Parts for Caterpillar C18 – Marine Water Pump Section

The Caterpillar C18 marine engine is a high-performance workhorse relied on in yachts, ferries, tugboats, offshore vessels, and heavy-duty commercial fleets. Its cooling system is essential to engine reliability, and at the heart of that system is the raw water pump. This pump circulates seawater through heat exchangers, aftercoolers, and oil coolers to maintain safe operating temperatures. Without a properly functioning pump, the C18 can quickly overheat, leading to downtime and costly repairs.

At Diesel Pro Power, we provide a full range of aftermarket marine raw water pumps and cooling system components designed specifically for the Caterpillar C18. Trusted by over 40,000 customers worldwide, we specialize in keeping vessels running reliably, with shipping available to more than 180 countries.

Marine Water Pump for Caterpillar C18 Engines

Our aftermarket marine water pump for the Caterpillar C18 is engineered for durability and efficiency. It is designed to handle the harshest marine conditions, including continuous seawater exposure, vibration, and heavy-duty operation.

• Built for the Caterpillar C18 marine cooling system configuration.

• Heavy-duty bronze housing for corrosion resistance.

• Port flange size engineered for precise fitment and efficient water flow.

• Designed to provide reliable circulation in both high-load and continuous-duty applications.

This pump ensures that your C18 maintains stable operating temperatures, preventing overheating and extending the life of your engine.

Mounting Gaskets and Seals

To ensure a leak-free installation, the water pump requires mounting gaskets and O-rings. These components prevent seawater leaks, which can damage nearby engine parts.

• Pump Mounting Gasket – Provides a secure seal between the pump and engine.

• O-Ring Seals – Two seals are required per pump, ensuring watertight performance.

• Pump Clamp – A precision-fit clamp keeps the pump securely fastened under vibration and load.

Replacing these seals and gaskets during pump service is critical for long-term reliability.

Impellers for Caterpillar C18 Water Pumps

The impeller is the most frequently serviced part of any raw water pump. Over time, blades can wear, crack, or break due to debris, heat, or saltwater corrosion.

• Designed for the Caterpillar C18 pump’s 12-blade, spline-drive configuration.

• Built from marine-grade elastomer to maximize flexibility and durability.

• Provides optimal water flow and cooling efficiency.

• Easy to install with standard service tools.

Regular impeller inspection and replacement is one of the simplest ways to prevent unexpected engine overheating.

Impeller Puller Tool

Removing an impeller by hand can damage the pump housing or the impeller itself. Our impeller puller tool makes the job quick and efficient.

• Designed for use with Caterpillar, Cummins, Detroit Diesel, and other marine water pumps.

• Allows safe removal of impellers without scoring the bronze pump housing.

• A must-have tool for marine mechanics and operators who perform regular maintenance.

Zinc Anodes for Caterpillar C18 Cooling Systems

Zinc anodes protect your C18’s raw water pump and heat exchanger from galvanic corrosion. As seawater flows through the cooling system, dissimilar metals can corrode. Zinc sacrificial anodes absorb that corrosion, protecting more expensive components.

We stock a full range of zinc anodes compatible with Caterpillar C18 engines, available in multiple diameters and thread sizes:

• 1/4” NPT zincs – Small, compact, used in pump housings and small exchangers.

• 3/8” and 1/2” NPT zincs – Standard replacements for heat exchangers.

• 3/4” and 1 1/4” NPT zincs – Heavy-duty protection for larger cooling circuits.

Replacing zincs on schedule is essential to protect pumps, coolers, and housings from expensive saltwater corrosion.

Silicone Coolant Hoses

While the raw water pump handles seawater, the Caterpillar C18 also uses a closed-loop freshwater coolant circuit. We supply marine-grade silicone coolant hoses designed to withstand high heat, pressure, and vibration.

• Available in multiple inside diameters.

• Resistant to cracking, swelling, and chemical breakdown.

• Flexible yet strong, ideal for tight engine room installations.

• Each hose is reinforced for long service life.

Replacing aging hoses helps prevent leaks that can reduce cooling efficiency or cause catastrophic engine overheating.

Why Choose Diesel Pro Power for Caterpillar C18 Marine Cooling Parts

When it comes to keeping your Caterpillar C18 engine operating at peak performance, Diesel Pro Power stands as the trusted aftermarket source worldwide. Our reputation has been built over decades by delivering reliable parts, expert support, and consistent service to vessel operators who can’t afford downtime.

• 40,000+ Satisfied Customers – From commercial shipping fleets and tugboats to offshore platforms and private yachts, operators across the globe rely on Diesel Pro Power to keep their Caterpillar C18 engines performing under pressure.

• Global Shipping to Over 180 Countries – We understand the demands of marine operations. Whether your vessel is docked in Miami, operating in the North Sea, or traveling between ports in Asia, our fast and trackable shipping ensures your cooling system parts arrive quickly and without complications.

• Complete Marine Cooling Catalog – We stock every critical component of the Caterpillar C18 cooling system in one place. That means you can order water pumps, impellers, zincs, gaskets, clamps, and silicone hoses together, saving both time and logistics costs.

• Exclusive Marine & Industrial Focus – Unlike general suppliers who mix in automotive or light-duty parts, Diesel Pro Power is dedicated solely to heavy-duty marine and industrial engines. This specialization ensures our Caterpillar C18 cooling parts are selected for durability in harsh saltwater environments.

• Expert Technical Support – Our experienced team provides guidance on maintenance intervals, impeller replacement schedules, zinc selection, and troubleshooting for pump-related issues. This level of support helps extend the service life of your cooling system while reducing costly mistakes.

• Proven Reliability Under Pressure – Every part in our catalog is designed with the realities of marine operation in mind—constant load, saltwater exposure, and high heat. Operators choose Diesel Pro Power not just for convenience, but because they know our parts keep vessels moving.

By sourcing your Caterpillar C18 water pump and marine cooling system components from Diesel Pro Power, you’re not just buying parts—you’re investing in a long-term partner dedicated to reliability, uptime, and global support.