Impeller Kit with 4-Hole Gasket for Volvo Penta Marine Engines – Replaces 875575 and 855901
Impeller Kit with 4-Hole Gasket for Volvo Penta Marine Engines – Replaces 875575 and 855901 is backordered and will ship as soon as it is back in stock.
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Impeller Kit with 4-Hole Gasket for Volvo Penta Marine Engines – Re...
Impeller Kit with 4-Hole Gasket for Volvo Penta Marine Engines – Replaces 875575 and 855901 is backordered and will ship as soon as it is back in stock.
Product Details
This impeller kit with 4-hole gasket is intended for raw-water cooling pump service on a range of Volvo Penta marine engines. The compatibility references include older AQ, BB, MB, MD and related engine models. Always compare the engine model, pump configuration and existing service-part numbers before ordering.
The kit includes one neoprene impeller and one 4-hole gasket. The impeller is listed as a replacement for Volvo Penta reference numbers 875575, 21951350 and 831182; the gasket is listed as a replacement for 855901. Sierra 18-3075 is included as an aftermarket reference for the impeller.
- Application: Marine engine raw-water cooling pump service.
- Impeller construction: Neoprene with a brass insert.
- Drive: Key-drive configuration; verify the pump shaft and key before installation.
- Kit contents: One impeller and one 4-hole gasket.
- Product type: Aftermarket replacement service kit, not an OEM-branded component.
Part Number Matrix
These references are provided to help compare the impeller and gasket with the parts removed from your pump. Part-number matching should be confirmed together with the engine and pump model.
| Brand or source | Part number | Component or reference |
|---|---|---|
| Volvo Penta | 875575 | Impeller reference |
| Volvo Penta | 21951350 | Impeller reference |
| Volvo Penta | 831182 | Impeller reference |
| Volvo Penta | 855901 | 4-hole gasket reference |
| Sierra | 18-3075 | Aftermarket impeller reference |
Engine and Model Compatibility
The following model references are associated with this service application. Confirm the exact engine model, pump assembly, shaft dimensions and existing part number before installation. The Johnson references identify pump models and should not be treated as engine-model interchange numbers by themselves.
| Brand | Model | Related impeller reference | Notes |
|---|---|---|---|
| Volvo Penta | 230A, 230B | 875575 / 21951350 | Verify pump configuration. |
| Volvo Penta | 250A, 250B, 251A | 875575 / 21951350 | Verify pump configuration. |
| Volvo Penta | AQ115A, AQ115B, AQ120B | 875575 / 21951350 | Verify engine and pump details. |
| Volvo Penta | AQ125A, AQ125B, AQ130, AQ130A, AQ130B, AQ130C, AQ130D | 875575 / 21951350 | Verify engine and pump details. |
| Volvo Penta | AQ131A, AQ131B, AQ131C, AQ131D | 875575 / 21951350 | Verify engine and pump details. |
| Volvo Penta | AQ140A, AQ145A, AQ145B | 875575 / 21951350 | Verify engine and pump details. |
| Volvo Penta | AQ151A, AQ151B, AQ151C | 875575 / 21951350 | Verify engine and pump details. |
| Volvo Penta | AQ165A, AQ170A, AQ170B, AQ170C, AQ171A, AQ171C | 875575 / 21951350 | Verify engine and pump details. |
| Volvo Penta | AQD21A, AQD21B | 875575 / 21951350 | Verify engine and pump details. |
| Volvo Penta | BB115A, BB115B, BB115C, BB140A, BB145A | 875575 / 21951350 | Verify engine and pump details. |
| Volvo Penta | BB165A, BB170A, BB170B, BB170C | 875575 / 21951350 | Verify engine and pump details. |
| Volvo Penta | MB20A, MB20B, MB20C, MD21A, MD21B | 875575 / 21951350 | Verify engine and pump details. |
| Johnson | 10-32621-2 | — | Pump model reference; confirm the installed pump and impeller dimensions. |
| Johnson | 10-32621-3 | — | Pump model reference; confirm the installed pump and impeller dimensions. |
Technical Specifications
- Product type
- Water pump impeller kit
- Installation
- Marine engine raw-water cooling pump
- Impeller diameter
- 57 mm (2-1/4 in)
- Impeller width
- 31.5 mm (1-1/4 in)
- Shaft size
- 16 mm (5/8 in)
- Drive type
- Key drive with 3/16 in key specification
- Impeller blades
- 12
- Impeller profile
- K silhouette
- Impeller material
- Neoprene
- Insert material
- Brass
- Approximate weight
- 100 g (0.22 lb)
What's in the Box
- 1 x neoprene impeller with brass insert
- 1 x 4-hole gasket
The impeller and gasket are supplied together as one service kit. The kit does not include a pump cover, key, screws, lubricant or other pump hardware.
Installation Notes
- Close the water inlet valve or seacock before beginning work.
- Locate the raw-water pump on the engine. Remove any guard or obstruction required for safe access.
- Loosen the pump-cover screws and remove the cover. Note the direction in which the old impeller blades are bent.
- Remove the old impeller with suitable pliers or an impeller puller if necessary. Avoid damaging the pump housing.
- Remove all old gasket material and clean the mating surfaces.
- Lubricate the pump housing and new impeller with a water-based lubricant or glycerine. Do not use petroleum grease.
- Install the new impeller with the blades oriented in the same direction as the original impeller.
- Fit the new 4-hole gasket to the pump housing or cover according to the pump design.
- Reinstall the pump cover and tighten the screws evenly without overtightening.
- Open the water inlet valve. Start the engine and immediately check for leaks, overheating and proper cooling-water flow.
Troubleshooting and FAQ
How do I confirm that this kit fits my Volvo Penta engine?
Match your complete engine model and the installed raw-water pump with the compatibility references above. Also compare the impeller diameter, width, shaft size, drive key and existing service-part number. If any of these details differ, confirm the application with a qualified marine-parts specialist before ordering.
What are the signs of a failing water-pump impeller?
Common signs include engine overheating at idle or low speed, reduced water flow from the exhaust, visible cracks or missing blades, and water leakage around the pump cover.
How often should the impeller be replaced?
Inspect the impeller at least annually and replace it according to the engine manufacturer's maintenance schedule and the boat's operating conditions. Salt water, sand, dry running and long periods of storage can accelerate wear.
Does the kit include the replacement key?
No. The kit includes one impeller and one 4-hole gasket. The pump key and other pump hardware are not included, so reuse them only if they are serviceable and match the pump specification.
Can I install this kit myself?
Impeller replacement is a common maintenance procedure for boat owners with suitable mechanical skills. Follow the engine and pump manufacturer's procedures, and consult a professional marine mechanic if you are unsure about access, orientation or sealing.
Is this an OEM part?
No. This listing is for an aftermarket replacement kit corresponding to the reference numbers shown on this page. Volvo Penta, Johnson and Sierra names and part numbers are used only to identify application and reference compatibility.
What are the warranty and return terms?
Warranty and return eligibility are governed by the current store policies. Contact customer support before installation if the supplied parts do not match the confirmed pump application.
Safety and Important Information
- Verify the engine model, pump model, dimensions and reference numbers before purchase.
- Do not run the engine without an adequate water supply to the raw-water pump.
- Close the seacock before removing the pump cover and reopen it before operating the engine.
- Inspect the pump housing, cover, key and shaft during service; replace damaged hardware as required.
- This is an aftermarket replacement kit, not an OEM-branded component.
- Professional installation is recommended when the correct application or installation procedure is uncertain.
About Sea Sierra
- Marine Replacement Parts — We supply aftermarket marine service components for routine maintenance and repair.
- Application-Focused Support — Match the engine, pump and reference information before ordering to help ensure the correct replacement.
- Customer Assistance — Contact support with your engine and pump details if you need help confirming the application.
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