Johnson Pump Impeller 09-806B-1 – Fits Volvo Penta, Yanmar Small Diesels (Replaces 3586494, 876689)
Johnson Pump Impeller 09-806B-1 – Fits Volvo Penta, Yanmar Small Diesels (Replaces 3586494, 876689) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Free standard shipping on all orders under 1 KG
Johnson Pump Impeller 09-806B-1 – Fits Volvo Penta, Yanmar Small Di...
Product Details
This high-performance Johnson Pump Impeller 09-806B-1 is an essential service part for maintaining your vessel's engine cooling system. It is designed for a wide range of small diesel engines, primarily fitting Volvo Penta 1.9–2.9L models from 1970–2005 and various Yanmar 1–3 cylinder diesels (like the 2GM, 3GM, and YSM series) from the 1980s–2000s.
This impeller serves as a direct replacement for multiple part numbers, including Volvo Penta 3586494 and 876689, Yanmar 104211-42070, Jabsco 4528-0001-P, Perkins 24880272, and Onan 132-0859.
- Engineered from MC97, an environmentally improved neoprene compound that provides an extended service life.
- Installation is straightforward; use the included lubricant or dish soap to fit the impeller into the pump housing.
- The kit includes the flexible impeller, a gasket, and lubricant gel for a complete service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Johnson | 09-806B-1 |
| Volvo Penta | 3580029 |
| Volvo Penta | 3586494 |
| Volvo Penta | 875807 |
| Volvo Penta | 876689 |
| Jabsco | 4528-0001-P |
| Jabsco | 4528-0003-P |
| Yanmar | 104211-42070 |
| Perkins | 24880272 |
| Onan | 132-0859 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This impeller fits various small diesel Volvo Penta engines, including models from the MD, AQD, and 2000 series. Check your serial number for compatibility, especially on MD1, MD2, and MD21A models.
| Brand | Model | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|
| Volvo Penta | 2003T | 4-Stroke | 3586494 | |
| Volvo Penta | 2010 (up to serial #5101203008) | 4-Stroke | 3586494 | |
| Volvo Penta | 2020 (up to serial #5101309052) | 4-Stroke | 3586494 | |
| Volvo Penta | AQ2B | 4-Stroke | 3586494 | Gasoline engine |
| Volvo Penta | AQD2B | 4-Stroke | 3586494 | |
| Volvo Penta | MD1, MD1B | 4-Stroke | 3586494 | MD1 from serial #14016+ |
| Volvo Penta | MD2, MD2B | 4-Stroke | 3586494 | MD2 from serial #4211+ |
| Volvo Penta | MD6 | 4-Stroke | 3586494 | |
| Volvo Penta | MD2010A, B, C, D | 4-Stroke | 3586494 | |
| Volvo Penta | MD2020A, B, C, D | 4-Stroke | 3586494 | |
| Volvo Penta | MD21A, MD21B | 4-Stroke | 3586494 | Up to serial #103386 |
| Volvo Penta | MD22A, MD22L-A, MD22L-B | 4-Stroke | 3586494 | |
| Volvo Penta | TAMD22P-B | 4-Stroke | 3586494 | |
| Volvo Penta | TMD22A, TMD22B | 4-Stroke | 3586494 | |
| Volvo Penta | AQD21A, AQD21B | 4-Stroke | 3586494 |
Commonly used in small Yanmar marine diesels from the GM, SB, YSB, YSE, and YSM series.
| Brand | Model | Rated HP | Stroke | OEM Part No. |
|---|---|---|---|---|
| Yanmar | 2GM, 2GM20, 3GM | 4-Stroke | 104211-42070 | |
| Yanmar | SB8, SB12 | 8, 12 | 4-Stroke | 104211-42070 |
| Yanmar | YSB8, YSB12 | 8, 12 | 4-Stroke | 104211-42070 |
| Yanmar | YSE8, YSE12 | 8, 12 | 4-Stroke | 104211-42070 |
| Yanmar | YSM8, YSM12 | 8, 12 | 4-Stroke | 104211-42070 |
Also found in various auxiliary engines from brands like Perkins, Onan, Bukh, and others.
| Brand | Model | Stroke | OEM Part No. |
|---|---|---|---|
| Arona | AD 185M, AL 186 | 4-Stroke | |
| ARS Marine | Mini D600 | 4-Stroke | |
| Bukh | DV10, DV20, DV20M | 4-Stroke | |
| Farymann | DS, ES, GS, K30M | 4-Stroke | |
| Herald Marine | 2:12, 3.18/22 | 4-Stroke | |
| Iveco | 514, 600 | 4-Stroke | |
| Nanni | K.L.A. | 4-Stroke | |
| Onan | 4-Stroke | 132-0859 | |
| Perkins | M20 Perama | 4-Stroke | 24880272 |
| Tempest | Vedette 25 MkII, Vedette 25 MkVI | 4-Stroke |
Technical Specs
- Product Type
- Flexible Impeller for Raw Water Pump
- Material
- MC97 (Environmentally Improved Neoprene)
- Impeller Dimensions
- 40mm × 19mm (1.58" × 0.75")
- Shaft Diameter
- 9.5mm (0.37")
- Impeller Blades
- 6
- Drive Type
- Through Pin Drive
- Weight
- 0.05 kg (0.11 lb)
- Other Technical Attributes
- Extended service life compared to standard neoprene
What’s in the Box
- 1 x Flexible Impeller (09-806B-1)
- 1 x Gasket
- 1 x Lubricant Gel
- 1 x Instruction Manual
Installation Notes
- Close the water intake seacock to prevent water from entering the vessel.
- Access the raw water pump and remove the cover plate screws to expose the old impeller.
- Remove the old impeller using pliers or an impeller puller tool. Note the direction the blades are bent.
- Clean the pump housing interior and the cover plate, ensuring the sealing surfaces are free of old gasket material or debris.
- Place the new gasket on the pump body.
- Apply the supplied lubricant (or a small amount of dish soap) to the inside of the pump housing and onto the new impeller.
- Insert the new impeller, bending the blades in the same direction as the old one was installed. Squeeze the blades and rotate the impeller shaft to ease insertion.
- Reinstall the cover plate and tighten the screws evenly in a crisscross pattern. Do not overtighten.
- Re-open the water intake seacock before starting the engine.
- Once the engine is started, check for leaks around the pump cover immediately.
Troubleshooting & FAQ
How do I confirm this impeller fits my specific engine?
The best way is to match your old part number to one listed in our Part Number Matrix. If you don't have the old part number, use the Engine & Model Compatibility tables. Pay close attention to model years and serial number breaks, as manufacturers often change parts mid-cycle.
What is the difference between MC97 neoprene and standard rubber?
MC97 is a specialized neoprene compound designed for marine use that offers superior resistance to heat, abrasion, and chemicals compared to standard neoprene. This results in a longer operational life, especially in demanding raw water cooling applications.
How often should I replace my raw water pump impeller?
As a general rule, impellers should be inspected annually and replaced every 1-2 years or every 100-200 engine hours, whichever comes first. However, if you operate in silty or sandy water, more frequent replacement may be necessary.
What are the signs of a failing impeller?
Common signs include a gradual increase in engine operating temperature, reduced water flow from the exhaust outlet, visible cracks on the impeller blades (during inspection), and brittle or permanently bent blades.
Can I run the pump dry with this impeller?
No. Never run a raw water pump dry. The impeller requires water for lubrication. Running it dry for even a short period can cause overheating and rapid destruction of the impeller blades, leading to pump failure and potential engine damage.
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.
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