Water Pump Impeller Kit for Selected Volvo Penta Gasoline Inboard Engines – Replaces 21213660 and 21951348
Water Pump Impeller Kit for Selected Volvo Penta Gasoline Inboard Engines – Replaces 21213660 and 21951348 is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller Kit for Selected Volvo Penta Gasoline Inboard E...
Water Pump Impeller Kit for Selected Volvo Penta Gasoline Inboard Engines – Replaces 21213660 and 21951348 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump impeller service kit is designed for selected Volvo Penta gasoline inboard cooling-system applications. It replaces the Volvo Penta reference numbers 21213660 and 21951348 where the engine is equipped with the matching sea-water pump and impeller configuration.
Catalog references associate this application with Volvo Penta gasoline engines and inboard models using the relevant pump arrangement, including selected 3.0L, 4.3L, 5.0L, 5.7L, 5.8L, 7.4L and 8.2L applications. Engine model, pump design, cover-screw arrangement and the original impeller should be checked before ordering.
- CR/neoprene rubber impeller for marine cooling-system service.
- Service-kit format for replacing the impeller during routine raw-water-pump maintenance.
- Use a water-based lubricant such as glycerin or mild dish soap during installation; do not use petroleum-based grease or oil on the neoprene rubber.
Part Number Matrix
The references below are provided for identification and cross-reference purposes. Confirm the complete pump and engine application before purchase.
| Brand | Part Number | Reference |
|---|---|---|
| Volvo Penta | 21213660 | OEM application reference |
| Volvo Penta | 21951348 | OEM application reference; catalog listings identify an impeller kit with gasket |
| Volvo Penta | 3857954 | Additional reference listed with the 21951348 gasoline-engine application |
| Sierra | 18-3276-1 | Impeller-kit reference replacing 3862567 and 21213660 |
| Johnson Pump | 09-1027B | Catalog cross-reference for the related Volvo Penta impeller application |
| Jabsco | 1210-0001 | Catalog cross-reference for the related impeller application |
Engine & Model Compatibility
Compatibility depends on the exact sea-water pump installed on the engine. The following catalog references are useful application leads, not a substitute for comparing the original impeller and pump cover.
| Brand | Engine or Model Reference | Fuel Type | Application Note |
|---|---|---|---|
| Volvo Penta | 3.0GL/GS | Gasoline | Listed with the 21213660 impeller application |
| Volvo Penta | 4.3GL/GS and related GL/Gi/GIP/GLP/GS variants | Gasoline | Verify the exact engine suffix and pump configuration |
| Volvo Penta | 5.0L and 5.7L gasoline variants | Gasoline | Verify model suffix, pump arrangement and original impeller |
| Volvo Penta | 5.8L, 7.4L and 8.2L gasoline variants | Gasoline | Catalog application references vary by model and production configuration |
| Volvo Penta | AQ, BB and related inboard model references | Gasoline | Use the original part number and pump details for final confirmation |
Important: Do not rely on engine displacement alone. Some apparently similar Volvo Penta engines use different impellers, pumps, cover plates or fastener arrangements.
Technical Specs
- Product Type
- Inboard engine water-pump impeller service kit
- Application
- Selected Volvo Penta gasoline inboard sea-water pumps
- Impeller Material
- CR/neoprene rubber
- Impeller Style
- Flexible rubber impeller with grooved/socket-style hub reference
- Blade Count
- 12 blades
- Approximate Diameter
- 57 mm
- Spline Count
- 12-spline reference
- Installation
- Replacement service in the matching water-pump housing
- Maintenance
- Inspect regularly and replace when worn, damaged or hardened; annual replacement is commonly used as a preventive-maintenance interval
What’s in the Box
- 1 x Neoprene/CR rubber water-pump impeller
- Service sealing components intended for the matching kit application
Kit contents can vary by pump configuration. Confirm the supplied seals against the removed components before installation; this listing does not include a complete water-pump housing or pump assembly.
Installation Notes
- Stop the engine, disconnect the battery and close the water inlet seacock or otherwise isolate the raw-water supply.
- Locate the sea-water pump and remove the housing-cover fasteners and cover plate.
- Record the original impeller orientation before removal. Carefully withdraw the old impeller without damaging the housing.
- Inspect the pump housing, cover plate, key or drive interface and sealing surfaces for scoring, corrosion or wear.
- Clean the housing and sealing surfaces thoroughly.
- Apply a water-based lubricant to the new impeller and housing. Do not use petroleum-based lubricants.
- Install the impeller with a slight twisting motion and orient the blades to match the direction required by the pump.
- Install the appropriate new sealing component supplied for the application, then refit the cover plate.
- Tighten the cover fasteners evenly and according to the engine or pump manufacturer's procedure.
- Open the seacock, reconnect the battery, start the engine and check immediately for leaks, normal temperature and proper raw-water discharge.
Troubleshooting & FAQ
How do I confirm that this kit fits my Volvo Penta engine?
Compare your original impeller, pump housing and all available part numbers with the references in this listing. Confirm the exact engine model and suffix, fuel type, pump arrangement and cover-fastener configuration. A displacement-only match is not sufficient.
What are signs that the impeller needs replacement?
Common signs include engine overheating, reduced raw-water flow, a high temperature reading, damaged or missing blades, hardened rubber or visible cracking. Pieces from a failed impeller should also be located and removed from the cooling system.
How often should the impeller be replaced?
Replacement timing depends on use, storage conditions and inspection results. Many marine service schedules call for annual replacement or replacement at the manufacturer's specified operating-hour interval, whichever comes first.
What lubricant should be used during installation?
Use glycerin or another compatible water-based lubricant. Mild dish soap may be used for installation. Avoid petroleum-based grease and oil because they can damage or swell neoprene rubber.
Is this an OEM Volvo Penta component?
No. This is an aftermarket replacement service kit. Volvo Penta, Sierra, Johnson Pump and Jabsco names and part numbers are used only to identify potential applications and references; the part is not manufactured by those brands.
What should I do if my old impeller looks different?
Do not install the part based only on the engine size. Compare the diameter, width, hub or spline arrangement, blade count and sealing arrangement. If these details do not match, confirm the application before ordering.
Safety & Important Information
- Work only on a stopped and cooled engine, with the battery disconnected and the raw-water supply closed.
- Verify the original impeller and pump configuration before purchase and installation.
- Inspect the pump housing and cover plate whenever the impeller is replaced.
- After installation, check for leaks and confirm normal cooling-water flow before operating the boat normally.
- This is an aftermarket replacement part, not an original OEM component.
About Sea Sierra
- Marine Replacement Parts — Practical replacement components for routine boat and engine maintenance.
- Application-Focused Information — Cross-reference numbers and engine details are provided to help customers compare the original part.
- Support for Fitment Questions — When in doubt, provide the engine model, serial information, original part number and pump photographs before ordering.
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