Caterpillar C15 Raw Water Pump and Marine Cooling System Parts Catalog

The Caterpillar C15 marine engine is a high-performance diesel engine trusted in commercial vessels, offshore applications, and private yachts. Like all marine engines, its performance depends on a reliable cooling system. At the heart of that system is the raw water pump, which circulates seawater through heat exchangers, oil coolers, and aftercoolers to maintain safe operating temperatures.

At Diesel Pro Power, we provide a complete catalog of aftermarket Caterpillar C15 raw water pumps and related cooling components. Our inventory is engineered for heavy-duty service, designed to reduce downtime, and backed by 40,000+ satisfied customers worldwide.

Marine Water Pump for Caterpillar C15 Engines

The raw water pump is the centerpiece of the C15 cooling system. It ensures continuous circulation of seawater through the engine, preventing overheating even under heavy loads. Diesel Pro Power offers aftermarket pumps built with marine-grade bronze, stainless hardware, and high-performance seals to resist corrosion in saltwater environments.

Key Features

• Heavy-duty bronze housing for long life.

• Designed for high-volume seawater flow.

• Precision-fit flange ports for secure installation.

• Reliable shaft seals to prevent leaks.

• Built to match Caterpillar C15 marine cooling system requirements.

Mounting Gaskets and Seals

Proper sealing ensures the raw water pump maintains pressure and prevents leaks. Diesel Pro Power supplies mounting gaskets and O-rings made from high-temperature, marine-grade materials.

• Pump Mounting Gasket – Creates a tight seal between the pump and engine block.

• O-Ring Seals – Installed on pump housings and covers to prevent seawater leakage.

• Heavy-duty clamps – Keep hoses and fittings secure under pressure.

By replacing gaskets and seals during pump service intervals, operators ensure leak-free performance and protect surrounding components from corrosion.

Marine Pump Impellers for Caterpillar C15

The impeller is the heart of the raw water pump. It spins inside the housing, drawing seawater in and pushing it through the cooling circuit. Over time, impeller blades wear, harden, or break, reducing cooling efficiency.

Our aftermarket C15 impellers are built from premium marine-grade elastomers designed to resist saltwater, sand, and debris.

Benefits of Diesel Pro Power Impellers:

• Strong flexible blades for maximum water flow.

• Resistant to cracking and swelling in marine environments.

• Easy to install using our optional impeller puller tool.

• Reliable performance for long service intervals.

Routine inspection and replacement of impellers every 12–18 months helps prevent overheating and extends engine life.

Impeller Puller Tool

Removing worn impellers can be difficult without the right equipment. Diesel Pro Power supplies a specialized impeller puller designed for Caterpillar C15 marine pumps.

• Prevents damage to pump housings.

• Makes impeller replacement faster and safer.

• Built for repeated professional use.

For vessel operators and marine service yards, the impeller puller saves time and reduces the risk of costly pump damage.

Zinc Anodes for Corrosion Protection

Saltwater cooling circuits are vulnerable to galvanic corrosion. To protect pumps, housings, and heat exchangers, zinc anodes are installed inside the cooling system.

Diesel Pro Power offers a full range of threaded zinc anodes for Caterpillar C15 marine engines.

Features:

• Multiple NPT thread sizes for different housings.

• Easy to install and replace during routine service.

• Protects pump bodies, coolers, and exchangers from electrolysis.

• Extends the service life of the entire cooling system.

Zincs should be inspected every few months and replaced as soon as they show 50% wear.

Silicone Coolant Hoses

While the raw water pump handles seawater, the closed-loop coolant circuit depends on high-temperature hoses. Diesel Pro Power provides marine-grade silicone hoses for Caterpillar C15 cooling systems.

• Available in multiple diameters from 1” to 4”.

• High flexibility for tight engine spaces.

• Resistant to heat, pressure, and chemical degradation.

• Reinforced construction for long life.

Silicone hoses are superior to standard rubber, offering longer service intervals and reduced risk of failure under heavy marine workloads.

Hose Clamps for Marine Cooling Systems

A cooling system is only as strong as its weakest connection. Diesel Pro Power supplies marine-grade stainless steel clamps that secure coolant and raw water hoses against leaks.

• Corrosion-resistant stainless construction.

• Wide range of sizes for different hose diameters.

• Smooth inner bands prevent hose damage.

• Designed to maintain pressure under vibration and load.

Replacing clamps at the same time as hoses ensures long-lasting, leak-free operation.

Why Buy Caterpillar C15 Raw Water Pumps from Diesel Pro Power?

When it comes to marine engines, downtime is expensive. That’s why operators around the globe trust Diesel Pro Power for Caterpillar C15 cooling system parts:

• 40,000+ Satisfied Customers Worldwide – Commercial fleets, offshore operators, and private yachts rely on us.

• Global Shipping to Over 180 Countries – Fast, trackable delivery reduces downtime.

• Complete Marine Cooling Catalog – Pumps, impellers, zincs, hoses, clamps, and gaskets all in one place.

• Exclusive Marine & Industrial Focus – No distractions from automotive parts—only heavy-duty diesel engines like the C15.

• Expert Technical Support – Assistance with impeller sizing, zinc replacement schedules, and pump troubleshooting.

By sourcing your Caterpillar C15 raw water pump and cooling system components from Diesel Pro Power, you gain more than just parts—you gain a trusted aftermarket partner dedicated to keeping your vessel running strong.