Caterpillar 3406 Raw Water Pump & Cooling System Components

The Caterpillar 3406 is one of the most trusted engines in the marine industry, known for its durability and ability to power commercial vessels, fishing fleets, and offshore support boats under extreme conditions. A crucial part of its operation is the raw water pump and supporting cooling components, which ensure that the engine maintains safe operating temperatures even during heavy loads and continuous duty.

This catalog provides a detailed breakdown of raw water pumps, impellers, zinc anodes, and silicone coolant hoses specifically designed for Caterpillar 3406 marine engines. By keeping all of these essential cooling system parts in one place, operators can streamline maintenance and avoid costly downtime.

Marine Raw Water Pump for Caterpillar 3406

The raw water pump is the heart of the Caterpillar 3406 cooling system. It draws seawater into the engine’s heat exchanger, where it absorbs excess heat before being discharged back into the ocean.

• Durable Marine-Grade Design – Built to withstand saltwater corrosion and extended use.

• 2” Flange Port Connections – Designed for standard marine cooling setups.

• Rebuilt and Ready for Service – Pumps are remanufactured to factory specifications for maximum reliability.

By choosing a high-quality raw water pump for the Caterpillar 3406, operators ensure stable cooling under heavy load conditions and long service life for their engine.

Impeller Puller for Marine Water Pumps

Routine service of a Caterpillar 3406 raw water pump requires impeller removal. The impeller puller tool makes this job significantly easier and prevents accidental damage to the impeller housing.

• Designed for Tight Spaces – Simplifies pump servicing in marine engine rooms.

• Protects Components – Removes impellers without bending or scoring pump housings.

• Universal Application – Works with Caterpillar and Detroit Diesel raw water pumps.

Keeping an impeller puller on hand reduces service times and helps ensure proper maintenance intervals for the cooling system.

Impellers for Caterpillar 3406 Marine Water Pumps

The impeller is the rotating component that drives seawater through the cooling system. Replacing impellers at regular intervals is critical for avoiding overheating and pump failure.

• 12-Blade Bronze Impeller – Built for marine durability and saltwater resistance.

• Double Flat Drive Connection – Provides reliable torque transfer and prevents slippage.

• Dimensions – Approximately 3 3/4” diameter and 3 1/2” height.

Worn impellers are one of the most common causes of cooling system failure. Keeping spare impellers on board ensures quick replacement in the event of wear, cracking, or blade loss.

Zinc Anodes for Caterpillar 3406 Cooling Systems

Zinc anodes are sacrificial components designed to prevent corrosion inside the raw water cooling circuit. By sacrificing themselves, they protect the pump housing, heat exchanger, and other metal surfaces from saltwater damage.

Key Zinc Anode Options for Caterpillar 3406:

• Small Threaded Zincs (1/4” NPT) – Ideal for protecting smaller coolant passages.

• Medium Zincs (3/8” – 1/2” NPT) – Commonly installed in raw water pumps and heat exchangers.

• Large Zincs (3/4” – 1 1/4” NPT) – Provide extended corrosion protection in high-volume cooling systems.

Benefits of Routine Zinc Replacement:

• Prevents internal rust and corrosion.

• Extends the lifespan of the raw water pump and heat exchanger.

• Protects against costly repairs caused by pitting or saltwater scaling.

Operators should inspect and replace zinc anodes every 90 days or during scheduled maintenance intervals to ensure continuous protection.

Silicone Coolant Hoses for Caterpillar 3406

Beyond raw water pumps and zincs, the Caterpillar 3406 relies on a network of coolant hoses to circulate water throughout the engine. Using premium silicone hoses ensures longer service life and resistance to marine operating conditions.

Available Hose Sizes:

• 1” Inside Diameter – Common for smaller coolant lines.

• 1 3/4” Inside Diameter – Supports medium-volume coolant passages.

• 1 7/8” Inside Diameter – Designed for larger flow systems.

• 2” Inside Diameter – Ideal for main water circulation routes.

Advantages of Silicone Hoses:

• Resistant to heat, pressure, and saltwater exposure.

• More durable than traditional rubber hoses.

• Flexible construction allows easy installation in tight engine compartments.

Replacing worn hoses before they fail is a simple yet critical part of preventive maintenance for the Caterpillar 3406 cooling system.

Why Choose Diesel Pro Power for Caterpillar 3406 Cooling Parts

Diesel Pro Power is the trusted global supplier of Caterpillar 3406 marine cooling components, serving vessel operators who require uncompromising reliability and technical expertise. With over 40,000 satisfied customers worldwide, our reputation has been built on supplying quality parts and providing responsive support to both large commercial fleets and independent operators.

• Trusted by Global Operators – From tugboats and fishing fleets to offshore support vessels and cargo ships, Diesel Pro Power has become the go-to source for Caterpillar 3406 cooling parts that keep engines running under extreme marine conditions.

• Shipping to Over 180 Countries – Our fast, trackable delivery network ensures operators receive their parts on time, reducing costly downtime and keeping vessels on schedule anywhere in the world.

• Complete Catalog in One Place – Whether you need a raw water pump, replacement impellers, zinc anodes, gaskets, clamps, or silicone coolant hoses, our catalog consolidates everything required for Caterpillar 3406 cooling system maintenance into a single, easy-to-navigate source.

• Exclusive Marine Focus – Unlike general suppliers who divide attention across multiple markets, Diesel Pro Power is fully dedicated to heavy-duty diesel engines in marine and industrial applications. Every Caterpillar 3406 part we offer is chosen with the needs of professional marine operators in mind.

• Expert Technical Support – Our team provides detailed guidance on impeller sizing, gasket compatibility, pump rebuilds, zinc replacement intervals, and other critical aspects of cooling system maintenance, ensuring operators install the right parts the first time.

By sourcing Caterpillar 3406 cooling components from Diesel Pro Power, operators gain more than just replacement parts—they gain the assurance that every product is engineered for precision, durability, and long-term performance in demanding marine environments. The result is maximum uptime, reduced risk of overheating, and extended service life for one of Caterpillar’s most trusted engines.