Parts for Caterpillar 3406B – Gasket Section

The Caterpillar 3406B is one of the most trusted heavy-duty diesel engines in marine, industrial, and on-highway applications. Its continued reputation for durability relies heavily on proper sealing components. Gaskets, seals, and spacer plates form the backbone of engine integrity—preventing leaks, maintaining compression, and ensuring the longevity of major components.

Below is a detailed breakdown of the gasket solutions available for the Caterpillar 3406B engine, designed and supplied by Diesel Pro Power to meet the demands of operators worldwide.

Overhaul Gasket Set for Caterpillar 3406B Engines

The complete overhaul gasket set provides every major seal and gasket required for a full engine rebuild. This kit is essential when an engine is removed from service for a major overhaul. It ensures that every surface—from cylinder heads to oil passages—is resealed to factory-tight tolerances.

• Includes gaskets for top-end and bottom-end rebuild.

• Built with heavy-duty aftermarket materials to withstand high compression and thermal cycling.

• Recommended when refreshing the entire engine to restore OEM-level performance.

In-Frame Gasket Set for Caterpillar 3406B

For operators servicing the 3406B while the engine remains in the chassis or in the engine room, the in-frame repair gasket set is the go-to choice. It contains all seals needed for top-end work without requiring a full tear-down.

• Designed for partial rebuilds or cylinder head replacement.

• Eliminates the need to source individual gaskets.

• Saves downtime by streamlining in-chassis service.

Cylinder Head Spacer Plate

The spacer plate is a critical component located between the cylinder head and block on the 3406 family of engines. Over time, this plate can warp or degrade, leading to compression loss or coolant leaks.

• Restores a proper sealing surface between head and block.

• Manufactured with precision thickness tolerances to maintain compression ratio.

• Essential when installing a new cylinder head or gasket.

Cylinder Head Gasket Set for 3406B and 3406C

This set provides the required gaskets to reseal the cylinder head assembly. Whether replacing the head, performing valve work, or addressing combustion leaks, this set ensures a complete reseal.

• Includes intake, exhaust, and head gaskets.

• Engineered for high-pressure diesel combustion environments.

• Compatible with both 3406B and 3406C applications.

Cylinder Head Gasket

For operators who only require the primary head gasket, this individual replacement option is available. The gasket itself is critical for sealing combustion chambers and coolant passages.

• Reinforced construction prevents blow-by and coolant seepage.

• Designed for the extreme pressures of the 3406B.

• Ideal for targeted repairs without replacing full gasket sets.

Aftercooler Gasket

The aftercooler gasket ensures a leak-free seal where the aftercooler mounts. A proper seal prevents air leaks that can lead to performance loss or improper air-fuel ratios.

• Maintains boost pressure integrity.

• Resists heat and vibration common in turbocharged applications.

• Simple but vital in maintaining efficiency.

Intake Manifold Gasket

Each 3406B engine requires six intake manifold gaskets—one per port. These gaskets are often overlooked but are critical for balanced airflow across all cylinders.

• Seals intake runners to prevent air leaks.

• Maintains consistent combustion performance.

• Durable material resists thermal cycling and intake pressures.

Oil Pan Gasket

The oil pan gasket seals the mating surface between the block and oil pan, preventing oil leaks that can lead to lubrication failure.

• Heavy-duty construction resists oil saturation.

• Provides long-term sealing in harsh vibration conditions.

• Designed specifically for the 3406B’s oil pan geometry.

Exhaust Manifold Gasket

Located between the cylinder head and exhaust manifold, this gasket prevents exhaust leaks and protects the engine from hot gas erosion.

• Ensures proper exhaust flow to turbocharger or stack.

• Prevents dangerous under-hood heat escape.

• Built for the high-heat environment of diesel exhaust systems.

Air Compressor Gasket

The air compressor gasket maintains a leak-free seal between the compressor and the 3406B block. This is especially important in heavy-duty trucks and equipment where compressed air is essential for braking and auxiliary systems.

• Precision fit for reliable compressor operation.

• Resists oil seepage and vibration.

• Critical for safety-related air systems.

Turbocharger Gasket

The turbo gasket provides a tight seal at the turbocharger connection. Even small leaks can cause boost loss, exhaust restriction, or excessive soot buildup.

• Ensures full boost pressure is delivered to the intake.

• Heat-resistant material handles extreme turbo exhaust temperatures.

• One required per turbocharger installation.

Front Cover Gasket

The front cover gasket seals the timing gear cover to the block, preventing oil leaks and contamination.

• Designed specifically for the 3406B and 3406C front cover profile.

• Prevents oil seepage around rotating timing gears.

• Vital for maintaining lubrication integrity.

Water Pump Gasket Seal

This gasket seals the water pump to the block, ensuring that coolant circulates efficiently without leaks.

• Prevents coolant seepage that can lead to overheating.

• Designed for long-term durability under fluctuating thermal loads.

• A small but essential part of the 3406B cooling system.

Front Crankshaft Seal

The front crankshaft seal prevents oil leakage at the crank pulley end. On the 3406B, this is a high-wear area due to constant rotation and load.

• Heavy-duty lip construction resists wear.

• Helps maintain crankcase pressure balance.

• Essential for keeping oil where it belongs—inside the engine.

Rear Crankshaft Seal

The rear crankshaft seal prevents oil leakage at the flywheel end of the crankshaft. A compromised rear seal can lead to severe oil loss and contamination of the clutch or transmission.

• Engineered for the high loads of the 3406B crankshaft.

• Precision fitment prevents costly oil leaks.

• Designed for long service life in demanding applications.

Why Choose Diesel Pro Power for Caterpillar 3406B Gasket Parts

• Global Trust – Over 40,000 satisfied customers in more than 180 countries rely on Diesel Pro Power for genuine aftermarket gasket solutions.

• Fast Shipping – All orders ship within 24 hours and include real-time tracking.

• Engine-Specific Catalogs – Every gasket in this catalog is designed for the Caterpillar 3406B—no guesswork, no mismatches.

• Heavy-Duty Durability – Diesel Pro aftermarket gaskets are manufactured to perform in marine, industrial, and on-highway applications.

• Expert Support – Caterpillar specialists are available to provide installation tips, torque specifications, and maintenance guidance.