A water pump impeller replacement is a crucial maintenance task for boat and marine engines. This impeller is responsible for circulating coolant, preventing overheating, and ensuring optimal engine performance. Regular replacement of the impeller helps maintain the reliability and longevity of marine power systems, such as Perkins and Ancor engines.
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1-2 weeks delivery time The Allpa 500397 impeller offers smooth water delivery with 12 blades and a wide diameter, ideal for steady high-volume flow systems, sized Ø A 20.8 mm, Ø B 56.6 mm, and length 19.8 mm.
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$ 33.51
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1-2 weeks delivery time The Allpa 500306 impeller is designed for outboard applications with 6 blades and a large diameter, delivering powerful and consistent performance, measuring Ø A 19.13 mm, Ø B 89 mm, and length 31.9 mm.
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$ 38.05
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1-2 weeks delivery time The Allpa 500390 impeller is an outboard model featuring 6 blades and balanced dimensions for reliable marine propulsion and cooling, sized Ø A 21 mm, Ø B 57.2 mm, and length 29.6 mm.
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$ 26.01
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1-2 weeks delivery time The Allpa 500307 impeller is engineered for outboard motors with six blades for optimal performance, measuring Ø A 19.25 mm, Ø B 91.5 mm, and length 25.4 mm.
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$ 34.23
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1-2 weeks delivery time The Allpa 500356 impeller, designed for outboard use, provides reliable operation with a six-blade configuration and dimensions of Ø A 22.3 mm, Ø B 109.5 mm, and length 24.8 mm.
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$ 29.92
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1-2 weeks delivery time The Allpa 500305 is a six-blade impeller designed for outboard engines, ensuring consistent cooling and water flow with dimensions Ø A 22.3 mm, Ø B 89 mm, and length 31.9 mm.
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$ 29.43
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1-2 weeks delivery time The Allpa 500388 impeller is compact and durable, featuring six blades for efficient water movement in outboard engines, with Ø A 20.3 mm, Ø B 65.75 mm, and length 35.2 mm.
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$ 41.77
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1-2 weeks delivery time Ideal for small outboard applications, the Allpa 500284 impeller has six blades and comes with a gasket for easy installation, measuring Ø A 7.4 mm, Ø B 35.4 mm, and length 12.8 mm.
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$ 29.76
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1-2 weeks delivery time The Allpa 500190 is a compact six-blade impeller for outboard engines that includes a gasket for convenient replacement, with dimensions Ø A 12.2 mm, Ø B 40 mm, and length 19 mm.
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$ 38.09
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1-2 weeks delivery time Designed for outboard motors, the Allpa 500109 impeller features eight blades with a robust construction to optimize water flow and performance, measuring Ø A 16.85 mm, Ø B 66.5 mm, and length 50.6 mm.
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$ 49.85
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1-2 weeks delivery time The Allpa 500377 outboard impeller has six blades and compact dimensions aimed at effective propulsion, with Ø A 10.25 mm, Ø B 33.6 mm, and length 14.2 mm.
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$ 14.72
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1-2 weeks delivery time This Allpa 500358 impeller for outboard engines has six blades designed for precise water movement and durability, with Ø A 10.94 mm, Ø B 38.4 mm, and length 17.8 mm.
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$ 18.90
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1-2 weeks delivery time The Allpa 500314 is a six-blade outboard impeller delivering reliable performance in a compact size, measuring Ø A 11 mm, Ø B 32 mm, and length 14.35 mm.
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$ 13.16
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1-2 weeks delivery time Featuring a unique three-blade design, the Allpa 500332 outboard impeller is optimized for smooth operation and efficiency, with Ø A 11.12 mm, Ø B 39 mm, and length 17.7 mm.
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$ 18.55
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1-2 weeks delivery time The Allpa 500309 is a six-blade outboard impeller designed for consistent performance with balanced dimensions of Ø A 11.6 mm, Ø B 32 mm, and length 14.4 mm.
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$ 17.16
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1-2 weeks delivery time This Allpa 500310 impeller features six blades and offers reliable water flow control in a compact form, measuring Ø A 11.6 mm, Ø B 32 mm, and length 14.4 mm.
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$ 12.87
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1-2 weeks delivery time The Allpa 500344 outboard impeller includes six blades and is designed for efficient performance with a slightly larger size, with Ø A 12 mm, Ø B 40 mm, and length 18 mm.
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$ 20.88
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1-2 weeks delivery time Designed for outboard motors, the Allpa 500355 impeller has six blades to optimize performance and water flow, measuring Ø A 12.75 mm, Ø B 38.4 mm, and length 17.8 mm.
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$ 14.46
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1-2 weeks delivery time The Allpa 500318 impeller features six blades with precise dimensions to ensure efficient water circulation, measuring Ø A 13 mm, Ø B 58.8 mm, and length 11.7 mm.
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$ 24.08
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1-2 weeks delivery time This Allpa 500311 outboard impeller includes a gasket and six blades, engineered with precise measurements for optimal operation, with Ø A 15.95 mm, Ø B 51.2 mm, and length 19.05 mm.
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$ 19.37
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How does a flexible impeller differ from a standard water pump impeller in terms of functionality?
A flexible impeller differs from a standard water pump impeller in its design and ability to handle varying conditions. Made of neoprene or nitrile rubber, the flexible impeller blades bend and conform to changes inside the pump body, making it effective for raw water pumping in marine engines. This flexibility allows it to handle small debris and tolerate running dry briefly, reducing the risk of damage compared to a standard impeller, which is typically made of more rigid materials and has less tolerance for friction or sudden changes in conditions.
When replacing a flexible impeller, having the right spare parts is crucial to ensure proper installation and function. An impeller puller is often needed to remove the old impeller from the pump shaft without causing damage. During installation, it's important to lubricate the impeller and insert it in the correct direction to avoid damaging the blades. A proper gasket and cover must also be used to prevent leaks, and all components—such as the impeller hub—should be securely in place to maintain efficient engine cooling.
How does an impeller replacement affect the performance of a boat outboard engine?
Replacing an impeller in a boat outboard engine ensures the engine cooling system functions effectively, preventing overheating and maintaining optimal performance. Installing a new impeller helps maintain efficient water transfer within the pump body, ensuring the engine remains cool during operation. Regular replacement is crucial for reliability, especially for demanding conditions in both inboard and outboard applications.
For reliable replacements tailored to your engine, explore our full selection of Evinrude Impeller options.
What are the differences between neoprene and nitrile impellers for marine applications?
Neoprene and nitrile impellers differ in their suitability for marine applications. Neoprene impellers are ideal for most marine cooling systems due to their flexibility and durability when pumping fresh or saltwater, making them suitable for emergency situations. Nitrile impellers, on the other hand, are more resistant to oils and chemicals, making them a good idea for applications where the impeller may come into contact with fuel or oil. Both types are durable, but choosing the right one depends on the specific needs of the engine's cooling or raw water system.