Caterpillar 3406B Fresh Water Pump Catalog

Engine Specifications & Cooling System Overview

The Caterpillar 3406B engine is a 14.6-liter, inline six-cylinder powerhouse that has long been celebrated for its durability, power delivery, and ease of service. Introduced in the 1980s, the 3406B quickly became the backbone of countless heavy-duty applications around the world. From over-the-road trucks to stationary power generation, this engine was designed to operate in punishing environments where reliability is non-negotiable.

At the center of the 3406B’s performance is its cooling system, which ensures that the engine maintains safe operating temperatures even under extreme loads. The combustion process in a heavy-duty diesel engine creates immense heat, and without a properly functioning cooling system, catastrophic damage could occur.

The fresh water pump is the driving force behind this cooling system. Its job is to circulate coolant through the block, cylinder head, and radiator (or in some cases heat exchangers for marine-adapted variants). A consistent flow of coolant prevents hotspots, stabilizes engine temperature, and keeps components such as cylinder liners, pistons, and valves safe from heat stress.

For operators of Caterpillar 3406B engines, Diesel Pro Power offers a complete line of aftermarket fresh water pump solutions including:

• Fresh water pump (complete assembly).

• Fresh water pump rebuild kit.

• Fresh water pump seal.

Each of these parts is built specifically for the 3406B engine, eliminating guesswork and ensuring reliable cooling performance.

Fresh Water Pump for Caterpillar 3406B Engines

The fresh water pump for the Caterpillar 3406B is a heavy-duty centrifugal pump designed to deliver consistent coolant circulation throughout the engine.

Diesel Pro Aftermarket Construction

Unlike generic suppliers, Diesel Pro Power provides aftermarket pumps designed specifically for the 3406B engine. Each pump is engineered to meet the demands of continuous operation under heavy load conditions.

Key construction features include:

• Cast housing: Built for strength and long service life under thermal stress.

• Balanced impeller: Designed to maintain smooth coolant flow with minimal vibration.

• Durable bearings: Withstand constant belt-driven rotation at high RPM.

• Precise fitment: Ensures straightforward installation on Caterpillar 3406B engines.

Benefits of Replacement

Replacing a worn or leaking fresh water pump with a Diesel Pro aftermarket pump ensures:

• Stable engine operating temperature.

• Reduced risk of overheating under load.

• Extended cylinder head and gasket life.

• Protection of the entire cooling system.

Applications

The 3406B fresh water pump is essential for:

• Long-haul trucks powered by the 3406B.

• Construction and industrial machinery using the 3406B.

• Stationary generators where continuous operation is required.

Fresh Water Pump Rebuild Kit for Caterpillar 3406B Engines

When a complete pump replacement is not necessary, operators can rely on the fresh water pump rebuild kit for the Caterpillar 3406B.

Components Included

Diesel Pro aftermarket rebuild kits typically include:

• Bearings: Restores smooth impeller rotation.

• Seals: Prevents coolant leaks around the shaft and housing.

• Gaskets and O-rings: Provides leak-free assembly.

• Supporting components: Ensures restored OEM-equivalent performance.

Advantages of Using a Rebuild Kit

• Cost-effective solution: Extends the life of an existing pump at lower cost.

• Environmentally responsible: Reduces waste by reusing pump housings.

• Reliable performance: Diesel Pro aftermarket parts restore the pump’s durability.

• Convenient repair: Allows field rebuilds where a complete pump replacement may not be practical.

Technical Considerations

Rebuilding a 3406B water pump requires:

• Careful cleaning of the housing.

• Proper installation of bearings and seals.

• Correct torque and alignment during reassembly.

With the right rebuild kit, operators can restore pump efficiency to near-new condition without purchasing a complete assembly.

Fresh Water Pump Seal for Caterpillar 3406B Engines

The fresh water pump seal for the Caterpillar 3406B is a small but crucial component.

Function

This seal prevents coolant from leaking around the pump shaft, maintaining correct system pressure and ensuring continuous coolant circulation.

Diesel Pro Aftermarket Advantages

• Engineered for Caterpillar 3406B: Ensures precise fitment and dependable sealing.

• Durable construction: Made with long-lasting elastomers and reinforced metal elements.

• Reliable performance: Designed for extended service life under extreme conditions.

Signs of Seal Wear

• Coolant leakage near the pump housing.

• Unexplained coolant loss.

• Overheating caused by reduced coolant levels.

Maintenance Benefits

Replacing a worn seal is an affordable and proactive way to avoid catastrophic engine overheating. Operators who service their seals regularly reduce downtime and protect major components like the cylinder head and liners.

The Role of the Fresh Water Pump in the 3406B Cooling System

How It Works

The fresh water pump uses a belt-driven impeller to circulate coolant through the block, head, and radiator. As coolant passes through, it absorbs combustion heat before returning to the radiator to be cooled and recirculated.

Importance in Heavy-Duty Operation

• Maintains consistent engine temperature.

• Supports efficient combustion and fuel economy.

• Prevents warping or cracking of major components.

• Ensures long-term engine reliability.

Why Choose Diesel Pro Power for Caterpillar 3406B Water Pump Components

Trusted Worldwide

Diesel Pro Power supports over 40,000 satisfied customers in 180+ countries, making it the global leader for Caterpillar aftermarket parts.

Fast Global Shipping

Orders ship within 24 hours and include real-time tracking, ensuring quick delivery no matter where the 3406B is operating.

Engine-Specific Catalogs

Unlike generic suppliers, Diesel Pro organizes every catalog specifically by engine. This means the 3406B section only includes parts guaranteed to fit this model.

Diesel Pro Aftermarket Quality

All pumps, rebuild kits, and seals are aftermarket solutions manufactured to withstand heavy-duty use. Operators can rely on consistent performance under the toughest conditions.

Technical Expertise

Diesel Pro provides technical support for:

• Identifying the right 3406B pump or kit.

• Installation guidance.

• Troubleshooting leaks or circulation issues.

Maintenance Best Practices for the Caterpillar 3406B Cooling System

1. Monitor coolant levels daily.

2. Inspect the water pump for leaks.

3. Replace seals before catastrophic failure.

4. Use quality coolant to prevent corrosion.

5. Flush the system regularly.