Water Pump Impeller Replacement – Fits Volvo Penta, Johnson/Jabsco and Yanmar (Replaces 21951356, 09-1028B, 920-0001)
Water Pump Impeller Replacement – Fits Volvo Penta, Johnson/Jabsco and Yanmar (Replaces 21951356, 09-1028B, 920-0001) is backordered and will ship as soon as it is back in stock.
Worry-free returns
Worry-free returns
Shop with confidence. If you’re not completely satisfied, eligible items may be returned within the return window, provided they are unused and in original packaging.
If the return is due to our error or a defective item, we’ll make it right.
Please contact us before returning any item.
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.
International delivery times may vary due to customs processing.
Tracking information will be provided once your order ships.
Water Pump Impeller Replacement – Fits Volvo Penta, Johnson/Jabsco ...
Water Pump Impeller Replacement – Fits Volvo Penta, Johnson/Jabsco and Yanmar (Replaces 21951356, 09-1028B, 920-0001) is backordered and will ship as soon as it is back in stock.
Product Details
This marine water pump impeller is a replacement component for raw-water cooling systems used with selected Volvo Penta and Yanmar marine engines and Johnson/Jabsco raw-water pumps. It is intended to help restore proper cooling-water flow when the original impeller is worn, cracked, stiff, or missing blades.
This listing is for the impeller itself rather than a complete installation kit. Confirm the part number, pump application, drive style, and dimensions before ordering. The impeller is listed as an aftermarket replacement for the references shown below.
- Neoprene impeller with a brass insert.
- Internal spline-drive configuration.
- Eight-blade design.
- Some compatible pump applications may use a threaded hub to assist removal with the correct puller tool; verify your existing impeller before installation.
Part Number Matrix
Use the following references as identification and interchange leads. Always compare the old impeller and pump specifications before purchase.
| Brand | Part Number |
|---|---|
| Volvo Penta | 21951356 |
| Volvo Penta | 3841697 |
| Volvo Penta | 875593 |
| Volvo Penta | 877061 |
| Johnson | 09-1028B |
| Johnson | 09-1028B-1 |
| Johnson | 09-1028BT-1 |
| Jabsco | 920-0001 |
| Jabsco | 920-0001-P |
| Jabsco | 17937-0001 |
| Sherwood | 18200K |
| Yanmar | 127610-42200 |
| Yanmar | 123325-42020 |
| Yanmar | 120650-42310 |
| Sierra | 18-3077 |
Engine & Pump Compatibility
The applications below are provided as model-identification references. Model, horsepower, stroke, shaft configuration, serial range, and pump version must remain compatible together. Verify the existing impeller and pump dimensions before installation.
Volvo Penta engines:
| Brand | Model | Rated HP | Stroke | Reference Part No. |
|---|---|---|---|---|
| Volvo Penta | D4-145I | 145 | 4-Stroke | 21951356 |
| Volvo Penta | D4-150A | 150 | 4-Stroke | 21951356 |
| Volvo Penta | D4-175I | 175 | 4-Stroke | 21951356 |
| Volvo Penta | D4-180I | 180 | 4-Stroke | 21951356 |
| Volvo Penta | D4-210A, D4-210I | 210 | 4-Stroke | 21951356 |
| Volvo Penta | D4-225A, D4-225I | 225 | 4-Stroke | 21951356 |
| Volvo Penta | D4-230A, D4-230I | 230 | 4-Stroke | 21951356 |
| Volvo Penta | D4-260A, D4-260D, D4-260I | 260 | 4-Stroke | 21951356 |
| Volvo Penta | D4-270A, D4-270I | 270 | 4-Stroke | 21951356 |
| Volvo Penta | D4-300A, D4-300D, D4-300I | 300 | 4-Stroke | 21951356 |
| Volvo Penta | D4-320A, D4-320I | 320 | 4-Stroke | 21951356 |
| Volvo Penta | D41, D41A, D41B, D41D; D41L-A | 4-Stroke | 21951356 | |
| Volvo Penta | D7A, D7C | 4-Stroke | 21951356 | |
| Volvo Penta | MD30, MD31, MD40, MD70, MD100, MD120; MD2010 | 4-Stroke | 21951356 | |
| Volvo Penta | AD30, AD31, AD40, AD41; AD31L-A, AD31XD; AD41L-A, AD41P-A | 4-Stroke | 21951356 |
Yanmar engines:
| Brand | Model | Rated HP | Stroke | Reference Part No. |
|---|---|---|---|---|
| Yanmar | 4BY150, 4BY150Z | 150 | 4-Stroke | 127610-42200 |
| Yanmar | 4BY180, 4BY180Z | 180 | 4-Stroke | 127610-42200 |
| Yanmar | 4LHA-DTE, 4LHA-DTZE; 4LHA-HTE, 4LHA-HTP | 4-Stroke | 127610-42200 | |
| Yanmar | 4LHA-STE, 4LHA-STP, 4LHA-STZE | 4-Stroke | 127610-42200 | |
| Yanmar | 4LH-DTE, 4LH-HTE, 4LH-STE, 4LH-TE | 4-Stroke | 127610-42200 | |
| Yanmar | 6BY220, 6BY220Z | 220 | 4-Stroke | 127610-42200 |
| Yanmar | 6BY260, 6BY260Z | 260 | 4-Stroke | 127610-42200 |
Johnson/Jabsco raw-water pumps:
| Brand | Pump Model | Reference Part No. | Application |
|---|---|---|---|
| Jabsco | 17050-0001 | 920-0001 | Raw-water pump |
| Jabsco | 29630-1101 | 920-0001 | Raw-water pump |
| Jabsco | 9700-001 | 920-0001 | Raw-water pump |
| Jabsco | 2300-9005 | 920-0001 | Raw-water pump |
| Jabsco | 8170-9001 | 920-0001 | Raw-water pump |
| Jabsco | 29630-1201 | 920-0001 | Raw-water pump |
Technical Specifications
- Product Type
- Water pump impeller replacement
- Installation
- Internal spline drive
- Outer Diameter
- 65 mm (2.56 in)
- Inner Shaft Diameter
- 15.8 mm (0.62 in)
- Width / Height
- 50.2 mm (1.97 in)
- Number of Blades
- 8
- Drive Type
- Spline drive
- Insert Material
- Brass
- Impeller Material
- Neoprene
- Weight
- 215 g (0.47 lb)
- Color
- Black
What's in the Box
- 1 x Water pump impeller
Important: This listing does not state that an O-ring, gasket, seal, or puller tool is included. Reuse or purchase the correct cover-plate seal separately if required by your pump.
Installation Notes
- Shut off the engine and close the raw-water intake seacock before beginning work.
- Remove the cover plate from the seawater pump to access the impeller.
- Use an impeller puller or suitable gripping tool to remove the old impeller. Avoid prying against the pump housing with screwdrivers.
- Clean the pump cavity and inspect the housing, cover plate, shaft, and drive surfaces for scoring or damage.
- Lubricate the new impeller and pump cavity with water-based lubricant or glycerin. Do not use petroleum-based grease.
- Install the impeller with the blades bent in the direction of pump rotation.
- Inspect or replace the cover-plate O-ring or gasket as required by the pump manufacturer, then reinstall the cover plate.
- Reopen the seacock, start the engine, and check immediately for proper exhaust-water flow and leaks around the pump cover.
Troubleshooting & FAQ
How can I confirm this impeller fits my application?
Match the old impeller or pump reference to the part-number matrix, then verify the complete engine or pump model, drive style, and dimensions. The outer diameter, inner shaft diameter, and width should agree with the existing part.
What are the signs of a failing water-pump impeller?
Common symptoms include engine overheating at idle or low speed, reduced water flow from the exhaust, and cracked, stiff, or missing impeller blades during inspection.
How often should a marine impeller be replaced?
Replacement intervals depend on the engine manufacturer, operating hours, water conditions, and storage conditions. Annual inspection and replacement at the interval specified by the engine or pump manufacturer are prudent maintenance practices.
Does this product include a gasket, O-ring, or impeller puller?
No. The product record identifies this item as an impeller replacement. A gasket, O-ring, seal, and puller tool are not included unless separately specified for the applicable pump.
What is the difference between a neoprene and nitrile impeller?
This impeller is neoprene, a common material for raw-water service. Nitrile impellers are generally selected for applications involving oily or petroleum-contaminated fluids because neoprene can swell or deteriorate when exposed to petroleum products.
Is this an OEM component?
This is an aftermarket replacement. The manufacturer-branded numbers in the matrix are provided as reference and interchange identifiers; the replacement is not represented as an OEM-branded part.
Shipping speed and cost
Standard and expedited shipping options, delivery estimates, and applicable costs are shown at checkout where available.
Warranty and returns
Warranty coverage and return eligibility are governed by the current store policies. Contact support with your order details if you need assistance.
Safety & Important Information
- Verify the part number, dimensions, pump model, drive configuration, and engine application before purchase.
- Do not operate the engine without confirming that the raw-water intake is open and that cooling-water flow is present.
- This is an aftermarket replacement, not an OEM-branded component.
- Professional installation is recommended when pump or engine service procedures are unfamiliar.
About Sea Sierra
- Pro-Grade Standards — Marine replacement parts selected for dependable service in real-world operating conditions.
- Global Fulfillment — Shipping options and delivery estimates are provided at checkout.
- Manufacturer-Direct Value — Practical replacement parts at competitive pricing.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
