Raw Water Pump Impeller – Fits Yanmar 2GM, 3GM, 2GM20F, 3GM30F and 3HM Series (Replaces 128296-42070, 124223-42091)
Raw Water Pump Impeller – Fits Yanmar 2GM, 3GM, 2GM20F, 3GM30F and 3HM Series (Replaces 128296-42070, 124223-42091) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Raw Water Pump Impeller – Fits Yanmar 2GM, 3GM, 2GM20F, 3GM30F and ...
Raw Water Pump Impeller – Fits Yanmar 2GM, 3GM, 2GM20F, 3GM30F and 3HM Series (Replaces 128296-42070, 124223-42091) is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket raw water pump impeller is designed as a replacement for selected Yanmar marine engines, including the 2GM, 3GM, 2GM20F, 3GM30F and 3HM series. It replaces commonly referenced Yanmar impeller numbers 128296-42070 and 124223-42091. Always compare the impeller dimensions, drive style and existing part number before ordering.
The impeller uses a keyed drive for positive engagement with the pump shaft. It is supplied as a single replacement impeller; a pump-cover gasket, lubricant or other installation accessories are not included unless specifically stated in the order or packaging.
- Flexible impeller for marine raw-water cooling pump applications.
- Key-drive insert for secure shaft engagement.
- Direct replacement design for compatible pump assemblies.
- Suitable for the specific Yanmar applications listed below when the part number and dimensions match.
Part Number Matrix
These references are listed as OEM or aftermarket cross-reference numbers for the compatible impeller application. Cross-reference numbers alone do not replace checking the engine model and pump configuration.
| Brand | Part Number |
|---|---|
| Yanmar | 124223-42091 |
| Yanmar | 124223-42092 |
| Yanmar | 128296-42070 |
| Yanmar | 128620-42200 |
| Jabsco | 22799-0001 |
Engine & Model Compatibility
Use the table below as a fitment guide, then confirm the engine identification plate, pump configuration, existing impeller dimensions and part number before installation. Model families can contain variations, so a model name alone is not sufficient for final verification.
| Brand | Model | OEM Part No. | Fitment Notes |
|---|---|---|---|
| Yanmar | 2GM series | 128296-42070 | Confirm pump configuration and dimensions. |
| Yanmar | 3GM series | 128296-42070 | Confirm pump configuration and dimensions. |
| Yanmar | 2GM20F | 124223-42091 / 124223-42092 | Verify the existing impeller number before ordering. |
| Yanmar | 3GM30F | 124223-42091 / 124223-42092 | Verify the existing impeller number before ordering. |
| Yanmar | 3HM and 3HM35 series | 124223-42091 / 128296-42070 | Confirm the pump and shaft configuration. |
Important: The compatibility information above applies only when the engine uses the corresponding raw-water pump and impeller dimensions. Do not rely on the engine family name alone if the replacement impeller differs from the original.
Technical Specs
- Product Type
- Marine raw water pump impeller
- Installation
- Direct replacement for compatible pump assemblies
- Drive Style
- Key drive
- Impeller Diameter
- 51 mm (approximately 2 in)
- Impeller Width
- 22 mm (approximately 7/8 in)
- Shaft Diameter
- 12.7 mm
- Number of Blades
- 6
- Key Width
- Approximately 5.25 mm
- Impeller Material
- Flexible marine impeller material; material specification may vary by supplied manufacturer
- Approximate Weight
- 0.15 lb (0.068 kg)
What’s in the Box
- 1 × Flexible raw water pump impeller
- Gasket not included
- Lubricant not included
Installation Notes
- Close the raw-water seacock to prevent water from entering the vessel.
- Access the raw-water pump housing and remove the cover-plate screws.
- Carefully remove the old impeller using an impeller puller or suitable hand tools. Avoid scoring the pump housing.
- Clean the pump housing and remove any damaged blade fragments or debris.
- Apply a small amount of lubricant approved for the impeller material and marine raw-water pump use. Do not assume lubricant is included.
- Install the new impeller with the key correctly engaged. Follow the pump manufacturer’s guidance for blade orientation and rotation.
- Replace the cover gasket if the old gasket is damaged or if the pump manufacturer requires a new gasket. A gasket is not included with this impeller.
- Reinstall the cover plate and tighten the screws evenly.
- Open the raw-water seacock.
- Start the engine and immediately check for proper cooling-water flow, leaks and abnormal operating temperature.
Troubleshooting & FAQ
How do I confirm this impeller fits my engine?
Compare the existing impeller’s part number, diameter, width, shaft diameter, blade count and key-drive arrangement with the specifications on this page. Confirm that your engine and pump appear in the compatibility table. If any measurement or drive detail differs, do not install the part without confirming compatibility through the pump or engine service information.
What are the signs of a failing water-pump impeller?
Common symptoms include reduced water flow from the exhaust outlet, higher-than-normal engine temperature, an overheating alarm or visible cracking, hardening, missing blades and other signs of wear. Inspect the pump whenever the cooling-water flow decreases.
How often should I replace the impeller?
Raw-water impellers are preventive-maintenance parts. Many marine service schedules call for annual inspection and replacement at an interval appropriate to operating hours and conditions. Follow the engine and pump manufacturer’s service schedule, and replace the impeller sooner if it shows damage or has run dry.
Does this product include a gasket or lubricant?
No. This listing is for one replacement impeller. A pump-cover gasket and lubricant are not included unless they are specifically identified in the order or supplied packaging.
Is this an OEM part or an aftermarket replacement?
This is an aftermarket replacement impeller, not a Yanmar-branded OEM component. The listed OEM and aftermarket numbers are provided as cross-reference information for fitment checking.
Can I run the pump without water after installation?
No. Avoid running a flexible impeller dry. Open the seacock and ensure the pump is properly lubricated and primed according to the engine or pump manufacturer’s instructions before operating the engine.
What are the shipping speed and cost?
Standard shipping is free to most regions. Typical transit times are 5–15 days, while expedited options, when available for the destination, are shown at checkout.
What is the warranty and return policy?
Returns are subject to the applicable store policy and normally require the item to be unused and in its original condition. Contact support with your order details if the item arrives damaged or if you identify a manufacturing issue.
Safety & Important Information
- Close the raw-water seacock before opening the pump housing.
- Verify the part number, dimensions and key-drive arrangement against the removed impeller.
- Do not operate a flexible impeller dry.
- After installation, check cooling-water flow, pump sealing and engine temperature immediately.
- Professional installation is recommended when the pump or cooling system is difficult to access.
About Sea Sierra
- Marine Replacement Parts — Practical replacement components for maintenance and repair applications.
- Global Fulfillment — Standard delivery is available to most regions, with delivery options shown at checkout.
- Fitment-Focused Support — Use the part-number and dimension information to help verify compatibility before ordering.
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