Water Pump Impeller Kit – Fits Kohler Marine Generators 4-8HP (Replaces Kohler 359978, Sherwood 8000K, Sierra 23-3314)
Water Pump Impeller Kit – Fits Kohler Marine Generators 4-8HP (Replaces Kohler 359978, Sherwood 8000K, Sierra 23-3314) 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 Kit – Fits Kohler Marine Generators 4-8HP (Repl...
Water Pump Impeller Kit – Fits Kohler Marine Generators 4-8HP (Replaces Kohler 359978, Sherwood 8000K, Sierra 23-3314) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller Kit is a direct replacement component for Kohler Marine Generators in the 4–8 HP range (including 4EF, 5E, 6EF, 7.3E, and 8EFK series) that are factory-equipped with Sherwood G8000, G8001, or G8002 series pumps. It's engineered to restore cooling system performance and prevent engine overheating.
It serves as a direct interchange for several OEM and aftermarket part numbers, including Kohler 359978, Sherwood 8000K, Sierra 23-3314, and Onan 132-0415.
- Designed for direct installation in Sherwood pump models G8001, G8001-1, G8002, G8002-1, G8005, and G8005-1.
- The impeller is made from durable neoprene rubber with a brass hub to resist corrosion in marine environments.
- Installation is straightforward; always lubricate the new impeller with glycerine or silicone grease before fitting.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Kohler | 359978 |
| Sherwood | 8000K |
| Sherwood | 08000K |
| Sierra | 23-3314 |
| Onan | 132-0415 |
| Onan | 541-1524 |
| CEF | 500190 |
| JMP | 7013 |
| DJ Pump | 09-107-0601 |
Engine & Model Compatibility
Confirm your engine model in the table below.
Kohler Marine Generators
Compatible with Kohler generator models that use the GM28487 sea water pump.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Kohler | 4EF | 4 | 4-Stroke | 359978 | Used with GM28487 pump |
| Kohler | 4EFCD | 4 | 4-Stroke | 359978 | Used with GM28487 pump |
| Kohler | 4EFKD | 4 | 4-Stroke | 359978 | Used with GM28487 pump |
| Kohler | 5E | 5 | 4-Stroke | 359978 | Used with GM28487 pump |
| Kohler | 5ECD | 5 | 4-Stroke | 359978 | Used with GM28487 pump |
| Kohler | 5EKD | 5 | 4-Stroke | 359978 | Used with GM28487 pump |
| Kohler | 6EF | 6 | 4-Stroke | 359978 | Used with GM28487 pump |
| Kohler | 6EFCD | 6 | 4-Stroke | 359978 | Used with GM28487 pump |
| Kohler | 6EFKD | 6 | 4-Stroke | 359978 | Used with GM28487 pump |
| Kohler | 7.3E | 7.3 | 4-Stroke | 359978 | Used with GM28487 pump |
| Kohler | 7.3ECD | 7.3 | 4-Stroke | 359978 | Used with GM28487 pump |
| Kohler | 7.5 | 7.5 | 4-Stroke | 359978 | Used with GM28487 pump |
| Kohler | 8EFK | 8 | 4-Stroke | 359978 | Used with GM28487 pump |
Onan Marine Generators
Fits select Onan generators using sea water pumps 132-0395 or 132-0430.
| Brand | Model | OEM Part No. | Notes |
|---|---|---|---|
| Onan | 4MDKBH | 132-0415 | Used with pumps 132-0395 & 132-0430 |
| Onan | 5MDKBH | 132-0415 | Used with pumps 132-0395 & 132-0430 |
Technical Specs
- Product Type
- Water Pump Impeller Kit
- Installation
- Direct replacement for Sherwood pump models G8001, G8001-1, G8002, G8002-1, G8005, G8005-1
- Housing Material
- Brass hub with neoprene rubber impeller
- Dimensions
- Impeller diameter: 40mm (1-9/16"), Width/depth: 19mm (3/4"), Shaft diameter: 12mm (7/16")
- Fitting Type
- Single flat drive / D-slot
- Drive Type
- D-slot 11mm (7/16")
- Number of Blades
- 6
- Other Technical Attributes
- Impeller is constructed with neoprene rubber and brass hub for seawater corrosion resistance
What’s in the Box
- 1 x Impeller (Neoprene with Brass Hub)
- 1 x O-Ring (Nitrile 70)
Installation Notes
- Shut down the generator and disconnect the power source. Close the corresponding water inlet (seacock).
- Place a collection pan under the pump to catch any spilled coolant or water.
- Remove the screws holding the pump cover plate. Carefully pry off the cover if it is stuck.
- Note the rotational direction of the old impeller's blades before removing it. This helps ensure the new one is installed correctly.
- Grip the hub of the old impeller with pliers and pull it straight out.
- Clean the interior of the pump housing and inspect for any scoring or damage.
- Lubricate the inside of the housing and the new impeller with a marine-safe lubricant like glycerine or silicone grease.
- Insert the new impeller, making sure to bend the blades in the same direction as the old one.
- Install the new O-ring, ensuring it is seated correctly, and then reattach the cover plate.
- Open the seacock, reconnect power, and start the generator. Immediately check for proper water flow and inspect for leaks around the pump cover.
Troubleshooting & FAQ
How do I know if this impeller will fit my generator?
First, check the compatibility tables to see if your generator model is listed. This impeller fits specific Kohler and Onan models. Second, you can verify by checking the dimensions of your existing impeller; this part has a diameter of 40mm (1-9/16") and a width of 19mm (3/4").
What are the signs that my impeller has failed?
The most common signs of a failing or worn-out impeller are the engine running hotter than normal, a complete overheating alarm, or a noticeable reduction in water flow from the exhaust outlet. Upon visual inspection, you may find cracked, brittle, or missing blades.
How often should I replace my water pump impeller?
For preventative maintenance, it is recommended to inspect the impeller annually and replace it every one to two years, or every 200-300 hours of operation. Replacement intervals should be shorter in saltwater environments or if your generator is used infrequently.
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 and specifications against 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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