Water Pump Impeller Kit – Fits MerCruiser Bravo 1/2/3 4.3L-7.4L V8 Engines (Replaces 47-59362T6, 47-59362T1)
Water Pump Impeller Kit – Fits MerCruiser Bravo 1/2/3 4.3L-7.4L V8 Engines (Replaces 47-59362T6, 47-59362T1) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Water Pump Impeller Kit – Fits MerCruiser Bravo 1/2/3 4.3L-7.4L V8 ...
Water Pump Impeller Kit – Fits MerCruiser Bravo 1/2/3 4.3L-7.4L V8 Engines (Replaces 47-59362T6, 47-59362T1) is backordered and will ship as soon as it is back in stock.
Product Details
This Sea Sierra Water Pump Impeller Kit is designed for MerCruiser Bravo 1, 2, and 3 inboard and sterndrive engines (4.3L, 5.0L, 5.7L, 7.4L, and 8.2L V8 models) from 1997 and later that are equipped with a one-piece sea water pump body. It provides a reliable solution for maintaining optimal engine cooling performance.
This kit serves as a direct replacement for multiple OEM and aftermarket parts, including Mercury 47-59362T6, 47-59362T1, and Sierra 18-3087.
- Engineered for a direct fit on units with a one-piece pump body.
- Features a durable neoprene impeller with a hardened nylon hub for longevity.
- Kit includes one impeller, one face plate, and two O-rings for a complete service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 47-59362T6 |
| Mercury | 59362T6 |
| Mercury | 47-59362T1 |
| Mercury | 59362T1 |
| Mercury | 47-59362 |
| Mercury | 59362 |
| Mercury | 47-59362A1 |
| Mercury | 59362A1 |
| Mercury | 47-59362Q01 |
| Mercury | 59362Q01 |
| Sierra | 18-3087 |
| GLM | 89740 |
| Mallory | 9-45375 |
| Jabsco | 17954-0001-P |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser models, this kit fits various V8 inboard and sterndrive engines from 1997 and later, specifically those using a one-piece raw water pump housing.
| Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|
| MerCruiser 260 | 260 | 4-Stroke | 1981–1984 | 47-59362T6 | |
| MerCruiser 340 | 340 | 4-Stroke | 1981–1987 | 47-59362T6 | |
| MerCruiser 350 MAG/MPI/TBI | 300+ | 4-Stroke | Various | 47-59362T6 | |
| MerCruiser 454 MAG/SKI/TBI | 330+ | 4-Stroke | Various | 47-59362T6 | |
| MerCruiser Inboard 4.3L | 190-220 | 4-Stroke | 1997–Later | 47-59362T6 | For engines with one-piece pump body |
| MerCruiser Inboard 5.0L | 220-260 | 4-Stroke | 1997–Later | 47-59362T6 | For engines with one-piece pump body |
| MerCruiser Inboard 5.7L | 250-300 | 4-Stroke | 1997–Later | 47-59362T6 | For engines with one-piece pump body |
| MerCruiser Inboard 7.4L | 310-340 | 4-Stroke | 1997–Later | 47-59362T6 | For engines with one-piece pump body |
| MerCruiser Inboard 8.2L | 375-420 | 4-Stroke | 1997–Later | 47-59362T6 | For engines with one-piece pump body |
| MerCruiser Bravo 1 | Various | 4-Stroke | 1997–Later | 47-59362T6 | For one-piece pump body |
| MerCruiser Bravo 2 | Various | 4-Stroke | 1997–Later | 47-59362T6 | For one-piece pump body |
| MerCruiser Bravo 3 | Various | 4-Stroke | 1997–Later | 47-59362T6 | For one-piece pump body |
| MerCruiser Race 320 efi | 320 | 4-Stroke | Various | 47-59362T6 | |
| MerCruiser Race 377 efi | 377 | 4-Stroke | Various | 47-59362T6 | |
| MerCruiser Race 420-800SC | 420-800 | 4-Stroke | Various | 47-59362T6 | High-performance models |
Technical Specs
- Product Type
- Sea Water Pump Impeller Kit
- Installation
- Replacement for one-piece pump body
- Material
- Neoprene rubber with hardened nylon hub
- Impeller Type
- 8-blade with D-shaped shaft/single flat drive
- Dimensions
- Bore: 0.75 in (19.05 mm), OD: 2.64 in (67.06 mm), Thickness: 2.01 in (51.05 mm)
- Weight
- 90 g (3.2 oz)
- Application
- MerCruiser Bravo 1, 2, 3 Inboard and Sterndrive engines
- Compatible Engine Types
- 4.3L, 5.0L, 5.7L, 7.4L, 8.2L V8
- Housing Compatibility
- One-piece pump body
What’s in the Box
- 1 x Water Pump Impeller
- 1 x Face Plate
- 2 x O-ring
Installation Notes
- Disconnect the battery and close the seacock/sea strainer valve.
- Locate the sea water pump on the engine. Note the hose connections before removal.
- Loosen the clamps and remove the inlet and outlet hoses. Expect some water spillage.
- Unbolt the pump housing from the engine bracket.
- Remove the pump's rear cover or face plate screws to access the impeller.
- Note the rotational direction of the old impeller blades before removing it. Use pliers or an impeller puller if necessary.
- Clean the inside of the pump housing, ensuring the sealing surfaces are free of debris or scoring.
- Lubricate the new O-rings and interior of the housing with a suitable marine lubricant.
- Install the new impeller, bending the blades in the correct rotational direction.
- Reinstall the face plate with its new gasket/O-ring, and tighten screws to the manufacturer’s torque specification.
- Re-mount the pump, reconnect the hoses, and open the seacock valve.
- Start the engine and immediately check for water flow from the exhaust and inspect the pump for any leaks.
Troubleshooting & FAQ
How do I know if this impeller kit fits my engine?
This kit is for MerCruiser V8 engines (1997 and later) that have a one-piece sea water pump body. The key is the pump housing type. Please verify your engine has this specific pump before ordering and cross-reference your existing part number with our list.
What are the signs of a failing water pump impeller?
Common signs include a higher-than-normal engine temperature at idle or low speeds, a weak or non-existent stream of water from the exhaust outlet, and visible cracks, tears, or stiff/brittle blades on the impeller itself during inspection.
How often should the impeller be replaced?
As a preventative maintenance item, it's recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of operation, depending on usage conditions (e.g., saltwater vs. freshwater, high-sand environments).
What can cause premature impeller failure?
The most common causes are running the pump dry (even for a few seconds), sucking up sand or debris which accelerates wear, and long periods of disuse where the blades can become stiff and take a permanent set.
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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