Water Pump Impeller for Mercury/Mariner 50–60 HP 2-Stroke and Select 40–60 HP 4-Stroke Outboards – Replaces 47-19453, 47-19453T
Water Pump Impeller for Mercury/Mariner 50–60 HP 2-Stroke and Select 40–60 HP 4-Stroke Outboards – Replaces 47-19453, 47-19453T is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
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Water Pump Impeller for Mercury/Mariner 50–60 HP 2-Stroke and Selec...
Water Pump Impeller for Mercury/Mariner 50–60 HP 2-Stroke and Select 40–60 HP 4-Stroke Outboards – Replaces 47-19453, 47-19453T is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump impeller is designed for specified Mercury and Mariner outboard applications. The company fitment records list Mercury/Mariner 50, 55, and 60 HP 2-stroke engines, as well as select 40–60 HP 4-stroke engines. It is supplied as a single impeller for water-pump service and is not a complete water-pump repair kit.
The impeller is listed as a replacement for Mercury part numbers 47-19453 and 47-19453T. Sierra aftermarket reference 18-8900 is also listed for this impeller family. Confirm the exact engine model, stroke, serial number, and existing impeller dimensions before ordering.
- Aftermarket replacement impeller for specified Mercury and Mariner cooling-system applications.
- High-volume/long-vane impeller profile associated with reference 47-19453T.
- Designed for installation in the water-pump housing after removal of the lower unit.
- Sold as one impeller; the drive key and other water-pump components are not included.
Part Number Matrix
These references are provided for identification and cross-reference purposes. They do not replace verification of the complete engine application.
| Brand or Reference | Part Number | Reference Type |
|---|---|---|
| Mercury | 47-19453 | OEM reference |
| Mercury | 47-19453T | OEM reference |
| Sierra | 18-8900 | Aftermarket cross-reference |
| Additional supplier reference | 9-45301 | Additional cross-reference listed by the supplier |
Engine & Model Compatibility
Fitment information is grouped by stroke because 2-stroke and 4-stroke applications must not be treated as interchangeable without confirming the engine details.
| Brand | Rated HP | Stroke | Model or Application | Year | Serial Number | Notes |
|---|---|---|---|---|---|---|
| Mercury/Mariner | 50 | 2-Stroke | Specified 2-stroke application | Not specified | Verify before ordering | Company fitment record |
| Mercury/Mariner | 55 | 2-Stroke | Specified 2-stroke application | Not specified | Verify before ordering | Company fitment record |
| Mercury/Mariner | 60 | 2-Stroke | Specified 2-stroke application | Not specified | Verify before ordering | Company fitment record |
| Brand | Rated HP | Stroke | Model or Application | Year | Serial Number | Notes |
|---|---|---|---|---|---|---|
| Mercury/Mariner | 40 | 4-Stroke | Carbureted, 3-cylinder | Not specified | Verify before ordering | Company fitment record |
| Mercury/Mariner | 40 | 4-Stroke | 4-cylinder | Not specified | Verify before ordering | Company fitment record |
| Mercury/Mariner | 40 | 4-Stroke | EFI, 4-cylinder | Not specified | Verify before ordering | Company fitment record |
| Mercury/Mariner | 50 | 4-Stroke | EFI, 4-cylinder | Not specified | Verify before ordering | Company fitment record |
| Mercury/Mariner | 60 | 4-Stroke | EFI, 4-cylinder | Not specified | Verify before ordering | Company fitment record |
Do not rely on horsepower alone. Check the engine brand, model designation, stroke, serial-number range, gearcase and water-pump configuration. Catalog references identify 47-19453T as a 3.125-inch outside-diameter by 0.75-inch inside-diameter high-volume/long-vane impeller, but the original impeller should still be measured before installation.
Technical Specs
- Product Type
- Water pump impeller
- Application Type
- Aftermarket replacement for specified Mercury/Mariner outboards
- Impeller Profile
- High-volume/long-vane style
- Outside Diameter
- 3.125 inches reference dimension
- Inside Diameter
- 0.75 inches reference dimension
- Drive Key
- Not included; verify the required key for your engine
- Package Type
- Single impeller
What’s in the Box
- 1 x Water pump impeller
The drive key, water-pump housing, wear plate, gaskets, seals, washers and other repair-kit components are not included.
Installation Notes
- Disconnect the battery and remove the engine cowling as required by the engine manufacturer's service procedure.
- Place the outboard in neutral and support the lower unit safely.
- Remove the fasteners securing the lower unit and carefully separate it from the midsection.
- Remove the water-pump housing cover to access the impeller.
- Remove the old impeller and inspect the drive key, housing, wear plate and related sealing surfaces. Do not assume the required key is included with the impeller.
- Clean the pump components and replace any worn or damaged parts before reassembly.
- Install the correct drive key for the specific engine, then fit the new impeller into the pump housing according to the service manual.
- Reinstall the water-pump housing and lower unit using the manufacturer's torque specifications and approved sealants where specified.
- Reconnect the battery, supply cooling water using appropriate flushing equipment, and confirm a steady tell-tale stream before normal operation.
Troubleshooting & FAQ
How do I know if this impeller fits my specific engine?
Match the engine brand, horsepower, stroke, model, serial number and water-pump configuration to the compatibility information. Also compare the old impeller's outside diameter, inside diameter and vane profile. If any of these details differ, do not install the part without confirming fitment through the appropriate service information.
What are the signs of a failing water-pump impeller?
Common signs include overheating at idle or low speed, a weak or intermittent tell-tale stream, and damaged, brittle or permanently deformed vanes when the impeller is inspected.
How often should I replace my impeller?
Inspect the impeller according to the engine manufacturer's maintenance schedule. Replacement intervals depend on operating hours, storage conditions and exposure to saltwater, sand or silt. Replace it sooner if the vanes are cracked, hardened, worn or permanently bent.
Is this a complete water-pump kit?
No. This listing is for one water-pump impeller only. It does not include the pump housing, wear plate, gaskets, seals, washers or drive key.
Is this an OEM component?
No. This is an aftermarket replacement. Mercury part numbers 47-19453 and 47-19453T, along with Sierra reference 18-8900, are provided only as identification and cross-reference numbers.
Shipping speed & cost
We ship worldwide. Typical transit is 5–15 days; available shipping methods and delivery estimates are shown at checkout.
Warranty & returns
This product is covered by the applicable store warranty and return policy. Contact support with your order details if you receive a damaged or defective item.
Safety & Important Info
- Confirm the engine's brand, model, horsepower, stroke, serial number and water-pump configuration before purchase.
- Compare the replacement impeller with the original part, including diameter and vane profile.
- The drive key is not included. Obtain the correct key separately when required by the engine configuration.
- This is an aftermarket replacement, not an OEM component.
- Follow the engine manufacturer's service manual and use professional installation when appropriate.
About Sea Sierra
- Pro-Grade Standards — We supply marine replacement parts selected for dependable service in real-world applications.
- Fast Global Fulfillment — Free standard delivery is available to most regions; delivery options are shown at checkout.
- Manufacturer-Direct Value — Fair pricing on aftermarket marine parts without unnecessary markups.
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