Water Pump Impeller – Fits Yanmar 2GM/3GM Series, Jabsco, Johnson (Replaces 128990-42200)
Water Pump Impeller – Fits Yanmar 2GM/3GM Series, Jabsco, Johnson (Replaces 128990-42200) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Water Pump Impeller – Fits Yanmar 2GM/3GM Series, Jabsco, Johnson (...
Product Details
This high-performance neoprene Water Pump Impeller – Fits Jabsco, Johnson, Yanmar 2GM/3GM Series (Replaces 128990-42200) is an essential component for your marine engine's cooling system. Specifically designed for Yanmar 2GM20 and 3GM30 series engines (1981–2003), it also serves as a reliable replacement for a wide range of Jabsco and Johnson marine pumps.
It provides a direct interchange for Yanmar 128990-42200, Jabsco 18653-0001, Johnson 09-810B, Sierra 18-45713, and others, ensuring broad compatibility for engine maintenance and repair.
- Engineered for internal engine cooling pumps.
- Features a 6-blade design with a brass insert for durability.
- Connects via a slotted shaft pin drive for secure installation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yanmar | 128990-42200 |
| Jabsco | 18653-0001 |
| Jabsco | 18653-0001-P |
| Johnson | 09-810B |
| Johnson | 09-810B-1 |
| Sierra | 18-45713 |
| Mallory | 9-45713 |
| Volvo | 876097 |
| CEF | 500101 |
| JMP | 7050-01 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Fits various Yanmar diesel engines, including the 2GM, 2YM, 3GM, and 3YM series, as a direct replacement for OEM part 128990-42200.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Yanmar | 2GM20-YEU | 20 | 4-Stroke | 1981–2003 | 128990-42200 |
| Yanmar | 2GM20C-YEU | 20 | 4-Stroke | 1981–2003 | 128990-42200 |
| Yanmar | 2GM20F-YEU | 20 | 4-Stroke | 1981–2003 | 128990-42200 |
| Yanmar | 2GM20FC-YEU | 20 | 4-Stroke | 1981–2003 | 128990-42200 |
| Yanmar | 2YM15 | 15 | 4-Stroke | 2000–2010 | 128990-42200 |
| Yanmar | 3GM30-YEU | 30 | 4-Stroke | 1981–2003 | 128990-42200 |
| Yanmar | 3GM30C-YEU | 30 | 4-Stroke | 1981–2003 | 128990-42200 |
| Yanmar | 3GM30F-YEU | 30 | 4-Stroke | 1981–2003 | 128990-42200 |
| Yanmar | 3GM30FC-YEU | 30 | 4-Stroke | 1981–2003 | 128990-42200 |
| Yanmar | 3YM20 | 20 | 4-Stroke | 2000–2010 | 128990-42200 |
| Yanmar | 3YM27A | 27 | 4-Stroke | 2000–2010 | 128990-42200 |
| Yanmar | 3YM30 | 30 | 4-Stroke | 2000–2010 | 128990-42200 |
| Yanmar | 3YM30R | 30 | 4-Stroke | 2000–2010 | 128990-42200 |
Compatible with a wide array of Jabsco engine cooling pumps, replacing OEM part 18653-0001.
| Brand | Model | OEM Part No. | Notes |
|---|---|---|---|
| Jabsco | 29440-1001 | 18653-0001 | Engine Cooling Pump |
| Jabsco | 29440-1051 | 18653-0001 | Engine Cooling Pump |
| Jabsco | 29440-1101 | 18653-0001 | Engine Cooling Pump |
| Jabsco | 29440-1201 | 18653-0001 | Engine Cooling Pump |
| Jabsco | 29450-1601 | 18653-0001 | Engine Cooling Pump |
| Jabsco | 29450-1641 | 18653-0001 | Engine Cooling Pump |
| Jabsco | 29450-1701 | 18653-0001 | Engine Cooling Pump |
| Jabsco | 29450-1801 | 18653-0001 | Engine Cooling Pump |
| Jabsco | 29460-1001 | 18653-0001 | Engine Cooling Pump |
| Jabsco | 29460-1041 | 18653-0001 | Engine Cooling Pump |
| Jabsco | 29460-1051 | 18653-0001 | Engine Cooling Pump |
| Jabsco | 29460-1101 | 18653-0001 | Engine Cooling Pump |
| Jabsco | 29460-1201 | 18653-0001 | Engine Cooling Pump |
| Jabsco | 29460-1251 | 18653-0001 | Engine Cooling Pump |
| Jabsco | 29460-1261 | 18653-0001 | Engine Cooling Pump |
| Jabsco | 29460-1301 | 18653-0001 | Engine Cooling Pump |
| Jabsco | 29460-1401 | 18653-0001 | Engine Cooling Pump |
| Jabsco | 29460-1431 | 18653-0001 | Engine Cooling Pump |
| Jabsco | 29460-1631 | 18653-0001 | Engine Cooling Pump |
| Jabsco | 29460-1701 | 18653-0001 | Engine Cooling Pump |
| Jabsco | 51520-2001 | 18653-0001 | Engine Cooling Pump |
| Jabsco | Multiple other pump models | 18653-0001 | Contact manufacturer for specific model compatibility |
Replaces Johnson Pump part 09-810B in F4B and other pump models.
| Brand | Model | OEM Part No. | Notes |
|---|---|---|---|
| Johnson | F4B | 09-810B | Engine Cooling Pump |
| Johnson | 10-24509-01 | 09-810B | Engine Cooling Pump |
| Johnson | 10-24509-02 | 09-810B | Engine Cooling Pump |
Also compatible with numerous Westerbeke engines as a replacement for OEM part 33636.
| Brand | Model | Rated HP | Stroke | OEM Part No. |
|---|---|---|---|---|
| Westerbeke | 4.0BCD | 4.0 | 4-Stroke | 33636 |
| Westerbeke | 4.4BCD | 4.4 | 4-Stroke | 33636 |
| Westerbeke | 4.4WMD | 4.4 | 4-Stroke | 33636 |
| Westerbeke | 5.0BCDA | 5.0 | 4-Stroke | 33636 |
| Westerbeke | 5.0BCDB | 5.0 | 4-Stroke | 33636 |
| Westerbeke | 6.0BCD | 6.0 | 4-Stroke | 33636 |
| Westerbeke | 7.6BTD | 7.6 | 4-Stroke | 33636 |
| Westerbeke | 7.7WMD | 7.7 | 4-Stroke | 33636 |
| Westerbeke | 8.0BTD | 8.0 | 4-Stroke | 33636 |
| Westerbeke | 8.0BTDA | 8.0 | 4-Stroke | 33636 |
| Westerbeke | 8.0WMD | 8.0 | 4-Stroke | 33636 |
| Westerbeke | 10.0BTD | 10.0 | 4-Stroke | 33636 |
| Westerbeke | 10.0BTDA | 10.0 | 4-Stroke | 33636 |
| Westerbeke | 11.0BTD | 11.0 | 4-Stroke | 33636 |
| Westerbeke | 11.0WMD | 11.0 | 4-Stroke | 33636 |
| Westerbeke | 12.5BTD | 12.5 | 4-Stroke | 33636 |
| Westerbeke | 12.5BTDA | 12.5 | 4-Stroke | 33636 |
| Westerbeke | 12.5BTDB | 12.5 | 4-Stroke | 33636 |
| Westerbeke | 12.5WMD | 12.5 | 4-Stroke | 33636 |
Technical Specs
- Product Type
- Water Pump Impeller (Flexible Impeller)
- Installation
- Internal Engine Cooling Pump
- Connection
- Slotted Shaft Pin Drive
- Dimensions
- Diameter: 51 mm (2"), Width: 22 mm (7/8"), Shaft: 12 mm (15/32")
- Fitting Type
- Internal Engine Cooling Pump Impeller
- Other Technical Attributes
- 6 Blades, Brass Insert, Neoprene Material
What’s in the Box
- 1 x Impeller (128990-42200)
Installation Notes
- Shut off the engine and allow it to cool completely. Close the raw water seacock.
- Access the water pump housing, typically by removing a cover plate held by several screws.
- Once the cover is off, carefully grip the old impeller with pliers or an impeller puller and extract it from the housing.
- Thoroughly clean the inside of the pump housing, removing any debris, salt deposits, or broken impeller blades.
- Lightly lubricate the new impeller and the interior surfaces of the pump housing with a water-based lubricant or glycerin.
- Insert the new impeller, rotating the driveshaft in the engine's normal direction of operation to correctly bend the blades.
- Install the new gasket (if applicable) and replace the pump cover.
- Tighten the cover screws in a star pattern to ensure an even seal. Do not overtighten.
- Open the raw water seacock.
- Start the engine and immediately check the pump for any leaks and verify that water is flowing from the exhaust outlet.
Troubleshooting & FAQ
How do I know if this impeller fits my engine?
The best way to confirm fitment is to check your engine's service manual for the correct impeller part number. You can also compare the part numbers listed in our "Part Number Matrix" and "Engine & Model Compatibility" tables against your existing part or manual.
What are the signs of a failing water pump impeller?
Common signs include higher-than-normal engine temperatures, a reduced flow of water from the exhaust outlet, and visible cracks or missing blades on the impeller itself upon inspection. A complete failure can lead to rapid overheating.
How often should I replace my impeller?
As a general rule, impellers should be inspected annually and replaced every 1-2 years, or after every 200-300 hours of engine use, depending on operating conditions. More frequent replacement may be necessary in silty or sandy water.
Can I reuse the old gasket or O-ring?
It is strongly recommended to use a new gasket and O-ring during every impeller change to ensure a proper, leak-free seal. Reusing old seals can lead to leaks and pump inefficiency.
What should I use to lubricate the new impeller during installation?
Use a water-based lubricant or glycerin. Avoid using petroleum-based products like grease or oil, as they can cause the neoprene material to deteriorate over time.
The blades on my old impeller were bent. Is that normal?
Yes, it is normal for the flexible blades to be bent from being seated inside the pump housing. However, you should inspect for blades that are cracked, torn, stiff, or permanently set in their bent position, as these are signs the impeller needs replacement.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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