Impeller Repair Kit – Fits Oberdorfer 202M-11 & N202M Series (Replaces Onan 132-0277, Westerbeke 17556)
Impeller Repair Kit – Fits Oberdorfer 202M-11 & N202M Series (Replaces Onan 132-0277, Westerbeke 17556) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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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.
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Impeller Repair Kit – Fits Oberdorfer 202M-11 & N202M Series (R...
Impeller Repair Kit – Fits Oberdorfer 202M-11 & N202M Series (Replaces Onan 132-0277, Westerbeke 17556) is backordered and will ship as soon as it is back in stock.
Product Details
This Impeller Repair Kit – Fits Oberdorfer 202M-11 & N202M Series Pumps (Replaces Onan 132-0277, Westerbeke 17556) contains the necessary components to service Oberdorfer 202M-11, N202M-03, N202M-7, N202M-11, N202M-15, and N202M-16 pumps. These pumps are commonly found on a variety of marine engines and generators for raw water cooling applications.
This kit provides direct replacements for Onan 132-0277/132-0316, Westerbeke 17556, Universal 200209/295628, and Globe 815 part numbers.
- Installation: Designed as a direct replacement for listed pump models.
- Impeller Material: Made from durable neoprene for reliable performance in water and coolant.
- Essential Components: Includes the impeller, gasket, and O-ring required for a standard service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number | Notes |
|---|---|---|
| Onan | 132-0277 | Kit |
| Onan | 132-0316 | Impeller Only |
| Onan | 132-0315 | Gasket Only |
| Westerbeke | 17556 | Kit |
| Universal | 200209 | Kit |
| Universal | 295628 | Kit |
| Globe | 815 | Kit |
| Oberdorfer | 6593 | Impeller Only |
| Oberdorfer | 6599 | Gasket Only |
Engine & Model Compatibility
Confirm your engine model or pump model in the tables below.
This kit is compatible with specific Onan generator models that use the corresponding service pumps.
| Brand | Model | Rated KW | OEM Part No. |
|---|---|---|---|
| Onan | MDKC | 3.5-4.0 KW | 132-0277 |
| Onan | MDKD | 6.5-8.0 KW | 132-0277 |
It is designed to service the following Oberdorfer pumps directly.
| Brand | Model | OEM Part No. | Notes |
|---|---|---|---|
| Oberdorfer | 202M-11 | OB6593 | Impeller only |
| Oberdorfer | N202M-03 | OB6593 | Impeller only |
| Oberdorfer | N202M-7 | OB6593 | Impeller only |
| Oberdorfer | N202M-11 | OB6593 | Impeller only |
| Oberdorfer | N202M-15 | OB6593 | Impeller only |
| Oberdorfer | N202M-16 | OB6593 | Impeller only |
Technical Specs
- Product Type
- Impeller Repair Kit
- Installation
- Direct replacement
- Impeller Dimensions
- Width: 22mm (7/8"), Diameter: 51mm (2")
- Fitting Type
- 1/2" D Shaft
- Impeller Material
- Neoprene
- Impeller Blade Count
- 6
What’s in the Box
- 1 x Impeller (Replaces Oberdorfer 6593, Onan 132-0316)
- 1 x Gasket (Replaces Oberdorfer 6599, Onan 132-0315)
- 1 x O-ring (Replaces 9797-034)
Installation Notes
- Ensure the engine is off and cool. Close the raw water seacock.
- Place an absorbent towel under the pump to catch any spilled coolant.
- Loosen the screws and remove the pump's cover plate.
- Note the orientation of the impeller blades before removal. This helps ensure the new one is installed correctly.
- Use impeller pullers or two flat-head screwdrivers to gently pry the old impeller out of the housing. Avoid scratching the housing walls.
- Clean the inside of the pump housing, the cover plate, and the gasket surfaces. Remove any old gasket material or debris.
- Install the new O-ring or gasket included in the kit.
- Lubricate the new impeller with a small amount of water-based lubricant or liquid soap, then install it into the housing, bending the blades in the correct direction.
- Reinstall the cover plate and tighten the screws evenly in a star pattern.
- Open the seacock, start the engine, and immediately check the pump for leaks.
Troubleshooting & FAQ
How do I confirm this kit fits my pump?
The best way is to verify your pump model number against our compatibility list (e.g., Oberdorfer 202M-11) or cross-reference an existing OEM part number from your old kit (e.g., Onan 132-0277). Also, compare the impeller dimensions (51mm diameter, 22mm width) with your current part.
What are the signs of a failing impeller?
Common symptoms include engine overheating at idle or low speeds, a noticeable reduction in water flow from the exhaust, and visible cracks or missing blades on the impeller itself upon inspection. A stiff or swollen impeller also indicates it's time for replacement.
How often should I replace my impeller?
As a general rule, impellers should be inspected annually and replaced every 1 to 2 years, depending on usage hours and water conditions (sandy or silty water causes faster wear). It's wise to replace it as part of your regular pre-season maintenance routine.
Can I reuse my old gasket or O-ring?
No. This kit includes a new gasket and O-ring because the old ones can become compressed, brittle, or torn during removal, leading to leaks if reused. Always use the new seals provided.
Is this impeller resistant to fuel or oil?
This impeller is made of neoprene, which is designed for pumping water and engine coolant. It is not intended for pumping fuel or oil, as petroleum products can cause the neoprene to swell and degrade quickly.
What is the difference between this kit and the OEM version?
Functionally, there is no difference. Our aftermarket kit is designed to meet or exceed OEM specifications for fit, materials, and performance. It offers a cost-effective alternative to the original manufacturer's part without compromising reliability.
What if I buy the wrong part?
We accept returns for unused items in their original condition within our standard return period. To avoid errors, please double-check your engine or pump model and cross-reference part numbers before ordering. If you are unsure, contact our support team for assistance.
How fast do you ship?
We ship worldwide from our closest warehouse to ensure fast delivery, with typical transit times of 5–15 days for standard shipping. Expedited shipping options are available at checkout for most regions.
What is the warranty on this part?
This product is covered by a 1-year warranty against manufacturing defects under normal use conditions. If you experience an issue, contact our customer support with your order number and a description of the problem for assistance.
Safety & Important Info
- Verify images and specifications against your original part before purchasing. If any details differ—even if your model is listed as compatible—do not order.
- This product is an aftermarket replacement part, not an original equipment manufacturer (OEM) component.
- Professional installation is strongly recommended to ensure safety, proper function, and optimal performance.
About Sea Sierra
- Pro-Grade Standards — We supply high-quality marine parts engineered to meet or exceed OEM-level tolerances and rigorously tested for real-world reliability.
- Fast Global Fulfillment — With warehouses worldwide, we offer free standard delivery to most regions in 5–15 days, getting you back on the water faster.
- Manufacturer-Direct Value — By working directly with manufacturers, we provide fair, competitive pricing without compromising on materials or quality control.
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