Crankshaft

Parts for Caterpillar 3408B – Crankshaft Section

The crankshaft is the beating heart of any diesel engine, and for the Caterpillar 3408B, its reliability and precision engineering are critical to delivering long service life. At Diesel Pro Power, we provide a complete range of crankshaft components and related parts for the 3408B, ensuring operators can perform full engine rebuilds or targeted repairs with confidence.

Whether you’re replacing a worn crankshaft, installing new bearings, or sourcing vital accessories like thrust washers, vibration dampers, or seals, our dedicated 3408B catalog gives you direct access to OEM-grade solutions designed to restore performance and extend engine life.

New Crankshafts for Caterpillar 3408B Engines

The 3408B crankshaft is designed to withstand immense combustion forces and transfer power efficiently through the engine’s rotating assembly. Our replacement crankshafts are offered in both wide and narrow connecting rod bearing configurations, allowing you to match the correct style for your specific arrangement.

Each crankshaft is precision-engineered and balanced to Caterpillar specifications, ensuring smooth operation, reduced vibration, and compatibility with existing rods, pistons, and bearings.

Main Bearings for Caterpillar 3408B Crankshafts

Main bearings support the crankshaft and allow it to rotate smoothly within the engine block. Over time, these bearings wear, leading to oil clearance issues, vibration, and potential crankshaft damage if left unattended.

We carry a complete selection of main bearings for the 3408B, available in:

Standard size bearings – ideal for engines where the crankshaft journals remain within factory tolerance.
Oversize bearings – available in incremental steps (.010, .025, .050) for situations where crankshaft journals have been ground undersize during a rebuild.

By offering multiple size options, Diesel Pro Power ensures operators can source the exact bearings needed for proper clearances and oil film strength.

Thrust Washers for Caterpillar 3408B Engines

Thrust washers are small but vital components that prevent axial movement of the crankshaft. In a heavy-duty engine like the 3408B, excessive end-play can cause severe wear on connecting rods and the block.

Our thrust washers are manufactured to Caterpillar standards and installed in pairs for full protection. Replacing them during every major overhaul is highly recommended to ensure consistent crankshaft alignment and stability.

Vibration Dampers for Caterpillar 3408B

Vibration dampers (also called harmonic balancers) absorb and dissipate torsional vibrations that occur in the crankshaft as the engine fires. Without a functioning damper, crankshaft fatigue and eventual failure are likely.

Our dampers are engineered to handle the high torque of the 3408B, ensuring reduced stress on the crankshaft and smoother operation across a wide RPM range. Many operators choose to replace the vibration damper during major engine rebuilds for added protection.

Crankshaft Gears and Dowel Pins

The crankshaft gear drives critical timing components, ensuring precise synchronization between the crankshaft, camshaft, and fuel injection system. For the Caterpillar 3408B, Diesel Pro Power offers OEM-grade crankshaft gears designed for durability and accuracy.

To complement this, crankshaft dowel pins are also available. These small but essential pieces secure the gear in perfect alignment, preventing timing drift and ensuring long-term reliability under high load conditions.

Front and Rear Crankshaft Seals

Crankshaft seals protect against oil leaks at the front and rear of the engine. On high-horsepower engines like the 3408B, maintaining proper oil containment is critical for lubrication and preventing contamination of surrounding components.

Front seals – mounted at the timing cover, they prevent oil from escaping around the crankshaft pulley.
Rear seals – installed near the flywheel housing, they ensure leak-free performance at the back of the engine.

We provide both front and rear seals designed to withstand extreme heat, pressure, and long-term operation.

Why Buy Caterpillar 3408B Crankshaft Parts from Diesel Pro Power

Operators worldwide choose Diesel Pro Power as their trusted source for Caterpillar 3408B crankshaft parts, and with good reason. When you are dealing with an engine as critical as the 3408B, you need a supplier that offers both quality and dependability. Here’s why thousands of customers continue to rely on us:

Global Customer Base – More than 40,000 satisfied customers across 180+ countries trust Diesel Pro Power to keep their Caterpillar engines running at peak efficiency. From large commercial fleets to independent operators, our reach demonstrates the reliability and consistency we deliver worldwide.
OEM-Grade Quality – Every crankshaft, bearing, washer, gear, seal, and vibration damper we sell is built to meet or exceed Caterpillar’s strict engineering standards. This ensures not only a perfect fit but also durability under the extreme pressures and loads that the 3408B engine is known for. You can install our components with confidence knowing they are designed for long-term performance.
Comprehensive Catalog – Our Caterpillar 3408B catalog is organized by system and component, making it easier than ever to locate exactly what you need. Whether you are sourcing a full crankshaft replacement, oversize bearings for a rebuild, or seals to stop oil leaks, our streamlined catalog eliminates guesswork and saves valuable time during repairs.
Fast Worldwide Shipping – Downtime costs money, which is why we prioritize speed and reliability in every order. Our global shipping network allows us to get parts quickly to customers anywhere in the world—whether your 3408B engine is powering a vessel offshore, a mining operation, or a generator in a remote region.
Expert Technical Support – The Caterpillar 3400-series has unique requirements, and our team understands them in detail. From identifying the correct bearing size to ensuring compatibility with your arrangement and serial number, our specialists are here to guide you through the process. This expert assistance helps prevent costly mistakes and ensures you receive the right part the first time.
Proven Reputation – With decades of experience supporting heavy-duty operators, Diesel Pro Power has built a reputation for trust and reliability. Our customers return not only for the parts but also for the peace of mind that comes with knowing their equipment is backed by professional-grade solutions.

Applications of the Caterpillar 3408B Crankshaft

The 3408B engine is widely used in marine propulsion, power generation, oilfield equipment, mining machinery, and heavy construction. The crankshaft, as the central rotating component, directly influences reliability in these demanding applications.

By installing new crankshaft components from Diesel Pro Power, operators ensure their Caterpillar 3408B engines continue delivering maximum uptime and performance in harsh environments.