Outboard Impeller – Fits OMC BRP Cobra (Replaces 987176, 3854072, 18-30585)
Outboard Impeller – Fits OMC BRP Cobra (Replaces 987176, 3854072, 18-30585) 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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Outboard Impeller – Fits OMC BRP Cobra (Replaces 987176, 3854072, 1...
Outboard Impeller – Fits OMC BRP Cobra (Replaces 987176, 3854072, 18-30585) is backordered and will ship as soon as it is back in stock.
Product Details
This Outboard Impeller is engineered for OMC BRP Cobra King all Models boat engines, delivering reliable water pump performance across the full range of compatible applications. Designed as a direct-fit replacement, this impeller ensures consistent cooling flow to protect your engine from overheating.
This part directly replaces OEM numbers 987176, 3854072, and 18-30585, providing seamless interchange compatibility.
- Drop-in replacement for OMC BRP Cobra water pump assemblies
- Precision-molded for reliable seal and flow under operating conditions
- Compatible with all Cobra King model boat engines
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| OMC | 987176 |
| BRP | 3854072 |
| Sierra | 18-30585 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model |
|---|---|
| OMC | BRP Cobra King (all models) |
Technical Specs
- Part Type
- Water Pump Impeller
- Application
- Outboard Marine Engine
- Fitment
- OMC BRP Cobra King all Models
- OEM Equivalents
- 987176, 3854072, 18-30585
What's in the Box
- Outboard Impeller × 1
Installation Notes
- Disconnect power and allow engine to cool completely before beginning work.
- Remove the lower unit or water pump housing to access the existing impeller.
- Carefully extract the old impeller, noting the direction of blade curvature.
- Inspect the impeller housing and wear plate for scoring or corrosion; replace if damaged.
- Lubricate the new impeller vanes with glycerin or soapy water—never petroleum-based grease.
- Insert the impeller with blades oriented in the correct rotation direction.
- Reassemble the pump housing and lower unit, torquing fasteners to manufacturer specifications.
- Run the engine with water supply and verify consistent cooling flow from the tell-tale.
Troubleshooting & FAQ
How do I know if my impeller needs replacing?
Common signs include reduced or no water flow from the tell-tale, engine overheating, weak stream at idle, or visible cracks and missing vane tips during inspection. Replace impellers annually or every 100–150 hours of operation as preventive maintenance.
Will this fit all OMC Cobra models?
Yes, this impeller is designed for OMC BRP Cobra King all models. Always verify your engine's existing impeller part number against the OEM equivalents listed (987176, 3854072, 18-30585) before purchasing.
Can I install this myself?
If you have basic mechanical experience and the correct tools, installation is straightforward. Follow the outlined steps carefully, ensure correct blade orientation, and use proper lubrication. Professional installation is recommended if you are unsure.
What type of lubricant should I use during installation?
Use glycerin, dish soap solution, or dedicated impeller installation lubricant. Never use petroleum-based grease or oil, as these can damage the rubber and cause premature failure.
How often should I replace my water pump impeller?
Replace annually or every 100–150 operating hours, whichever comes first. More frequent replacement may be needed in sandy or debris-laden water, or if the engine has sat unused for extended periods.
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 against 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.
Payment & Security
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