Water Pump Wear Kit – Fits Volvo Penta MD Series Marine Diesel Engines (Replaces 21951368, 875584)
Water Pump Wear Kit – Fits Volvo Penta MD Series Marine Diesel Engines (Replaces 21951368, 875584) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Water Pump Wear Kit – Fits Volvo Penta MD Series Marine Diesel Engi...
Product Details
This aftermarket Water Pump Wear Kit is designed for a range of Volvo Penta marine diesel engines from the 1980s to the 2000s, including the MD2001, MD2002, MD2003, MD7A, MD7B, MD11C, and MD11D series. It is engineered specifically for the late-design raw water pump (Volvo Penta 840557) that utilizes a ball bearing.
This kit serves as a direct replacement for Volvo Penta part numbers 21951368 and 875584, as well as aftermarket equivalents Sierra 18-3208 and MarinePartSystem 875756.
- Installs as a direct replacement for compatible late-design pumps.
- Engineered for marine diesel environments.
- Contains essential wear components for restoring pump performance.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 21951368 |
| Volvo Penta | 875584 |
| Sierra | 18-3208 |
| MarinePartSystem | 875756 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This kit is confirmed to fit the following Volvo Penta models that use the late-design ball bearing sea water pump (840557).
| Brand | Model | Stroke | OEM Part No. |
|---|---|---|---|
| Volvo Penta | MD2001 | Diesel | 21951368/875584 |
| Volvo Penta | MD2001AG | Diesel | 21951368/875584 |
| Volvo Penta | MD2001B | Diesel | 21951368/875584 |
| Volvo Penta | MD2001BG | Diesel | 21951368/875584 |
| Volvo Penta | MD2002 | Diesel | 21951368/875584 |
| Volvo Penta | MD2002AG | Diesel | 21951368/875584 |
| Volvo Penta | MD2002B | Diesel | 21951368/875584 |
| Volvo Penta | MD2002BG | Diesel | 21951368/875584 |
| Volvo Penta | MD2003 | Diesel | 21951368/875584 |
| Volvo Penta | MD2003AG | Diesel | 21951368/875584 |
| Volvo Penta | MD2003B | Diesel | 21951368/875584 |
| Volvo Penta | MD2003BG | Diesel | 21951368/875584 |
| Volvo Penta | MD1A | Diesel | 21951368/875584 |
| Volvo Penta | MD1B | Diesel | 21951368/875584 |
| Volvo Penta | MD2A | Diesel | 21951368/875584 |
| Volvo Penta | MD2B | Diesel | 21951368/875584 |
| Volvo Penta | MD5A | Diesel | 21951368/875584 |
| Volvo Penta | MD5B | Diesel | 21951368/875584 |
| Volvo Penta | MD5C | Diesel | 21951368/875584 |
| Volvo Penta | MD6B | Diesel | 21951368/875584 |
| Volvo Penta | MD7A | Diesel | 21951368/875584 |
| Volvo Penta | MD7B | Diesel | 21951368/875584 |
| Volvo Penta | MD11C | Diesel | 21951368/875584 |
| Volvo Penta | MD11D | Diesel | 21951368/875584 |
| Volvo Penta | AQD2B | Diesel | 21951368/875584 |
Technical Specs
- Product Type
- Seawater Pump Wear Kit
- Installation
- Direct replacement for late design pumps using ball bearing
- Other Technical Attributes
- Specifically for late-design sea water pumps (840557) using ball bearing
- Dimensions
- 14.0" L x 11.0" W x 5.0" H
What’s in the Box
- Seawater pump wear kit components (21951368)
Installation Notes
- Close the engine's seacock to stop water flow.
- Loosen the hose clamps and remove the inlet and outlet hoses from the pump.
- Remove the bolts securing the pump cover plate. Note the orientation of the plate.
- Carefully pull out the old impeller, noting its rotational direction if possible.
- Remove any old gaskets, seals, and wear plates from the pump housing and cover.
- Clean the interior surfaces of the pump housing and cover plate, ensuring they are free of debris and corrosion.
- Install the new wear components from the kit in the reverse order of removal.
- Lubricate the new impeller with a suitable marine grease or glycerine and insert it into the housing with a twisting motion.
- Reinstall the cover plate with its new gasket and tighten the bolts evenly.
- Reconnect the hoses and tighten the clamps securely.
- Open the seacock and check for any leaks around the pump.
- Start the engine and verify that water is flowing properly from the exhaust.
Troubleshooting & FAQ
How do I know if this kit fits my specific pump?
This kit is exclusively for the late-design Volvo Penta raw water pump (part number 840557), which uses a ball bearing. It will not fit earlier pumps that use a bushing. Please verify your pump's design before ordering.
What are the signs that my water pump wear components need replacing?
Common signs include engine overheating at idle or low speeds, reduced water flow from the exhaust, visible water leaks from the pump housing, or cracks and stiffness in the old impeller upon inspection.
How often should this wear kit be installed?
As a best practice, the impeller and associated wear parts should be inspected annually and replaced at least every two years or every 200 hours of engine operation, whichever comes first. This interval may be shorter in saltwater or high-sediment environments.
Is a special tool required for installation?
No special tools are typically required beyond standard hand tools like screwdrivers and sockets. Impeller pullers can make removing a stuck impeller easier but are not always necessary.
Can I buy the impeller or gasket separately?
This product is sold as a comprehensive wear kit to ensure all critical contact and sealing surfaces are replaced simultaneously for a reliable repair. Individual components may be available elsewhere, but this kit provides a complete service solution.
What's the difference between the early (bushing) and late (ball bearing) pumps?
The primary difference is the internal bearing supporting the pump shaft. This kit is only compatible with the later design that uses a ball bearing, which offers different performance and wear characteristics. Using this kit on a bushing-style pump will result in improper fitment and failure.
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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