Water Pump Impeller Kit – 12-Spline, 12-Fin Neoprene Replacement for Volvo Penta 875811-2, 3858256 and 3862281
Water Pump Impeller Kit – 12-Spline, 12-Fin Neoprene Replacement for Volvo Penta 875811-2, 3858256 and 3862281 is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller Kit – 12-Spline, 12-Fin Neoprene Replacement fo...
Water Pump Impeller Kit – 12-Spline, 12-Fin Neoprene Replacement for Volvo Penta 875811-2, 3858256 and 3862281 is backordered and will ship as soon as it is back in stock.
Product Details
This 12-spline, 12-fin water pump impeller kit is a neoprene replacement for selected Volvo Penta marine cooling-system applications. Catalog references identify this impeller kit with Volvo Penta part numbers 875811-2, 3858256 and 3862281, as well as Jabsco 1210-0001 and Johnson Pump 09-1027B.
The flexible neoprene impeller is designed to maintain raw-water circulation through the seawater pump. Confirm the part number, spline configuration, pump design and supplied components against your original part before ordering.
- Product Type: Water pump impeller kit
- Material: Neoprene
- Drive: 12-spline
- Impeller Design: 12 fins
- Application: Selected Volvo Penta marine seawater-pump and cooling-system applications
Part Number Matrix
The following are catalog-listed manufacturer and aftermarket references associated with this impeller-kit design. They are reference numbers only; verify your exact pump application before purchase.
| Brand | Part Number | Reference Type |
|---|---|---|
| Volvo Penta | 875811-2 / 3858256 / 3862281 | Listed replacement references |
| Jabsco | 1210-0001 | Listed cross-reference |
| Johnson Pump | 09-1027B | Listed cross-reference |
Engine & Model Compatibility
This kit is associated with selected Volvo Penta inboard and sterndrive seawater-pump applications using the matching 12-spline, 12-fin impeller. The available catalog evidence confirms the part-number relationships above but does not establish a complete model, horsepower or year range for every engine.
| Brand | Application | Configuration to Verify | Confirmed Reference Numbers | Important Note |
|---|---|---|---|---|
| Volvo Penta | Selected marine seawater-pump and cooling-system applications | 12-spline, 12-fin impeller; matching pump dimensions and cover arrangement | 875811-2, 3858256, 3862281 | Do not use engine displacement or model family alone to confirm fit. |
| Jabsco / Johnson Pump | Applications using the corresponding impeller design | Match the pump manufacturer reference and impeller configuration | 1210-0001 / 09-1027B | Cross-reference numbers must be checked against the installed pump. |
Technical Specs
- Product Type
- Water pump impeller kit
- Replacement Type
- Aftermarket replacement
- Material
- Neoprene
- Drive Type
- 12-spline
- Number of Fins
- 12
- Primary Application
- Selected Volvo Penta marine seawater pumps and related cooling systems
- Confirmed Reference Numbers
- Volvo Penta 875811-2, 3858256 and 3862281; Jabsco 1210-0001; Johnson Pump 09-1027B
- Dimensions
- Verify diameter, width, hub and spline dimensions against the original impeller before installation.
What’s in the Box
This listing is for an impeller kit. Catalog references identify the kit as including service components such as gaskets, O-rings and/or plugs, but component quantities are not consistently specified in the available reference material. Compare the received package with the product images and confirm all required sealing components before beginning installation.
- 1 x 12-fin, 12-spline neoprene impeller
- Service sealing components as supplied with the kit
Installation Notes
- Disconnect the battery and close the raw-water intake seacock before servicing the pump.
- Locate the seawater pump and place an absorbent towel beneath it to catch residual water.
- Remove the pump-cover fasteners and carefully remove the cover plate.
- Remove the old impeller with an impeller puller or suitable pliers. Avoid damaging the pump housing, shaft or cover.
- Inspect the removed impeller for missing fins. If fins are missing, locate and remove them from the cooling passages before operating the engine.
- Clean the pump housing and cover plate. Check for scoring, corrosion and abnormal wear.
- Lightly lubricate the new impeller with a lubricant approved for the pump and impeller material. Do not use petroleum products unless specifically approved by the pump manufacturer.
- Install the impeller with the blades oriented in the correct direction for pump rotation. The blades will flex as the impeller enters the housing.
- Install the supplied gasket, O-ring or other sealing component that matches the pump cover and original configuration.
- Reinstall the cover plate and tighten the fasteners evenly to the pump manufacturer’s specifications.
- Open the seacock, reconnect the battery and start the engine. Check for water flow, overheating and leaks around the pump cover.
Troubleshooting & FAQ
How do I know if this impeller fits my pump?
Check that your existing impeller or pump is associated with Volvo Penta 875811-2, 3858256 or 3862281, or with Jabsco 1210-0001 or Johnson Pump 09-1027B. Also verify the 12-spline, 12-fin configuration and the physical dimensions before ordering.
Is this a complete water pump?
No. This is an impeller kit for servicing a compatible seawater or raw-water pump. The pump housing, shaft, cover and other pump components are not included unless specifically shown as part of the package.
What are the signs of a failing impeller?
Common signs include engine overheating, reduced raw-water flow, irregular water discharge, damaged or stiff blades, and visible cracking or deformation. A failed impeller can cause serious engine damage if operation continues.
How often should I replace the impeller?
Inspect the impeller at the interval recommended by your engine or pump manufacturer. Replacement timing depends on operating hours, storage conditions and whether the boat operates in saltwater, freshwater or sandy water. Replace it whenever the blades show cracking, hardening, distortion or other damage.
Are the blades supposed to bend during installation?
Yes. Flexible impeller blades bend as they pass through the pump housing. Install them in the direction required by the pump’s rotation and lubricate the impeller with a compatible lubricant.
Is this an OEM part?
No. This listing is for an aftermarket replacement impeller kit. The listed Volvo Penta, Jabsco and Johnson Pump numbers are manufacturer or cross-reference numbers used to help confirm application.
Does the kit include gaskets and O-rings?
The referenced impeller-kit listings identify sealing components such as gaskets, O-rings and plugs, but the available catalog material does not consistently state the quantity for each component. Verify the actual package contents before installation.
Can I install this myself?
Impeller replacement is a common marine maintenance procedure, but the work should be performed only by someone familiar with the engine and raw-water system. If you are unsure about pump rotation, sealing components or installation torque, consult a qualified marine technician.
Safety & Important Info
- Verify the complete manufacturer part number, spline count, fin count and dimensions before ordering.
- Do not rely on engine displacement, horsepower or model family alone to confirm fitment.
- Close the seacock and disconnect the battery before servicing the pump.
- Inspect the pump housing and cover whenever the impeller is replaced.
- This is an aftermarket replacement, not an OEM component.
About Sea Sierra
- Marine Maintenance Focus — Replacement parts selected for common seawater-pump and cooling-system service applications.
- Application-First Information — Use the listed manufacturer references and physical configuration to verify compatibility.
- Service Support — Review the complete package contents and installation requirements before beginning maintenance.
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