Impeller Repair Kit – Fits Volvo Penta 3.0-8.1L (Replaces 21951348, 21213660)
Impeller Repair Kit – Fits Volvo Penta 3.0-8.1L (Replaces 21951348, 21213660) 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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Impeller Repair Kit – Fits Volvo Penta 3.0-8.1L (Replaces 21951348,...
Impeller Repair Kit – Fits Volvo Penta 3.0-8.1L (Replaces 21951348, 21213660) is backordered and will ship as soon as it is back in stock.
Product Details
This Impeller Repair Kit – Fits Volvo Penta 3.0-8.1L (Replaces 21951348, 21213660) is designed for Volvo Penta 3.0L, 4.3L, 5.0L, 5.7L, and 8.1L engines using a crank-driven sea water pump from 1999 to 2005. It is specifically engineered for models where the pump is mounted directly on the crankshaft.
This kit serves as a direct replacement for multiple Volvo Penta and Sierra part numbers, providing a comprehensive solution for impeller service.
- Engineered for direct replacement of the original impeller and stop lug.
- Features a durable neoprene impeller designed for marine environments.
- Includes the critical stop lug, which prevents rotational slippage.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Volvo Penta | 21951348 | |
| Volvo Penta | 21213660 | |
| Volvo Penta | 3862567 | |
| Volvo Penta | 3857954 | Stop Lug |
| Volvo Penta | 3858256 | |
| Volvo Penta | 3855546 | |
| Volvo Penta | 876243 | |
| Volvo Penta | 806590 | |
| Volvo Penta | 860203 | |
| Volvo Penta | 3856039 | |
| Volvo Penta | 875811 | |
| Volvo Penta | 3850107 | |
| Sierra | 18-3276-1 | |
| Sierra | 18-3277 | |
| Sierra | 18-3081 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Volvo Penta | 3.0L | Multiple | 4-Stroke | 1999–2005 | 21951348 | Crank-driven sea water pump |
| Volvo Penta | 4.3L | Multiple | 4-Stroke | 1999–2005 | 21951348 | Crank-driven sea water pump |
| Volvo Penta | 5.0L | Multiple | 4-Stroke | 1999–2005 | 21951348 | Crank-driven sea water pump |
| Volvo Penta | 5.7L | Multiple | 4-Stroke | 1999–2005 | 21951348 | Crank-driven sea water pump |
| Volvo Penta | 8.1L | Multiple | 4-Stroke | 1999–2005 | 21951348 | Crank-driven sea water pump |
Technical Specs
- Product Type
- Impeller Repair Kit
- Installation
- Direct Replacement
- Dimensions
- Width: 31.5 mm (1-1/4"), Diameter: 57 mm (2-1/4")
- Impeller Material
- Neoprene
- Drive Type
- 12 Spline
- Shaft Diameter
- 16 mm (5/8")
- Blade Configuration
- 12 blades
What’s in the Box
- 1 x Impeller (21951348)
- 1 x Stop Lug (3857954)
- 1 x O-Ring
Installation Notes
- Close the engine's water inlet seacock.
- Loosen the sea water pump's cover plate screws and remove the cover.
- Use pliers or an impeller puller to carefully remove the old impeller. Note the rotational direction of the blades.
- Clean the inside of the pump housing and the cover plate, ensuring no old impeller pieces remain.
- Lightly lubricate the new impeller and housing interior with water-resistant grease or soap.
- Install the new impeller with a twisting motion, ensuring the blades are oriented in the correct direction.
- Align and install the new O-ring in its groove. A light adhesive can hold it in place.
- Reinstall the pump cover and tighten the screws evenly. Do not overtighten.
- Open the seacock and start the engine, immediately checking the pump for leaks.
Troubleshooting & FAQ
How do I know if this impeller kit will fit my engine?
This kit is for Volvo Penta 3.0L, 4.3L, 5.0L, 5.7L, and 8.1L engines from 1999–2005 that use a crank-driven sea water pump. Please verify your pump model and part number against our compatibility tables before ordering.
What are signs of a failing impeller or stop lug?
Common signs of impeller failure include engine overheating at idle or low speeds, reduced water flow from the exhaust, and cracks or stiffness in the impeller blades. The stop lug can degrade over time and become a soft, gooey mess, which indicates an urgent need for replacement to prevent impeller slippage.
What is the purpose of the stop lug?
The stop lug is a critical component that fits into a slot on the pump shaft. It prevents the impeller from spinning freely on the shaft, ensuring it engages correctly and pumps water efficiently. This kit includes the necessary stop lug.
How often should a sea water pump impeller be replaced?
For preventative maintenance, it is recommended to inspect your impeller annually and replace it every 1-2 years, or after every 100-200 hours of use, depending on operating conditions (e.g., water quality, frequency of use). Always replace it if you notice any signs of wear or damage.
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.
Payment & Security
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