Caterpillar C1.5 Marine Water Pump & Cooling System Parts Catalog

The Caterpillar C1.5 is one of the smallest and most efficient marine engines offered by Caterpillar, commonly used in auxiliary power units, small craft propulsion, and onboard generator sets. Even with its compact size, the C1.5 engine relies on a reliable marine raw water cooling system to maintain proper operating temperatures. Without a properly functioning seawater pump, impellers, zinc anodes, and supporting hoses, the engine risks overheating, premature wear, and shortened service life.

This catalog covers the Caterpillar C1.5 raw water pump along with all related cooling system components—zinc anodes, coolant hoses, clamps, and installation tools. Each part listed here is designed to meet or exceed Caterpillar specifications, ensuring dependable operation for small vessel operators and commercial fleets alike.

Marine Raw Water Pump for Caterpillar C1.5 & C2.2 Engines

At the heart of the cooling system is the Caterpillar C1.5 seawater pump. This pump draws seawater from the surrounding environment and circulates it through the heat exchanger, carrying away heat produced by combustion.

• Mechanical Seal Protection – Prevents leaks and ensures long pump life.

• Compact Design – Engineered to fit the smaller frame of the C1.5 while still moving sufficient water volume.

• Durable Materials – Resistant to saltwater corrosion, a key factor in marine engine reliability.

Replacing the seawater pump at regular service intervals is crucial to avoid overheating issues that can damage pistons, liners, and cylinder heads.

Impeller Puller for Caterpillar Marine Pumps

When servicing the seawater pump, the impeller often needs to be replaced. Over time, impeller blades wear, harden, or crack, reducing pump efficiency.

• Specialized Puller Tool – Designed to extract the impeller safely without damaging the housing.

• Saves Time – Makes impeller maintenance easier, even in tight engine compartments.

• Protects Components – Avoids accidental scratches or scoring of the pump interior.

This tool is a must-have for operators who perform their own preventive maintenance.

Zinc Anodes for Caterpillar C1.5 Marine Engines

Saltwater environments are harsh, and galvanic corrosion is a constant threat. To protect critical cooling system parts, zinc anodes are installed in the raw water circuit. These sacrificial components corrode first, preserving pumps, coolers, and housings.

Available in multiple thread sizes and dimensions, the zincs for the C1.5 ensure compatibility with different cooling circuit points:

• Small NPT Sizes (1/4” and 3/8”) – For compact fittings and cooler passages.

• Larger NPT Sizes (1/2” to 1 1/4”) – For larger housings and key protection zones.

• Premium Marine Grade Zinc – Formulated specifically to protect against seawater corrosion.

Routine inspection and replacement of zincs is one of the simplest yet most important maintenance steps for any Caterpillar marine engine.

Silicone Coolant Hoses for Caterpillar C1.5 Cooling Systems

In addition to seawater cooling, the C1.5 engine incorporates closed-loop coolant that requires flexible, heat-resistant hoses. Silicone hoses offer superior durability compared to standard rubber.

• Heat Resistance – Maintains integrity under high operating temperatures.

• Flexible Design – Allows installation in tight spaces without collapsing.

• Multiple Diameters – Ranging from 1” to 4” inside diameter to cover the entire C1.5 system.

• Sold by the Foot – Operators can cut to length for exact fitment.

Replacing coolant hoses before they crack or leak prevents coolant loss and overheating—common risks in aging marine engines.

Hose Clamps for Marine Cooling Applications

Every hose connection in a Caterpillar C1.5 cooling system depends on strong, reliable clamps.

• Wide Range of Diameters – Covers everything from small fuel lines to large 4” coolant hoses.

• Stainless Steel Construction – Corrosion-resistant, vital for marine environments.

• Secure Seal – Prevents leaks that can lead to loss of cooling efficiency.

Routine replacement of clamps ensures that hoses remain secure even under vibration and varying engine loads.

Additional Marine System Support Parts

Diesel Pro Power also supports Caterpillar C1.5 operators with additional marine-grade components designed to keep the engine room in top shape:

• Mechanical & Electrical Gauges – For monitoring water temperature, oil pressure, and system performance.

• Marine Control Cables – Including 33C and 43C series for throttle and shift control.

• Marine Steering & Bearings – Precision parts for smooth and reliable helm response.

• Navigation Lights & Electrical Components – Ensuring compliance with maritime regulations and safe operation.

Why Choose Diesel Pro Power for Caterpillar C1.5 Cooling Parts

When it comes to sourcing Caterpillar C1.5 raw water pumps and marine cooling parts, operators worldwide trust Diesel Pro Power.

• Trusted by 40,000+ Customers in Over 180 Countries – From small fishing boats to commercial fleets, our customers count on us for dependable parts.

• Premium Aftermarket Quality – Every pump, hose, anode, and clamp is engineered to meet Caterpillar standards for performance and durability.

• Fast Worldwide Shipping – Minimize downtime with quick delivery, no matter where your vessel operates.

• Dedicated Caterpillar C1.5 Catalog – Organized by system and component for easy navigation and ordering.

• Expert Technical Support – Our specialists help you select the right pump, zinc, or hose size for your exact marine setup.