Caterpillar 3406B Overhaul Kit Catalog

The Caterpillar 3406B is one of the most iconic diesel engines ever built. Known for its reliability, durability, and ease of service, the 3406B powered everything from marine vessels and industrial generators to heavy construction and mining equipment. Decades after its introduction, thousands of these engines remain in operation worldwide, a testament to Caterpillar’s engineering and the rugged design of the 3406B platform.

Even with its legendary reputation, the 3406B—like all diesel engines—experiences natural wear over time. Pistons lose compression, liners wear down, bearings develop play, and gaskets deteriorate. To restore the engine to its original power, fuel efficiency, and long service life, a complete overhaul kit is the most cost-effective solution.

Diesel Pro Power supplies Caterpillar 3406B overhaul kits matched precisely to engine arrangement numbers and serial number prefixes. With more than 40,000 satisfied customers worldwide, our company has become the trusted global source for operators who need reliable parts to keep their Caterpillar engines running at peak performance.

Why Choose a Caterpillar 3406B Overhaul Kit?

An overhaul kit for the 3406B provides far more than just replacement parts. It ensures that all critical components—pistons, liners, bearings, gaskets, and seals—are manufactured to the correct specifications for your exact engine build.

Key benefits of choosing the right overhaul kit include:

• Restored Compression – New pistons, rings, and liners reestablish proper sealing in the combustion chamber, restoring fuel efficiency and power.

• Extended Engine Life – Bearings, gaskets, and seals prevent premature wear and oil contamination.

• Cost-Effective Repairs – Bundling components into a single kit saves time, reduces shipping delays, and ensures no critical part is overlooked.

• Compatibility Assurance – Kits are matched by arrangement number and serial prefix, eliminating the risk of installing mismatched components.

Whether you operate the 3406B in a marine, industrial, or heavy equipment application, a complete overhaul kit ensures the engine is rebuilt to Caterpillar’s original standards.

Caterpillar 3406B Overhaul Kits by Arrangement Number

The Caterpillar 3406B was produced with numerous arrangement numbers, each representing subtle differences in piston design, compression ratio, and component specifications. Selecting the right kit requires identifying both the arrangement number and serial prefix from the engine’s data plate.

Rebuild Kit for Caterpillar 3406B – 14.5:1 Compression Ratio

The most common overhaul kit for the 3406B is designed for engines with a 14.5:1 compression ratio. This ratio is one of the key performance characteristics of the 3406B. It defines the relationship between cylinder volume at bottom dead center and top dead center, ultimately controlling combustion efficiency.

A 14.5:1 ratio strikes a balance between fuel economy and power output, making the 3406B a highly efficient and versatile diesel engine. Engines with this compression ratio are widely used in heavy-duty industrial and marine applications where fuel efficiency and long-term durability are critical.

Supported Arrangement Numbers:
2W1900, 7N2617, 8N9999, 1109524, 1109525, 1109698, 1778865, 1778866, 1778869, 1778870, 2W7067, 4W3800, 4W3801, 7W7264, 1315403, 1315404, 1315406, 1778873, 1778874, 1778875, 1778876, 1778877, 1778878, 1778879, 1778880, 1093830, 1093839, 1206694, 1206695, 1206700, 449630, 2385342, 2385343, 2385344, 2385345, 2385348, 2385349.

Supported Serial Number Prefixes:
91U, 4BT, 2AM, 1SS, 4BM, 4T7, PFH.

Engines carrying these identifiers can be fully restored with this in-frame rebuild kit, returning them to their original compression and efficiency standards.

Rebuild Kit for Caterpillar 3406B – Extended Arrangement Coverage

A second major rebuild kit supports additional 3406B arrangement numbers that also operate at a 14.5:1 compression ratio. These engines differ slightly in internal design and require a dedicated kit to ensure proper fitment of pistons, liners, and bearings.

Supported Arrangement Numbers:
1109524, 1109525, 1111514, 1114445, 1136986, 1778867, 1778868, 1778871, 1778872, 1784978, 1784979, 2385346, 2385347.

Supported Serial Number Prefixes:
4BT, PFH.

By using this kit, operators avoid the risk of installing mismatched pistons or gaskets, ensuring the 3406B is rebuilt according to Caterpillar’s design.

Gasket Sets for Caterpillar 3406B Engines

While overhaul kits provide pistons, liners, and bearings, gasket sets are the critical sealing components that ensure a rebuild lasts for thousands of additional service hours. Diesel Pro Power offers Caterpillar 3406B gasket sets for both in-frame repairs and full out-of-frame overhauls.

Overhaul Gasket Set for Caterpillar 3406B

The overhaul gasket set is designed for complete engine rebuilds. It includes every gasket, seal, and O-ring needed to reseal the Caterpillar 3406B after a major teardown. From cylinder head gaskets to oil pan seals, this kit provides comprehensive coverage.

Operators performing a full rebuild benefit from:

• Complete sealing coverage to prevent oil and coolant leaks

• OEM-quality materials engineered to withstand extreme heat and pressure

• Time savings by eliminating the need to order individual gaskets

This set is the preferred choice for professional shops and operators performing out-of-frame rebuilds where the engine block is fully disassembled.

In-Frame Gasket Set for Caterpillar 3406B

The in-frame gasket set is designed for situations where the 3406B remains in its chassis or engine room. Instead of a full teardown, technicians can replace pistons, liners, and head gaskets without removing the entire engine.

This set includes the gaskets most commonly required during in-frame work:

• Cylinder head gasket

• Valve cover gasket

• Intake and exhaust manifold gaskets

• Liner seals and O-rings

• Miscellaneous small seals and gaskets

In-frame gasket sets save valuable time and labor in field conditions where engine removal is not practical.

Supporting Tools for Caterpillar 3406B Overhauls

Performing an overhaul on a 3406B requires not only the right parts but also the correct specialized tools. Using improper tools risks damaging filters, seals, or housings.

• Fuel Filter Removal Wrench – Adjustable for 3-7/16" to 3-3/4", this tool simplifies filter changes during routine service or overhaul.

• Oil Filter Removal Wrench – Adjustable for 4-21/32" to 5-5/32", ensuring Caterpillar 3406B oil filters can be safely removed and reinstalled without damage.

These tools are especially valuable in marine and field applications where access is limited and proper leverage is needed.

Selecting the Right Caterpillar 3406B Overhaul Kit

Choosing the right kit comes down to four steps:

1. Check the Arrangement Number – Found on the data plate, it ensures pistons, liners, and gaskets align with the correct engine build.

2. Confirm the Serial Number Prefix – Identifies production families and avoids cross-compatibility issues.

3. Verify Compression Ratio – Ensures piston crown design and liner dimensions match the engine’s combustion requirements.

4. Consider the Application – Marine, industrial, and stationary power units may require different gasket material tolerances.

By following these steps and consulting Diesel Pro Power’s experts, operators can be certain their kit will fit the first time.

Why Diesel Pro Power for Caterpillar 3406B Overhaul Kits?

Operators choose Diesel Pro Power because:

• Exact-Fit Kits: Built specifically for Caterpillar 3406B arrangement numbers and prefixes.

• Fast Shipping Worldwide: Same-day fulfillment to reduce downtime.

• Proven Experience: Trusted by over 40,000 satisfied customers worldwide.

• Expert Support: Our team guides customers to the correct kit for their engine.

With Diesel Pro Power, operators know they are receiving parts designed to keep the Caterpillar 3406B performing at its best.

Restoring the Legendary Caterpillar 3406B

The 3406B remains one of Caterpillar’s most enduring engines, with thousands still running today. With a proper overhaul kit, operators can:

• Restore original compression and fuel efficiency

• Reduce oil consumption and emissions

• Extend engine life for decades of continued service

• Prevent unexpected failures and costly downtime

From marine engines driving vessels across oceans to industrial units powering critical facilities, the Caterpillar 3406B continues to deliver when properly maintained and overhauled.