Parts for Caterpillar 3406E – Engine Water Pump Section

The Caterpillar 3406E engine has long been considered one of the most dependable heavy-duty diesel engines ever produced. A key part of its reliability lies in its cooling system, which keeps the engine running at safe operating temperatures even in high-demand conditions. At the center of this system is the engine water pump, supported by components such as thermostats, seals, adapter plates, coolant hoses, and clamps. This catalog section provides a complete guide to every water pump–related part for the Caterpillar 3406E, offering heavy-duty Diesel Pro aftermarket replacements trusted by over 40,000 satisfied customers worldwide.

Engine Water Pumps for Caterpillar 3406E

Standard Engine Water Pump

The standard water pump for the Caterpillar 3406E is built to deliver consistent coolant flow under all conditions, whether the engine is powering long-haul trucks, industrial equipment, or marine applications. The pump circulates coolant from the radiator through the engine block and cylinder heads, ensuring even distribution of temperature.

This pump is precision-engineered for the 3406E and is available as a complete assembly, ready to bolt on with no modifications required.

Multi-Application Water Pump

Another water pump option fits across multiple Caterpillar heavy-duty engines, including the 3406E. While compatible with other models, this design has been specifically optimized for the flow rates required by the 3406E, ensuring it meets or exceeds Caterpillar’s performance standards.

By installing this pump, operators can achieve improved efficiency, reduced overheating risk, and longer service intervals.

Heavy-Duty Water Pump for Extended Applications

For 3406E engines operating in harsher conditions—such as high-horsepower trucks, construction machinery, or marine power units—a heavy-duty water pump variant is available. This version is designed for increased durability with reinforced housing, robust impeller design, and higher thermal tolerance.

Fresh Water Pump for Caterpillar 3406E

The fresh water pump is essential in marine and certain industrial configurations of the 3406E. This pump ensures the closed-loop cooling system is maintained with precision, keeping saltwater separate from internal engine components while still providing the necessary heat exchange. Diesel Pro aftermarket pumps are engineered to prevent premature wear and withstand continuous heavy-duty cycles.

Water Pump Support Components

Water Pump Repair Kit

Instead of replacing the entire pump, operators can choose a repair kit specifically designed for the Caterpillar 3406E. This kit includes seals, bearings, and other essential wear parts. It is a cost-effective way to restore pump performance and extend service life, especially for fleets or industrial users looking to reduce downtime and costs.

Repair kits are ideal when the pump housing and major components remain intact but internal wear has reduced efficiency.

Water Pump Adapter Plate

The adapter plate connects the water pump to the engine block, ensuring a secure and leak-free installation. For the 3406E, the adapter plate is designed with exact alignment tolerances to maintain the integrity of the cooling system.

Replacing a worn or corroded adapter plate is critical, as even minor warping or gasket failure at this connection point can lead to coolant leaks and overheating.

Thermostats & Seals for Caterpillar 3406E

Thermostat (180°F Regulator)

The thermostat for the Caterpillar 3406E regulates coolant flow based on engine temperature, opening at 180°F. This ensures the engine reaches optimal operating temperature quickly and maintains it for efficiency, fuel economy, and reduced wear.

A faulty thermostat can result in overheating, poor fuel performance, or extended warm-up times, making replacement an essential maintenance task.

Thermostat Seal

The thermostat seal provides a tight, leak-proof fit between the thermostat and housing. Diesel Pro aftermarket seals are manufactured from heat-resistant materials that maintain elasticity and durability under repeated thermal cycles.

Thermostat Gasket

The gasket is another critical component for ensuring coolant does not leak around the thermostat housing. Designed specifically for the 3406E, this gasket maintains tight tolerances and is made from high-quality materials that resist degradation from constant coolant exposure.

Silicone Coolant Hoses for Caterpillar 3406E

Heavy-Duty Silicone Hoses

The coolant hoses for the Caterpillar 3406E are available in a wide variety of inner diameters, ensuring proper fit for every coolant line in the engine’s water circulation system. These hoses are manufactured from reinforced silicone, offering several advantages over standard rubber hoses:

• Higher resistance to extreme heat and pressure

• Greater flexibility and crack resistance

• Extended service life in high-demand applications

Available Hose Sizes

For the Caterpillar 3406E, silicone hoses are available in sizes ranging from 3/4 inch to 4 inches in inside diameter. Each hose is supplied in 1-foot lengths, allowing flexibility in custom installations and replacements.

Sizes include:

• 3/4 inch

• 1 inch

• 1 3/4 inch

• 1 7/8 inch

• 2 inch

• 2 1/8 inch

• 2 1/4 inch

• 2 1/2 inch

• 2 3/8 inch

• 2 3/4 inch

• 3 inch

• 3 1/2 inch

• 4 inch

Each hose is built to withstand high coolant pressures and is reinforced for long-lasting durability.

Hose Clamps for Caterpillar 3406E Cooling System

Importance of Proper Hose Clamps

Hose clamps are critical to maintaining coolant system integrity. Without properly secured hoses, leaks can develop that lead to overheating, reduced coolant pressure, and even catastrophic engine failure.

Range of Clamp Sizes

For the 3406E, Diesel Pro provides a full range of clamps covering effective diameter ranges from as small as 9/16 inch up to 3.5 inches. This ensures a perfect fit for every coolant line and hose size in the system.

Clamp designs feature:

• Corrosion-resistant construction

• Adjustable tightening range

• Heavy-duty bands to prevent slipping under pressure

Clamp Applications

Each clamp is designed to hold coolant hoses securely under varying thermal and pressure conditions. Whether securing small bypass hoses or larger main coolant lines, Diesel Pro clamps deliver the reliability required for heavy-duty performance.

Why Choose Diesel Pro Power for Caterpillar 3406E Water Pump Parts

• Global Trust: Trusted by over 40,000 satisfied customers across 180+ countries.

• Fast Worldwide Shipping: All orders ship within 24 hours with full tracking.

• Engine-Specific Catalogs: Every pump, kit, seal, hose, and clamp listed here is designed for the Caterpillar 3406E—no guesswork.

• Heavy-Duty Durability: Diesel Pro aftermarket components are engineered to withstand the toughest conditions in trucking, industrial, and marine environments.

• Expert Support: Decades of Caterpillar experience mean you can count on guidance for installation, maintenance, and troubleshooting.