Water Pump Impeller – Fits Mercury/Mariner 40-60 HP 4-Stroke (Replaces Mercury 47-19453, 47-19453T, Sierra 18-8900)
Water Pump Impeller – Fits Mercury/Mariner 40-60 HP 4-Stroke (Replaces Mercury 47-19453, 47-19453T, Sierra 18-8900) 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 – Fits Mercury/Mariner 40-60 HP 4-Stroke (Repla...
Water Pump Impeller – Fits Mercury/Mariner 40-60 HP 4-Stroke (Replaces Mercury 47-19453, 47-19453T, Sierra 18-8900) is backordered and will ship as soon as it is back in stock.
Product Details
This high-quality Water Pump Impeller – Fits Mercury/Mariner 40-60 HP 4-Stroke Outboards (Replaces 47-19453T) provides a reliable solution for maintaining your engine's cooling system. It is designed specifically for Mercury/Mariner 40, 50, and 60 HP 4-Stroke EFI outboard engines from 1999 and newer, including all BigFoot models. It also serves as a replacement for select Force 70 and 75 HP outboards.
This component is a direct cross-reference for Mercury parts 47-19453 and 47-19453T, and Sierra aftermarket part 18-8900, ensuring precise fitment and function.
- Engineered for direct OEM replacement, simplifying installation.
- Features a durable 6-blade design made from robust rubber.
- Designed with a key-driven shaft hub for secure operation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 47-19453 |
| Mercury | 47-19453T |
| Sierra | 18-8900 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury and Mariner applications, this impeller fits 40-60 HP FourStroke EFI models manufactured from 1999 onwards, including the larger gearcase BigFoot variants.
For Force applications, it is critical to verify your engine's serial number against the ranges listed in the table to guarantee correct fitment.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | FourStroke EFI | 40 | 4-Stroke | 1999 and up | 47-19453T | 3-cylinder engines |
| Mercury | FourStroke EFI | 50 | 4-Stroke | 1999 and up | 47-19453T | 4-cylinder engines |
| Mercury | FourStroke EFI | 60 | 4-Stroke | 1999 and up | 47-19453T | 4-cylinder engines |
| Mercury | FourStroke EFI BigFoot | 40 | 4-Stroke | 1999 and up | 47-19453T | |
| Mercury | FourStroke EFI BigFoot | 50 | 4-Stroke | 1999 and up | 47-19453T | |
| Mercury | FourStroke EFI BigFoot | 60 | 4-Stroke | 1999 and up | 47-19453T |
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Force | Outboard | 70 | 2-Stroke | 1991–1995 | 47-19453T | Serial #0E000001 - 0E138599 |
| Force | Outboard | 75 | 2-Stroke | 1996 | 47-19453T | Serial #0E138600 - 0E202999 |
| Force | Outboard | 75 | 2-Stroke | 1997 | 47-19453T | Serial #0E203000 - 0E287999 |
| Force | Outboard | 75 | 2-Stroke | 1998 | 47-19453T | Serial #0E288000 - 0E344999 |
Technical Specs
- Product Type
- Water Pump Impeller
- Installation
- Direct OEM Replacement
- Number of Blades
- 6
- Housing Material
- Rubber (Impeller)
- Outer Diameter
- 78.31mm
- Height
- 24.60mm
- Inner Hub Diameter
- 19.20mm
- Shaft Design
- Key-driven
What’s in the Box
- 1 x Water Pump Impeller (Replaces 47-19453T)
Installation Notes
- Disconnect the negative battery cable and remove the engine cowling.
- Shift the outboard into the neutral gear position.
- Remove the bolts securing the lower unit (gearcase) and carefully separate it from the upper housing.
- Unbolt and remove the water pump housing cover to access the impeller.
- Slide the old impeller off the driveshaft, being sure to remove the small drive key.
- Clean the interior of the pump housing and inspect the wear plate for scoring or damage.
- Insert the new drive key into the shaft and slide the new impeller on. Rotate the driveshaft clockwise to help seat the blades correctly inside the housing.
- Reinstall the water pump housing, applying a non-permanent sealant to the bolt threads and tightening to the manufacturer's torque specification.
- Reattach the lower unit, ensuring the driveshaft, shift shaft, and water tube are properly aligned.
- Reconnect the battery, supply water to the engine using flushing muffs, and start it to confirm a steady stream of water from the tell-tale outlet.
Troubleshooting & FAQ
How do I know if this impeller fits my specific engine?
First, check our compatibility tables for your engine's brand, model, horsepower, and year. For Force engines, it is essential that you also verify your engine's serial number falls within the range specified in the notes. Comparing the dimensions and photos to your old part is always a reliable final check.
What are the signs of a failing water pump impeller?
The most common signs include the engine overheating at idle or low speeds, a weak or intermittent water stream from the tell-tale (water discharge) outlet, or a high-pitched whining sound from the lower unit. Upon inspection, a worn impeller will often have brittle, cracked, or permanently bent blades.
How often should I replace my impeller?
As a best practice for preventative maintenance, we recommend inspecting the impeller annually and replacing it every 1 to 2 years, or every 100-200 hours of operation. Replacement frequency should be increased if you operate primarily in saltwater or in water with high levels of sand or silt.
Is this a complete water pump kit?
No, this product listing is for the water pump impeller only. It does not include the pump housing, wear plate, gaskets, or seals. These components may be sold separately or as part of a complete water pump repair kit.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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