Sea Water Pump Impeller for Selected MerCruiser Bravo Applications – Replaces 47-59362T1, Sierra 18-3087
Sea Water Pump Impeller for Selected MerCruiser Bravo Applications – Replaces 47-59362T1, Sierra 18-3087 is backordered and will ship as soon as it is back in stock.
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Sea Water Pump Impeller for Selected MerCruiser Bravo Applications ...
Sea Water Pump Impeller for Selected MerCruiser Bravo Applications – Replaces 47-59362T1, Sierra 18-3087 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket sea water pump impeller is intended for selected MerCruiser Bravo and related belt-driven sea water pump applications. It is associated with MerCruiser reference 47-59362T1 and is listed as a replacement for the 47-59362 family. Confirm the pump housing, impeller hub, shaft profile, and original part number before ordering.
Catalog references identify the impeller as Sierra 18-3087 and GLM 89701 for the applicable MerCruiser cooling-system application. These references should be used for comparison only; model, year, engine, serial-number, housing, and hub conditions must match your specific pump.
- Replacement impeller for compatible MerCruiser sea water pump assemblies.
- Designed for a pump with the matching impeller hub and shaft profile.
- Aftermarket component; not an original Mercury Marine part.
- Impeller only unless the selected product packaging specifically states that additional service parts are included.
Part Number Matrix
The following numbers are manufacturer or aftermarket catalog references associated with this impeller family. They are not the internal product SKU.
| Brand | Part Number | Reference Type |
|---|---|---|
| MerCruiser | 47-59362T1 | OEM reference |
| MerCruiser | 47-59362 | OEM reference |
| MerCruiser | 47-59362T | OEM reference |
| Sierra | 18-3087 | Aftermarket reference |
| GLM | 89701 | Aftermarket catalog reference |
Engine & Model Compatibility
Use the original impeller and pump assembly as the primary fitment reference. MerCruiser Bravo application names alone are not sufficient because pump design, housing construction, hub style, engine configuration, and serial-number ranges can vary.
| Brand | Application | Reference | Fitment Conditions |
|---|---|---|---|
| MerCruiser | Selected Bravo I, Bravo II, and Bravo III sea water pump applications | 47-59362T1 | Verify the complete pump assembly, hub profile, housing, engine, and serial number. |
| MerCruiser | Selected MPI Alpha and Bravo applications | 18-3087 / 89701 | Use only where the original impeller and pump configuration match the referenced part family. |
Important: Do not rely on horsepower, engine displacement, or drive model alone. Compare the removed impeller with the replacement and confirm the pump manufacturer’s service information before installation.
Technical Specs
- Product Type
- Sea water pump impeller
- Construction
- Flexible marine pump impeller
- Hub Profile
- Match the impeller hub and shaft profile to the original pump before ordering
- Application
- Selected MerCruiser belt-driven sea water pump assemblies
- Product Status
- Aftermarket replacement component
What’s in the Box
- 1 x Sea water pump impeller
Service parts note: O-rings, gaskets, wear plates, plugs, and pump repair-kit components are not included unless they are expressly identified in the product packaging or order contents. The referenced catalog entries distinguish the impeller from separate repair kits and pump kits.
Installation Notes
- Close the seacock or water intake valve and disconnect the battery before beginning work.
- Identify the correct sea water pump and record hose orientation before removal.
- Remove the pump cover or service plate according to the engine manufacturer’s instructions.
- Carefully remove the old impeller without damaging the housing, cover, shaft, or sealing surfaces.
- Inspect the old impeller for missing blades and remove all fragments from the pump and cooling passages.
- Inspect the housing, wear surfaces, cover, key or drive feature, and seals. Replace damaged or worn service parts as required.
- Compare the replacement impeller with the original for diameter, thickness, blade count, hub, and shaft engagement.
- Lubricate the impeller with a suitable water-compatible lubricant or the lubricant specified by the engine manufacturer. Do not install a dry impeller.
- Install the impeller in the correct direction for engine rotation, refit the cover and seals, and tighten fasteners to the manufacturer’s specification.
- Reconnect the hoses, open the seacock, start the engine, and check immediately for leaks, overheating, and proper cooling-water flow.
Troubleshooting & FAQ
Will this fit every MerCruiser Bravo drive?
No. It is intended for selected Bravo-related sea water pump applications associated with the 47-59362 impeller family. Verify the pump design, housing, hub, engine, and serial-number conditions before ordering.
Are O-rings included?
No O-rings are included in the stated package contents. Separate O-rings, gaskets, wear plates, or repair kits may be required for the particular pump and should be ordered separately when necessary.
What are the signs of a failing impeller?
Common signs include elevated engine temperature, reduced cooling-water flow, overheating at idle or low speed, cracked or stiff blades, and missing pieces found during inspection.
How often should the impeller be replaced?
Inspect the impeller according to the engine manufacturer’s maintenance schedule and replace it whenever it is damaged, hardened, cracked, or missing blades. Frequent saltwater, sand, silt, or extended storage can require more frequent service.
Is this an OEM part?
No. This listing is for an aftermarket replacement impeller. MerCruiser, Mercury Marine, and the other manufacturer names and part numbers are used only to identify application and reference compatibility.
Do I need a complete repair kit?
That depends on the condition and design of your pump. If the housing, wear surfaces, gaskets, seals, or other service parts are damaged or worn, a complete pump repair kit may be more appropriate than an impeller alone.
Safety & Important Information
- Verify the original part number, pump housing, hub profile, dimensions, engine, and serial-number range before purchase.
- Do not operate the engine without an adequate water supply to the sea water pump.
- Replace the impeller immediately if blades are missing and inspect the cooling system for debris.
- Professional installation is recommended when the pump configuration or fitment is uncertain.
About Sea Sierra
- Marine Replacement Parts
- We supply aftermarket marine components for maintenance and repair applications.
- Application-Focused Selection
- Compare the original component and pump configuration carefully before ordering.
- Service Support
- Contact support with the original part number, engine details, pump information, and photographs when fitment assistance is needed.
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