Sierra Raw Water Pump Impeller 18-8926 – Volvo Penta / OMC / Crusader Marine Engines
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
The Sierra 18-8926 Raw Water Pump Impeller is a high-quality replacement impeller designed to maintain proper seawater flow in marine cooling systems. This impeller is a critical component responsible for drawing water through the engine to regulate operating temperature and prevent overheating.
Manufactured to meet or exceed OEM specifications, this impeller features durable, flexible rubber vanes and a precision-fit hub to ensure reliable performance in both freshwater and saltwater environments.
Ideal for routine maintenance or replacing worn or damaged impellers, the 18-8926 helps restore full cooling system efficiency and protects your engine from heat-related damage.
Key Features
- Direct replacement raw water pump impeller
- Flexible rubber vanes for efficient water flow
- Precision-fit hub for secure installation
- Maintains proper engine cooling performance
- Marine-grade construction for durability
- Sierra limited lifetime warranty
Engine Compatibility
Volvo Penta
- AQ Series engines
- Small block V6 / V8 applications
- Select sterndrive and inboard setups
OMC / Cobra / Stringer
- GM-based V6 and V8 engines
Crusader / PCM / Inboard Engines
- 4.3L, 5.0L, 5.7L, 7.4L, 8.1L (verify application)
➡️ Fits engines equipped with compatible engine-mounted or crank-driven raw water pumps.
Serial Number Fitment Notice
Fitment depends on:
- Exact pump model
- Shaft size and spline configuration
- Engine manufacturer and year
⚠️ Always confirm using:
- Pump model or casting number
- OEM part number match (18-8926 cross reference)
When This Part Needs Replacement
Replace the impeller if you notice:
- Reduced or no water flow
- Engine overheating
- Cracked, missing, or hardened impeller vanes
- Reduced cooling at higher RPM
- After seasonal storage
Recommended service interval: every 100 hours or annually
Installation Notes
- Lubricate impeller before installation
- Install with correct vane rotation
- Inspect pump housing and wear plate
- Replace gasket or O-ring as required
- Check for debris from old impeller in system
Alternate / Superseded Part Numbers
OEM Cross References
- Volvo Penta: 875583, 3858256
- OMC: 0986397
Aftermarket Cross References
- Johnson Pump: 09-812B
- Jabsco: 1210-0001
Shipping
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
💡 Parts Desk Insight
Impellers often fail gradually—still moving water at idle but not enough at higher speeds. Replacing yours on schedule helps avoid overheating when you're out on the water and need full engine performance 👍
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.