Marine Engine Preventive Maintenance: Upgrading Your Raw Water Cooling Pump

January 14, 2026

When dependable engine cooling is critical, choosing the right raw water pump can make all the difference. Designed specifically for small marine engines, the JPR-KL25UP JMP Marine Small Engine Cooling Raw Water Pump with Pulley delivers durability, precision engineering, and long-term performance in demanding marine environments.

Built to meet the needs of professional mechanics and boat owners alike, the JPR-KL25UP combines robust construction with service-friendly design—ensuring consistent cooling performance and reduced downtime on the water.

Engineered for Reliable Cooling Performance

At the heart of the JPR-KL25UP is a strong bronze pump body, offering excellent corrosion resistance and structural integrity in saltwater and freshwater applications. This rugged construction ensures the pump can withstand continuous operation while maintaining efficient water flow for engine cooling.

The pump features a marine-grade, non-magnetic shaft with a tapered, threaded end, paired with a long-life mechanical seal to reduce wear and extend service intervals. Designed to work with the JMP flexible impeller 7400-01K, the pump provides smooth, efficient water transfer while protecting internal components from unnecessary stress.

With a compact design and an approximate weight of 2.05 kg (4.50 lbs), the JPR-KL25UP is well-suited for tight engine compartments commonly found in small marine engines.

Compatibility and Application Confidence

The JPR-KL25UP is designed as a replacement for pump part numbers ED0065845590 and AN 7416, and is compatible with engine models 28–40 EFKOZD and 45–65 EFOZDJ. While the pump’s internal components are not internally interchangeable with genuine OEM parts, JMP Marine has implemented internal design improvements to enhance overall quality and performance.

Importantly, the JMP Marine flexible impeller 7400-01K remains fully compatible with OEM specifications, ensuring confidence when sourcing replacement impellers.

Designed for Easy Service and Long-Term Use

Serviceability is a key advantage of the JPR-KL25UP. The pump utilizes O-ring seals at the impeller cover, providing reliable sealing and faster maintenance compared to traditional gasket designs. Spare parts are easy to replace, helping minimize downtime during routine servicing.

For maintenance flexibility, JMP Marine offers:

• Major Service Kit (JSK0212) – all internal parts (sold separately)

• Minor Service Kit (JSM0212) – for routine servicing (sold separately)

Each pump features laser-etched identification on the stainless steel end cover plate, including the pump part number, impeller number, and batch number—making identification and maintenance tracking simple and precise.

Key Features at a Glance

• Strong bronze body for corrosion resistance

• Marine-grade, non-magnetic shaft

• Stainless steel end cover plate

• Long-life mechanical seal

• High-performance flexible impeller (JMP 7400-01K)

• Easy replacement of spare parts

• O-ring sealed impeller cover

• Laser-etched identification for traceability

Dependable Cooling Backed by JMP Marine Quality

Whether you’re replacing a worn pump or upgrading for improved reliability, the JPR-KL25UP offers a trusted solution for small engine cooling systems. Designed with performance, durability, and ease of maintenance in mind, it reflects JMP Marine’s commitment to quality engineering and marine reliability.

JMP MARINE… “THE ONLY ONE.”