Impeller Kit for Volvo Penta 3.0–8.1L V6/V8 Engines — Replaces 21951348 and 21213660
Impeller Kit for Volvo Penta 3.0–8.1L V6/V8 Engines — Replaces 21951348 and 21213660 is backordered and will ship as soon as it is back in stock.
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Impeller Kit for Volvo Penta 3.0–8.1L V6/V8 Engines — Replaces 2195...
Impeller Kit for Volvo Penta 3.0–8.1L V6/V8 Engines — Replaces 21951348 and 21213660 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket impeller service kit is intended for selected Volvo Penta gasoline engines using a crankshaft-driven seawater pump. It is listed as a replacement for Volvo Penta references 21951348 and 21213660, with additional reference numbers shown below.
Fitment depends on the exact pump design and engine configuration. Before ordering, compare the part number and pump arrangement on your engine with the information in this listing.
- Engine application: Selected Volvo Penta 3.0L, 4.3L, 5.0L, 5.7L, and 8.1L gasoline engines.
- Installation location: Crank-driven seawater pump.
- Kit contents: Neoprene impeller, stop lug, and O-ring.
Part Number Matrix
The following numbers are reference identifiers associated with this impeller application. They are not a substitute for checking the pump and original part on your engine.
| Brand | Part Number |
|---|---|
| Volvo Penta | 21951348 |
| Volvo Penta | 21213660 |
| Volvo Penta | 806590 |
| Volvo Penta | 876243 |
| Volvo Penta | 3855546 |
| Volvo Penta | 860203 |
| Volvo Penta | 6605343 |
| Volvo Penta | 3856039-7 / 3856039 |
| Volvo Penta | 875811-2 / 875811 |
| Volvo Penta | 3858256 |
| Volvo Penta | 3850107 |
| Volvo Penta | 3862281 |
| Volvo Penta | 3862567 |
| Volvo Penta | 21213650 |
| Sierra | 18-3277 |
| Sierra | 18-3081 |
Engine and Model Compatibility
This listing covers selected Volvo Penta gasoline engines in the 3.0L–8.1L range, commonly associated with crankshaft-mounted seawater pumps. The year range below is a reference guide rather than a guarantee for every engine configuration. Verify the pump number and original impeller before installation.
| Brand | Engine | Rated HP | Stroke | Reference Years | Reference Part No. | Application Note |
|---|---|---|---|---|---|---|
| Volvo Penta | 3.0L | 130–140 | 4-Stroke | 1999–2005 | 21951348 | Crank-driven seawater pump |
| Volvo Penta | 4.3L | 180–225 | 4-Stroke | 1999–2005 | 21951348 | Crank-driven seawater pump |
| Volvo Penta | 5.0L | 200–270 | 4-Stroke | 1999–2005 | 21951348 | Crank-driven seawater pump |
| Volvo Penta | 5.7L | 250–320 | 4-Stroke | 1999–2005 | 21951348 | Crank-driven seawater pump |
| Volvo Penta | 8.1L | 375–420 | 4-Stroke | 1999–2005 | 21951348 | Crank-driven seawater pump |
| Pump Number | Brand | Reference Years | Application Note |
|---|---|---|---|
| 3812693 | Volvo Penta | 1999–2005 | Crank-driven seawater pump |
| 3812695 | Volvo Penta | 1999–2005 | Crank-driven seawater pump |
| 3812696 | Volvo Penta | 1999–2005 | Crank-driven seawater pump |
| 3812697 | Volvo Penta | 1999–2005 | Crank-driven seawater pump |
| 3857202 | Volvo Penta | 1999–2005 | Crank-driven seawater pump |
| 3858229 | Volvo Penta | 1999–2005 | Crank-driven seawater pump |
| 3860795 | Volvo Penta | 1999–2005 | Crank-driven seawater pump |
| 3862482 | Volvo Penta | 1999–2005 | Crank-driven seawater pump |
| 3862484 | Volvo Penta | 1999–2005 | Crank-driven seawater pump |
| 3862485 | Volvo Penta | 1999–2005 | Crank-driven seawater pump |
| 3862487 | Volvo Penta | 1999–2005 | Crank-driven seawater pump |
| 21214595 | Volvo Penta | 1999–2005 | Crank-driven seawater pump |
| 21214596 | Volvo Penta | 1999–2005 | Crank-driven seawater pump |
| 21214599 | Volvo Penta | 1999–2005 | Crank-driven seawater pump |
| 21214601 | Volvo Penta | 1999–2005 | Crank-driven seawater pump |
Technical Specifications
- Product Type
- Impeller service kit with stop lug
- Installation
- Crank-driven seawater pump
- Impeller Width
- 31.5 mm (1-1/4 in)
- Impeller Diameter
- 57 mm (2-1/4 in)
- Shaft Size
- 16 mm (5/8 in)
- Fitting Type
- 12-spline
- Impeller Material
- Neoprene
- Blade Count
- 12
What's in the Box
- 1 × Neoprene impeller, replacing references 21213660 and 21951348
- 1 × Stop lug, replacing reference 3857954
- 1 × O-ring
Installation Notes
- Close the engine's raw-water intake seacock.
- Locate the seawater pump, typically mounted at the engine crankshaft pulley.
- Remove the screws securing the pump end cover.
- Remove the old impeller with pliers or an impeller puller, noting the blade rotation direction.
- Clean debris and old sealing material from the pump housing and cover.
- Lightly lubricate the housing and new impeller with water-resistant grease or suitable soap.
- Install the impeller with the blades bent in the correct direction.
- Install the new O-ring in its correct groove or sealing position.
- Reinstall the end cover and tighten the screws evenly.
- Open the seacock before starting the engine.
- Start the engine and check immediately for water flow and leaks around the pump cover.
Troubleshooting and FAQ
How do I confirm that this impeller fits my engine?
Compare the original impeller, pump number, and pump arrangement with the reference numbers and application information above. The engine displacement and year alone are not sufficient because pump configurations can vary.
What are common signs of a failing impeller?
Symptoms may include overheating at idle or low speed, reduced water flow from the exhaust, damaged or missing blades, or leakage around the pump housing.
How often should an impeller be replaced?
Replacement intervals depend on operating conditions, storage, water contamination, and the manufacturer's maintenance schedule. Inspect the impeller regularly and replace it when blades show cracking, wear, distortion, or loss.
Why should the pump number be checked?
Engines in the same displacement family may use different pumps or impellers. Matching the pump and original part helps prevent ordering an otherwise similar but incompatible component.
What is the stop lug used for?
The stop lug is used by applicable pump designs to prevent the impeller from turning on the shaft. Install it only in the position and configuration used by the original pump.
What should I check if the engine still overheats?
Check the raw-water intake, strainers, hoses, pump cover, heat exchanger, exhaust passages, thermostat, and closed-cooling circuit where applicable. Confirm that the new impeller is installed in the correct direction and that no damaged blade fragments remain in the cooling passages.
Is this an OEM part?
No. This is an aftermarket replacement kit. Volvo Penta and Sierra names and part numbers are used only to identify application and reference compatibility.
Safety and Important Information
- Verify the original part and pump configuration before ordering.
- Close the seacock before servicing the pump and reopen it before operating the engine.
- Do not operate the engine without an adequate supply of cooling water.
- Inspect for leaks and confirm proper water flow immediately after installation.
- Professional installation is recommended when the pump or cooling system is difficult to access.
About Sea Sierra
- Marine replacement parts — Parts selected for common service and repair applications.
- Application-focused listings — Reference numbers and installation information are provided to help verify fitment.
- Customer support — Contact support with your engine, pump, and original-part details when application confirmation is needed.
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