-alloy hub

Number of Blades

6

Impeller Height

12.6 mm (0.50 in)

Overall Diameter

73.8 mm (2.91 in)

Hub Shaft Diameter

16.0 mm (0.63 in)

Weight

40 g (1.41 oz)

Housing Color

Black

Included Key

Impeller key 28-85119

What Is Included

• 1 x Water pump impeller
• 1 x Impeller key, 28-85119

Installation Notes

1. Disconnect the battery and remove the spark plug wires before beginning work.
2. Drain the gear lubricant from the lower unit.
3. Remove the bolts securing the lower unit to the engine midsection.
4. Separate the lower unit carefully and disconnect any speedometer tube or shift linkage that is attached.
5. Locate and remove the water-pump housing cover.
6. Note the installed direction of the old impeller blades before removal.
7. Remove the old impeller and impeller key from the driveshaft.
8. Clean the pump housing, wear plate, and mating surfaces.
9. Install the supplied key into the driveshaft slot.
10. Install the new impeller while turning the driveshaft in the direction required to position the blades correctly.
11. Reassemble the pump housing with new gaskets or seals where required, and torque fasteners according to the engine manufacturer specifications.
12. Reinstall the lower unit, refill the gearcase with the correct lubricant, and check the cooling-water stream during the initial test.

Troubleshooting and FAQ

Safety and Important Information

• Verify the model, stroke, year or serial range, and original-part dimensions before purchase.
• Do not operate an outboard without adequate cooling-water supply during testing.
• Improper lower-unit, shift-linkage, water-pump, or gasket installation can cause overheating or engine damage.
• This is an aftermarket replacement, not an OEM component. Brand names and part numbers are used for reference purposes only.
• Professional installation is recommended when the required service procedures or torque specifications are unfamiliar.

About Sea Sierra

• Pro-Grade Standards — We supply marine replacement parts designed for demanding real-world operating conditions.
• Global Fulfillment — Delivery options and estimated transit times are shown at checkout based on destination and service availability.
• Manufacturer-Direct Value — We work with manufacturing partners to provide replacement components at competitive prices.