Sea Water Pump Impeller Repair Kit – Fits MerCruiser Bravo, Alpha 1/2/3 (Replaces 47-59362T6)
Sea Water Pump Impeller Repair Kit – Fits MerCruiser Bravo, Alpha 1/2/3 (Replaces 47-59362T6) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Sea Water Pump Impeller Repair Kit – Fits MerCruiser Bravo, Alpha 1...
Product Details
This Sea Water Pump Impeller Repair Kit is designed for a broad range of Mercury MerCruiser inboard and sterndrive engines, including 4.3L, 5.0L, 5.7L, 7.4L, and 8.2L models manufactured from the 1980s through 2003 that are equipped with a one-piece plastic pump body and serpentine belt system.
It serves as a direct replacement for Mercury part numbers 47-59362T6, 47-59362, 47-59362T1, 47-593621, 47-59362A1, 47-59362Q01, and interchanges with Sierra 18-3087, GLM 89740, Mallory 9-45375, and Jabsco 17954-0001-P.
- Engineered for engine-mounted raw water pumps with a one-piece plastic housing.
- Features a durable neoprene impeller with a hardened nylon hub for longevity.
- The complete kit includes the impeller, face plate, and O-rings for a full service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 47-59362T6 |
| Mercury | 47-59362 |
| Mercury | 47-59362T1 |
| Mercury | 47-593621 |
| Mercury | 47-59362A1 |
| Mercury | 47-59362Q01 |
| Sierra | 18-3087 |
| GLM | 89740 |
| Mallory | 9-45375 |
| Jabsco | 17954-0001-P |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This impeller kit fits a wide range of MerCruiser engines from the early 1980s through 2003, specifically those equipped with a one-piece plastic raw water pump housing and serpentine belt system.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury MerCruiser | MerCruiser 260 | 260 | 4-Stroke | 1981–1984 | 47-59362T6 | |
| Mercury MerCruiser | MerCruiser 340 | 340 | 4-Stroke | 1981–1987 | 47-59362T6 | |
| Mercury MerCruiser | MerCruiser 350 MAG/MPI/TBI | 350 | 4-Stroke | Various | 47-59362T6 | |
| Mercury MerCruiser | MerCruiser 454 MAG/SKI/TBI | 454 | 4-Stroke | Various | 47-59362T6 | |
| Mercury MerCruiser | Inboard Engine 4.3L | Various | 4-Stroke | Up to 2003 | 47-59362T6 | Serpentine belt, one-piece housing |
| Mercury MerCruiser | Inboard Engine 5.0L | Various | 4-Stroke | Up to 2003 | 47-59362T6 | Serpentine belt, one-piece housing |
| Mercury MerCruiser | Inboard Engine 5.7L | Various | 4-Stroke | Up to 2003 | 47-59362T6 | Serpentine belt, one-piece housing |
| Mercury MerCruiser | Inboard Engine 7.4L | Various | 4-Stroke | Up to 2003 | 47-59362T6 | Serpentine belt, one-piece housing |
| Mercury MerCruiser | Inboard Engine 8.2L | Various | 4-Stroke | Up to 2003 | 47-59362T6 | Serpentine belt, one-piece housing |
| Mercury MerCruiser | Race Stern Drive 320 efi | 320 | 4-Stroke | Various | 47-59362T6 | |
| Mercury MerCruiser | Race Stern Drive 377 efi | 377 | 4-Stroke | Various | 47-59362T6 | |
| Mercury MerCruiser | Race Stern Drives (420, 425, 450, 465, 500 efi, 525SC, 575, 600SC, 800SC) | Various | 4-Stroke | Various | 47-59362T6 | |
| Mercury MerCruiser | Stern Drive Alpha/Bravo (200/228/230/260/262TBI/300/330/350 MAG/370/372/502MPI/EFI/MC1/MC2) | Various | 4-Stroke | Up to 2003 | 47-59362T6 | One-piece housing, serpentine belt |
Technical Specs
- Product Type
- Sea Water/Raw Water Pump Impeller Repair Kit
- Installation
- Engine-mounted pumps with one-piece plastic body
- Impeller Material
- Neoprene with hardened nylon hub
- Number of Blades
- 8
- Shaft Type
- D-shaped shaft (Single Flat Drive)
- Impeller Thickness
- 2.01 inches (51.05 mm)
- Overall Diameter
- 2.64 inches (67.06 mm)
- Shaft Diameter
- 0.75 inches (19.05 mm)
- Weight
- 0.39 lbs (0.18 kg) / 90g
- Dimensions (L × W × H)
- 4.5 × 2.63 × 4.88 inches (114.3 × 66.8 × 124.0 mm)
What’s in the Box
- 1 x Water Pump Impeller (47-59362T6)
- 1 x Face Plate
- 2 x O-rings
Installation Notes
- Disconnect the boat's battery and close the water inlet seacock.
- Locate the raw water pump housing on the engine.
- Loosen and remove the screws holding the pump cover plate.
- Carefully remove the old impeller using pliers or an impeller puller tool. Note the orientation of the blades for reinstallation.
- Clean the interior of the pump housing and the cover plate, removing any old gasket material or debris.
- Inspect the housing for scoring or cracks; replace the pump if significant wear is found.
- Install the new O-rings or gaskets, ensuring a proper seal.
- Lubricate the new impeller and the inside of the housing with a suitable marine lubricant.
- Insert the new impeller, rotating the shaft in the direction of engine operation to bend the blades correctly.
- Reinstall the cover plate and tighten the screws in a star pattern to ensure even pressure.
- Open the seacock, reconnect the battery, and start the engine.
- Immediately check the pump and hose connections for any water leaks.
Troubleshooting & FAQ
How do I know if this impeller fits my MerCruiser engine?
To confirm fitment, ensure your engine is a model from the 1980s to 2003 and is equipped with the one-piece plastic raw water pump body, which is typically used with a serpentine belt system. Always verify your specific model against the compatibility table provided on this page.
What are the signs of a failing sea water pump impeller?
The most common symptoms of a worn or damaged impeller are engine overheating, especially at idle or low speeds, a weak or non-existent stream of water from the exhaust outlet, and finding rubber fragments in the cooling system. Visible cracks, stiffness, or missing blades on the impeller itself are clear indicators for replacement.
How often should I replace my engine's impeller?
As a crucial part of preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 years or after every 100-200 hours of engine operation. This interval may vary based on usage, water conditions (sandy or silty water causes faster wear), and manufacturer recommendations.
Is this impeller kit compatible with a two-piece bronze pump housing?
No, this particular repair kit is specifically designed for MerCruiser engines that use a one-piece plastic sea water pump body. It will not fit the older-style two-piece bronze pump housings.
What is the difference between an OEM and an aftermarket part?
This listing is for an aftermarket replacement part, not an Original Equipment Manufacturer (OEM) component. It has been engineered to meet or exceed OEM-level specifications using comparable high-quality materials. Our parts are manufactured in an ISO 9002 certified facility and are batch-inspected to ensure consistent quality and performance.
How much is shipping and how fast will it arrive?
We ship worldwide quickly, with typical transit times of 5–15 days for most regions. Standard shipping is free for most orders. Expedited shipping options, if available for your location, will be presented at checkout for an additional fee.
What is the warranty and return policy for this part?
This product is covered by a 1-year warranty against manufacturing defects under normal operating conditions. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard return window, provided the part is unused and in its original packaging. Please see our full policy page or reach out for detailed instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchase. If anything differs—even if your model is listed as compatible—do not purchase.
- This is an aftermarket replacement part, not an OEM component. Brand names and part numbers are used for reference purposes only.
- Professional installation is highly recommended for safety and to ensure optimal performance of your engine's cooling system.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for demanding real-world conditions.
- Fast Global Fulfillment — We offer free standard delivery to most regions, with an average transit time of 5–15 days.
- Manufacturer-Direct Value — By working directly with our manufacturing partners, we provide fair pricing without compromising on materials or quality control.
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