Diesel Power Holland completed a custom Caterpillar 3408 DI-TA 67U engine rebuild for a crane application — a project that required rebuilding this V8 diesel to Caterpillar factory standards with a dry exhaust configuration. The engine produces 392 kW / 525 HP at 2,100 RPM and was built to test specification 2T6224, demonstrating our capability to handle non-standard rebuild requests across heavy equipment sectors.

Caterpillar 3408 DI-TA 67U: Technical Specifications

• Engine model: Caterpillar 3408 DI-TA
• Prefix: 67U
• Application: Crane engine
• Output: 392 kW / 525 HP @ 2,100 RPM
• Test specification: 2T6224
• Exhaust system: Dry exhaust manifold and turbo
• Starting system: Electric starter
• Governor: Caterpillar 10%
• Cooling: Jacket water pump — suitable for radiator cooling
• Rebuild standard: Caterpillar factory specifications

What Is the Caterpillar 3408 DI-TA?

The Caterpillar 3408 is a 18.0-litre, V8 diesel engine produced by Caterpillar as part of the 3400 engine series. The DI-TA designation stands for Direct Injection – Turbocharged Aftercooled, identifying this as the top-performance variant within the 3408 family. The aftercooler cools the compressed intake charge after the turbocharger, increasing air density and allowing the engine to develop its full rated output of 525 HP.

The 3408 series was widely deployed across demanding applications including heavy construction equipment, cranes, marine propulsion, oilfield machinery, and generator sets. Its V8 layout delivers strong torque characteristics suited to high-load, variable-speed operation — typical of crane duty cycles.

The prefix 67U identifies the specific serial number series of this 3408 build, which is used to confirm parts compatibility, rebuild kit selection, and test specification requirements.

Crane Engine Rebuild: Dry Exhaust Configuration

Crane applications place specific demands on an engine rebuild. Unlike marine engines that typically use watercooled exhaust manifolds, crane installations commonly use dry exhaust manifolds, as the engine operates in open or semi-open environments where waterborne heat rejection is not required. The turbocharger on this build was also configured for dry exhaust operation, consistent with the original crane application.

The engine was built to Caterpillar test specification 2T6224, which defines the exact performance parameters, tolerances, and validation procedures required to confirm the rebuild meets the original factory standard for the 67U serial series.

The Rebuild process at Diesel Power Holland

Diesel Power Holland treats every special-request rebuild, including non-standard crane and heavy equipment applications with the same rigour as any production overhaul:

• Full disassembly and inspection of the V8 block, heads, and rotating assembly
• Dimensional measurement of crankshaft, cylinders, and valve train components
• Replacement of bearings, seals, gaskets, pistons, and liners to OEM specification
• Turbocharger rebuild and dry exhaust manifold installation
• Caterpillar 10% governor calibration to rated RPM
• Jacket water pump service and validation for radiator cooling compatibility
• Final test to Caterpillar test specification 2T6224

FAQ: Caterpillar 3408 DI-TA 67U Engine Rebuild

What does the 67U prefix mean on a Caterpillar 3408? The prefix 67U is the engine serial number identifier for a specific production series of the Caterpillar 3408 DI-TA. It determines which parts, rebuild kits, and test specifications apply to that engine. Using the correct prefix is essential when sourcing components or commissioning a rebuild.

What is Caterpillar test specification 2T6224? Test specification 2T6224 is a Caterpillar-defined performance validation standard for the 3408 DI-TA 67U series. It defines the parameters — including power output, oil pressure, temperatures, and RPM, that the rebuilt engine must meet before it can be released for delivery.

What is the difference between a dry and watercooled exhaust manifold on a CAT 3408? A dry exhaust manifold allows hot exhaust gases to pass through an uninsulated or air-cooled manifold directly. Watercooled manifolds circulate coolant around the manifold walls to reduce surface temperatures, required in marine and enclosed spaces. Crane and construction applications typically use dry exhaust, as the engine operates in ventilated environments.

Can the Caterpillar 3408 DI-TA be used in applications other than cranes? Yes. The 3408 DI-TA has been used across a wide range of applications including marine propulsion, offshore equipment, generator drives, compressor drives, and heavy construction machinery. Diesel Power Holland rebuilds 3408 engines to the specific configuration required by the application.

Does Diesel Power Holland handle special-request engine rebuilds? Yes. We regularly complete non-standard rebuild projects for heavy equipment, marine, and Oil & Gas customers. If your application has specific requirements around governor settings, exhaust configuration, cooling, or test specification, contact us to discuss your project.

Need a Caterpillar 3408 DI-TA Rebuilt?

Whether you need a rebuilt 3408 DI-TA from stock or a custom overhaul to your own specifications, Diesel Power Holland has the expertise and parts inventory to deliver. We have specialised in Caterpillar engine rebuilds since 1976 and ship worldwide with full export documentation.

Contact us to discuss your Caterpillar 3408 project.