Caterpillar C15 Freshwater Pump & Cooling System Parts Catalog

The Caterpillar C15 engine is one of the most trusted diesel engines in heavy-duty trucks, marine vessels, and industrial equipment. Known for its power, torque, and durability, the C15 also relies on a precision-engineered cooling system to maintain optimal performance under demanding conditions. At the heart of this system is the freshwater pump (engine water pump)—a critical component that circulates coolant through the engine block, cylinder heads, and radiator, preventing overheating and ensuring long-term reliability.

This catalog provides a complete breakdown of water pumps, coolant hoses, clamps, and gauges for the Caterpillar C15 engine, giving you access to high-quality replacement parts that match OEM standards. Whether you’re performing routine maintenance, a full engine rebuild, or responding to a cooling system failure, Diesel Pro Power offers the parts you need with fast worldwide shipping and 40,000+ satisfied customers worldwide.

Engine Water Pumps for Caterpillar C15

Primary Water Pump Options for the C15

The Caterpillar C15 shares compatibility with certain 3406 and C18 configurations, making it important to select the right pump for your application. We provide two main engine water pump options specifically designed to meet the needs of C15 operators:

1. Engine Water Pump for Caterpillar 3406B, 3406E, and C15
   This water pump is engineered to deliver OEM-level performance, ensuring consistent coolant circulation even in high-temperature and heavy-load conditions. It is commonly used in highway trucks, mining equipment, and construction machinery powered by the C15.

2. Engine Water Pump for Caterpillar 3406E, C15, and C18
   A robust alternative suitable for later-generation C15 engines as well as certain C18 configurations. Designed for maximum durability, it reduces the risk of overheating during extended operation and is built to withstand demanding industrial and marine environments.

Both pumps feature cast housings, precision bearings, and heavy-duty impellers designed to withstand extreme operating conditions. By maintaining proper coolant flow, these pumps extend the life of critical engine components such as cylinder heads, gaskets, and liners.

Coolant Hoses for Caterpillar C15

The C15 cooling system relies on a network of silicone coolant hoses that connect the water pump, radiator, and other cooling components. Over time, hoses can become brittle or crack due to heat cycles, pressure fluctuations, and chemical exposure. Replacing them with silicone hoses ensures greater flexibility, durability, and resistance to wear.

Available hose sizes for the Caterpillar C15 include:

• 1” Inside Diameter – commonly used for bypass and smaller coolant circulation lines.

• 3/4” Inside Diameter – ideal for tighter bends and auxiliary connections.

• 1 3/4”, 1 7/8”, 2”, 2 1/8”, 2 1/4” Inside Diameter – mid-range hoses that handle primary coolant flow between major engine components.

• 2 1/2”, 2 3/4”, 2 3/8” Inside Diameter – larger hoses for higher volume coolant circulation.

• 3” and 3 1/2” Inside Diameter – robust hoses designed for heavy-duty radiator connections.

• 4” Inside Diameter – maximum flow hoses that handle large cooling demands in industrial or marine C15 applications.

Each hose is 1 foot long and can be cut or extended to match installation requirements. Silicone hoses outperform traditional rubber hoses by providing superior resistance to high temperatures, extreme pressures, and long-term coolant exposure.

Hose Clamps for Caterpillar C15 Cooling System

To secure hoses under constant vibration and pressure, heavy-duty hose clamps are essential. Diesel Pro Power provides a complete range of clamps for Caterpillar C15 cooling systems.

Available options include:

• Clamp for Coolant & Fuel Hose (Range: 9/16” – 1-1/16”) – best for smaller diameter coolant and fuel lines.

• Clamp for Coolant Hose (Range: 11/16” – 1-1/4”) – durable, medium-size clamp for general coolant applications.

• Clamp for Coolant Hose (Range: 13/16” – 1-3/4”) – extra security for mid-sized hose connections.

• Clamp for Coolant & Fuel Hose (Range: 1” – 1.5”) – versatile clamp for multi-purpose cooling and fuel systems.

• Clamp for Coolant Hose (Range: 1-5/16” – 2-1/4”) – designed for larger hoses in main coolant circulation.

• Clamp for Coolant Hose (Range: 1-9/16” – 2-1/2”) – heavy-duty option for vibration-prone environments.

• Clamp for Coolant Hose (Range: 2-5/16” – 3”) – large clamp suitable for radiator and water pump inlet/outlet hoses.

Each clamp is made from corrosion-resistant steel, ensuring long service life even in harsh environments such as mining, trucking, or marine operations.

Mechanical & Electric Gauges for the C15 Cooling System

Monitoring the health of your Caterpillar C15 cooling system is just as important as installing quality water pumps and hoses. Diesel Pro Power offers a complete line of mechanical and electric gauges to keep you informed about coolant pressure, temperature, and system performance.

• Mechanical Gauges (Standard or with Alarm) – provide direct readings with no reliance on external power. Ideal for rugged applications where reliability is paramount.

• Electrical Gauges (12V and 24V options) – perfect for modern trucks, equipment, and marine vessels that use onboard electrical systems. These gauges can be paired with alarms for added protection against overheating.

Accurate gauges help operators detect cooling system failures early, reducing the risk of catastrophic engine damage and costly downtime.

Applications of the Caterpillar C15 Cooling System

The C15 cooling system is vital in a wide range of applications, including:

• Highway Trucks – Freightliner, Peterbilt, and Kenworth trucks powered by C15 engines rely on water pumps and hoses to handle long hauls and steep grade climbs.

• Heavy Equipment – Bulldozers, loaders, and excavators require reliable cooling to sustain high horsepower under extreme loads.

• Marine Engines – The C15 is used in commercial fishing vessels, tugboats, and ferries, where raw water and freshwater pumps combine to keep the engine within safe temperature ranges.

• Industrial Power Units – Generators and compressors powered by the C15 depend on efficient cooling for continuous operation.

Why Buy Caterpillar C15 Cooling System Parts from Diesel Pro Power?

When it comes to critical components like water pumps, hoses, clamps, and gauges, choosing the right supplier makes all the difference. Here’s why operators around the world choose Diesel Pro Power:

• 40,000+ Satisfied Customers – Trusted globally for reliable parts and outstanding service.

• OEM-Quality Guarantee – Every part is designed to meet or exceed Caterpillar’s performance standards.

• Fast Worldwide Shipping – Keep your fleet or vessel running with minimal downtime.

• Dedicated C15 Catalog – Shop with confidence knowing every item is tailored for your engine.

• Expert Support – Our team helps identify the correct part for your exact application.