Water Pump Shaft Kit – Fits Volvo Penta MD5, MD6, MD7, MD11 Series (Replaces 21951422)
Water Pump Shaft Kit – Fits Volvo Penta MD5, MD6, MD7, MD11 Series (Replaces 21951422) 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 Shaft Kit – Fits Volvo Penta MD5, MD6, MD7, MD11 Series ...
Product Details
This Water Pump Shaft Kit for Volvo Penta MD5, MD6, MD7, and MD11 Series is a direct-fit replacement for aging or damaged raw water pump shafts. It is designed for a range of classic Volvo Penta diesel engines from the 1960s to the 1980s, including the MD5A/B/C, MD6A/B, MD7A/B, and MD11C/D models, which are commonly found in sailboats as auxiliary engines.
It serves as a direct interchange for Volvo Penta part number 21951422, Orbitrade 15584/ORB15584, and Crom 122197.
- Engineered specifically for water pumps that utilize ball bearings.
- The precision-machined shaft is made from marine-grade 316 stainless steel for superior corrosion resistance.
- Includes essential components for a complete overhaul: shaft, oil seal, lower bushings, and circlip.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 21951422 |
| Orbitrade | 15584/ORB15584 |
| Crom | 122197 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This shaft kit is specifically designed for the following Volvo Penta marine diesel engines. It is critical to ensure your pump uses ball bearings, not the plain bearing/bushing type.
| Brand | Model | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|
| Volvo Penta | MD5A | 4-Stroke | 21951422 | |
| Volvo Penta | MD5B | 4-Stroke | 21951422 | |
| Volvo Penta | MD5C | 4-Stroke | 21951422 | |
| Volvo Penta | MD6A | 4-Stroke | 21951422 | |
| Volvo Penta | MD6B | 4-Stroke | 21951422 | |
| Volvo Penta | MD7A | 4-Stroke | 21951422 | |
| Volvo Penta | MD7B | 4-Stroke | 21951422 | |
| Volvo Penta | MD11C | 4-Stroke | 21951422 | |
| Volvo Penta | MD11D | 4-Stroke | 21951422 | |
| Volvo Penta | MD17 | 4-Stroke | 21951422 | Mentioned in some sources |
Technical Specs
- Product Type
- Water Pump Shaft Kit
- Installation
- Direct replacement for water pumps with ball bearings
- Fuel Type
- Diesel
- Housing Material
- Stainless Steel (316)
- Dimensions
- 19.0"L x 12.2"W x 1.5"H
- Other Technical Attributes
- For pumps with ball bearings (not plain bearing/bishing type)
What’s in the Box
- 1 x Impeller pump shaft (precision machined, 316 stainless steel)
- 1 x Oil Seal (S.S. spring: 833996)
- 2 x Lower bushings
- 1 x Circlip
Installation Notes
- Disconnect the boat's battery and close the engine's raw water seacock.
- Loosen the drive belt and remove the water pump from the engine.
- Disassemble the pump, carefully noting the order and orientation of all components.
- Remove the old shaft, bearings, seals, and circlip.
- Thoroughly clean the pump housing, ensuring all old gasket material and corrosion are removed.
- Press the new bearings and seals into the housing using appropriate tools.
- Install the new shaft, circlip, and other components from the kit.
- Reassemble the water pump with a new impeller and gasket (sold separately).
- Reinstall the pump onto the engine, tighten the drive belt to the correct tension, and reconnect hoses.
- Open the seacock, reconnect the battery, and start the engine to check for leaks and proper operation.
Troubleshooting & FAQ
How do I know if this shaft kit fits my pump?
This kit is exclusively for Volvo Penta pumps that use ball bearings. It will not fit the older style pumps that use plain bearings or bushings. Check your pump model number against known compatible models (833883, 840076) or visually inspect your pump's internals if you are unsure.
Is this kit compatible with the Volvo Penta MD17?
Some sources indicate compatibility with the MD17 engine, while others do not. We recommend you verify the OEM part number for your specific engine is 21951422 before purchasing for an MD17.
What are the signs of a failing water pump shaft?
Common symptoms include water leaking from the pump's weep hole, a noticeable wobble in the pump pulley, grinding or squealing noises from the pump, or recurrent overheating issues even with a new impeller.
How does the 316 stainless steel shaft compare to the original?
The 316 stainless steel construction offers superior corrosion resistance, particularly in saltwater environments, compared to OEM shafts which may use lower-grade stainless steel. This provides enhanced durability and a longer service life.
What tools are needed for installation?
Installation requires standard mechanic's tools, a bearing press or appropriate sockets for seating new bearings and seals, and snap ring pliers for the circlip. Professional installation is recommended if you are not familiar with these procedures.
How often should the shaft and bearings be replaced?
There is no fixed interval. The shaft and bearings are typically replaced when the pump is rebuilt due to leaks or bearing failure. Inspect the shaft for scoring and the bearings for roughness whenever you replace the impeller.
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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