Keeping your 5.9 Cummins engine cool is critical for performance and longevity. A failing water pump can lead to overheating and costly repairs, so choosing the right replacement matters.
This guide reviews five water pumps compatible with 5.9 Cummins and related engines. We break down each option’s fitment, materials, and key features to help you make an informed decision for your truck, equipment, or marine application.
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ZYSDNMW 5263374 Water Pump – Versatile Fit
Brand: ZYSDNMW
A versatile option for various Cummins engines needing a reliable coolant pump.
The ZYSDNMW water pump covers a wide range of Cummins engines, including the 6B5.9, ISF3.8, and QSX15. With part numbers 5288908, 5333035, 5257960, and 5333149, it’s designed to match multiple OEM specs. This pump’s core function is to pressurize and circulate coolant, ensuring your engine stays at the right temperature under load.
You get a single pump in the box, ready to install. The build quality focuses on reliable liquid transfer, which is essential for preventing hot spots in your 5.9 Cummins. If you need a straightforward replacement that fits a broad range of Cummins diesel engines, this model is a solid contender.
- Covers many Cummins models
- Matches multiple OEM part numbers
- Simple, direct replacement
- Limited brand information
- No gasket included
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- 【Part number】5288908, 5333035, 5257960, 5263374, 5333149.
- 【Fitment】Fit for Cummins Engine ISF3.8 6B5.9 B4.0 B4.5 D4.5 F3.8 F4.5 ISB4.5 QSB4.5 QSX15.
- 【Package Includes】1X 5263374 Water Pump.
- 【Function】The core function of a mechanical water pump is to transport or pressurize liquids. It transfers the mechanical energy of the prime mover to the liquid, increasing its energy (manifested as pressure or velocity), thereby achieving the movement or lifting of the liquid.
- 【Note】Before placing an order, please compare its appearance, shape, and size with your original equipment to ensure it is suitable for your machine.
Zuide Water Pump 3928396 – Direct Fit for 5.9
Brand: Zuide
A precise fit for 5.9 Cummins engines when you confirm part numbers.
Zuide offers a water pump specifically for Cummins QSB 5.9, ISB5.9, 4B4.5, 4BT3.9, and 6BT5.9 engines. The part numbers 3928396, 3913432, 3927015, and 3928395 ensure you’re getting a unit that matches factory specifications. This pump is built to handle the cooling demands of your 5.9 Cummins, whether in a truck or industrial application.
Before purchasing, you should verify the product pictures and part numbers against your existing pump to guarantee fitment. The design focuses on delivering consistent coolant flow to keep engine temperatures stable. If you want a pump tailored to the 5.9 family, this Zuide model is worth considering.
- Targeted for 5.9 engines
- Multiple part number cross-references
- Easy to verify fitment
- Fitment verification required
- No extra hardware included
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- Item name:Water Pump
- Part number:3928396 3913432 3927015 3928395
- For Cummins QSB 5.9 ISB5.9 4B4.5 4BT3.9 6BT5.9
- Please make sure that the product pictures and partnumbers are correct to avoid the parts you purchase not being suitable for your machine
- If you are not sure that the parts are suitable for your machine please take pictures of your originalparts for us and we will help you confirm
maXpeedingrods Water Pump – Durable Aluminum Build
Brand: maXpeedingrods
A durable aluminum pump ideal for demanding applications and better cooling.
The maXpeedingrods water pump is built for Cummins 4BT5.9 and 6BT5.9 engines, as well as Komatsu excavators like the PC300 and PC200. It replaces part numbers 3960342, 3903749, and 4429404, among others. The pump is made from high-quality aluminum, which offers better durability and a longer service life compared to lesser materials.
This aluminum construction helps dissipate heat more effectively, keeping your engine at optimal temperatures. The pump also controls coolant flow more precisely, improving overall cooling efficiency. If you need a robust pump for heavy-duty use, the maXpeedingrods unit provides the strength and thermal performance required.
- High-quality aluminum build
- Improved heat dissipation
- Precise coolant flow control
- May not fit all 5.9 variants
- Heavier than some alternatives
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- 【Application】This engine water pump fits for Cummins 4BT5.9 6BT5.9 Water Pump, for Komatsu PC300-6/7/8 R220-5 6D102 PC200-6 Water Pump, for R220-5 6D102 PC200-6 Excavator 4BT5.9 6BT5.9 A3960342 Water Pump 6735-61-1500
- 【Part number】3960342,3903749, 4429404, 4886589, 5003665AA, R4723690, 3913432, 3960309，3802004，3802971, 3286275, 12493953, 3802358，41176HD
- 【Premium Material】Made of high-quality aluminum, it is more durable and has a longer service life. It keeps the engine at the optimal temperature and helps dissipate heat
- 【Function】The water pump controls the coolant flow more precisely. This improves engine cooling efficiency and ensures optimal cooling performance at all times
- 【24/7 Customer Support】maXpeedingrods offers lifetime technical support and a 1-year limited warranty for quality-related issues since the date of purchase. Feel free to contact us if you have any questions
HOLDWELL Water Pump 5288908 – Reliable Replacement
Brand: HOLDWELL
A dependable, no-frills replacement for many Cummins engine models.
HOLDWELL provides a water pump compatible with Cummins engines including ISF3.8, 6B5.9, B4.0, and QSX15. It uses part numbers 5288908, 5333035, 5257960, 5263374, and 5333149, making it a direct swap for many OEM units. The package includes one water pump, ready for installation on your 5.9 Cummins or similar engine.
This pump is designed to restore proper coolant circulation, preventing overheating during long hauls or heavy workloads. The build quality focuses on reliability and consistent performance. If you need a no-fuss replacement that matches multiple OEM references, the HOLDWELL pump is a practical choice.
- Matches multiple OEM numbers
- Simple installation
- Reliable coolant circulation
- Basic packaging
- No installation guide included
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- Part Name: Water Pump
- Part Number: 5288908 5333035 5257960 5263374 5333149
- Application: For Cummins Engine ISF3.8 6B5.9 B4.0 B4.5 D4.5 F3.8 F4.5 ISB4.5 QSB4.5 QSX15
- Package includes: 1× Water Pump
- We will try our best to provide a great quality service and a nice shopping experience. If you have any questions, please feel free to contact us. Thanks!
SOXAMARINE 23-3305 Impeller Kit – Marine Use
Brand: SOXAMARINE
A comprehensive impeller kit for marine generator cooling systems.
The SOXAMARINE 23-3305 is a raw sea water pump impeller repair kit designed for Cummins Onan marine generators. It fits models like 5.0 MDKUB, 6.0 MDKOB, and 9.0 MDKOB, as well as Johnson pumps. The kit includes an impeller, cover gasket, seal, screw, and oil seals, providing everything you need for a complete rebuild.
This kit is specifically for marine applications where raw water cooling is used. It replaces Sierra 23-3305 and other OEM numbers, ensuring compatibility with your Cummins Onan generator. If you own a boat with a 5.9 Cummins generator, this impeller kit keeps your cooling system running smoothly.
- Complete rebuild kit included
- Fits multiple Onan models
- Replaces Sierra 23-3305
- Not for engine water pump
- Marine application only
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- Marine Boat Generator Engine Cooling Raw Sea Water Pump Impeller Repair Service Kit 132-0310, 0132-0310, 132-0311.
- Compatible with Cummins Onan Marine 5.0 MDKUB 5.5 MDKUB 6.0 MDKOB 6.5 MDKUB 7.5 MDKOB 9.0 MDKOB 9KW raw cooling water pumps.
- Fits Cummins Onan Marine Pump 132-0336, 0132-0336 and Johnson 10-35211-5.
- This impeller repair kit include Water Pump Impeller 132-0310, Pump Cover Gasket 132-0309, 132-0301 Seal, Screw 132-0312 and oil seals. Sierra 23-3305, 18-3510
- SoxaMarine here you can find all sea water pump replacement service kit, anywhere need us, let me know.
Buyer’s Guide: What to Consider
Choosing the right water pump for your 5.9 Cummins involves checking fitment, materials, and included parts. Here are key factors to consider.
- Engine Compatibility: Ensure the water pump matches your specific Cummins engine model, such as 6B5.9 or ISB5.9, to guarantee proper fitment.
- Part Number Cross-Reference: Compare the pump's part numbers with your OEM unit to confirm it's a direct replacement for your application.
- Material Quality: Aluminum pumps offer better durability and heat dissipation than cheaper alternatives, extending service life.
- Included Components: Check if the pump comes with gaskets or seals. Some kits include everything needed, while others require separate purchases.
- Application Type: Consider whether you need a pump for automotive, industrial, or marine use, as each has specific cooling requirements.
Conclusion
Selecting the best water pump for your 5.9 Cummins depends on your specific engine model and application. The ZYSDNMW and HOLDWELL pumps offer broad compatibility, while the Zuide and maXpeedingrods options provide targeted fitment and durable construction.
For marine generator cooling, the SOXAMARINE impeller kit is the right choice. Always verify part numbers and engine compatibility before purchasing to ensure a smooth installation and reliable cooling performance.