Parts for Caterpillar 3412E – Crankshaft Section

The crankshaft assembly is the backbone of every Caterpillar 3412E engine, transforming linear piston motion into rotational power that drives everything from marine propulsion to heavy construction equipment. For operators who depend on maximum uptime and reliability, having access to high-quality crankshaft components is critical. At Diesel Pro Power, we supply premium aftermarket crankshaft parts for the Caterpillar 3412E and related 3400 Series engines, ensuring your engine continues to perform under the toughest conditions.

Below is a detailed catalog of Caterpillar 3412E crankshaft parts, with explanations of function, compatibility, and the role each component plays in keeping your engine running smoothly.

Complete Crankshafts for Caterpillar 3412E

New Replacement Crankshafts

A replacement crankshaft is one of the most important components during a major engine rebuild. Designed to meet or exceed Caterpillar specifications, our aftermarket crankshafts provide the durability needed for high-horsepower applications.

The crankshaft in the 3412E is built from forged steel and undergoes precision machining to maintain exact tolerances. Key features include:

• Wide Bearing Design for enhanced load distribution.

• Hardened Journals to resist wear during long service intervals.

• Perfect Compatibility with 3412, 3412C, and 3412E engines.

Whether your crankshaft has suffered from scoring, cracking, or metal fatigue, a full replacement ensures restored performance and reliability for thousands of additional operating hours.

Crankshaft Gears

Precision-Machined Crankshaft Gears

The crankshaft gear drives the timing gear train, ensuring proper synchronization between the camshaft, fuel injection system, and auxiliary drives. In the 3412E, precise timing is critical for combustion efficiency and engine reliability.

• High-Strength Alloy Construction provides long service life even under heavy vibration.

• Exact Tooth Count ensures perfect mesh with mating gears.

• Available in Multiple Tooth Configurations to suit different engine builds.

A worn crankshaft gear can cause timing irregularities, increased vibration, and eventually catastrophic engine damage. Replacing this gear as part of a rebuild is essential for protecting your investment.

Dowel Pins and Alignment Components

Crankshaft Dowel Pins

Dowel pins secure gears and components to the crankshaft, preventing misalignment and maintaining gear train integrity. In heavy-duty Caterpillar engines like the 3412E, even a small alignment issue can cause rapid wear and damage.

• Precision Ground for Fitment ensuring exact placement on the shaft.

• Engineered for High Stress to withstand torque loads.

• Compatibility Across the 3400 Series including 3406, 3408, and 3412 models.

Regular inspection of dowel pins during rebuilds prevents future gear train failures.

Main Bearings for Caterpillar 3412E

The main bearings are critical to supporting the crankshaft inside the engine block. They maintain proper oil clearance, reduce friction, and ensure smooth rotation at thousands of revolutions per minute. Diesel Pro Power offers a full range of main bearings for standard rebuilds and oversized options for engines that have undergone crankshaft grinding.

Standard Size Main Bearings

These bearings are designed for crankshafts that remain within factory specifications. They deliver:

• High Load Capacity for large displacement diesel engines.

• Precision Fitment ensuring correct oil film thickness.

• Durability under continuous high-horsepower operation.

Oversized Main Bearings

When crankshaft journals are worn or reground, oversized bearings restore correct tolerances. Available in several increments:

• .010” Oversize Bearings for minor regrinds.

• .025” Oversize Bearings for moderate wear.

• .050” Oversize Bearings for heavily worn journals.

Using the correct oversize bearing ensures long service life and proper lubrication of the crankshaft.

Thrust Washers for Caterpillar 3412E

Thrust washers control the axial movement of the crankshaft, preventing it from shifting forward or backward under heavy loads. Without properly functioning thrust washers, operators may experience:

• Premature wear on the crankshaft and bearings.

• Excessive end play leading to gear misalignment.

• Damage to the oil film between rotating components.

Our aftermarket thrust washers are manufactured to exact tolerances, ensuring dependable crankshaft positioning throughout the life of the engine.

Vibration Dampers

Heavy-Duty Vibration Dampers

The vibration damper, sometimes called a harmonic balancer, reduces torsional vibrations generated by the crankshaft. For large-displacement engines like the Caterpillar 3412E, vibration control is critical to:

• Extend crankshaft life.

• Reduce stress on bearings and gears.

• Improve operator comfort in marine and industrial applications.

Over time, dampers can degrade, losing their ability to absorb vibration. Replacing the damper during an overhaul helps protect the crankshaft from stress fractures and ensures smoother operation.

Crankshaft Seals

Front and Rear Seals

The crankshaft must be sealed at both ends to keep oil contained and contaminants out. High-quality seals are essential for preventing leaks that can lead to oil starvation and premature engine failure.

• Front Crankshaft Seals protect against oil leakage near the timing gear cover.

• Rear Crankshaft Seals provide sealing at the flywheel housing.

• Premium Elastomer Materials resist heat, pressure, and chemical breakdown.

Worn seals are one of the most common causes of oil leaks in Caterpillar 3412E engines, making seal replacement an essential part of any rebuild.

Complete Crankshaft Rebuild Kits

For operators who want everything in one package, Diesel Pro Power offers complete crankshaft rebuild kits for the Caterpillar 3412E. These kits include:

• New crankshaft or reconditioned equivalent.

• Full set of main bearings in required sizes.

• Thrust washers.

• Front and rear seals.

• Alignment dowel pins and washers.

• Optional vibration damper and gear replacement.

By sourcing all components together, you ensure compatibility and reduce downtime during engine rebuilds.

Why Buy Caterpillar 3412E Crankshaft Parts from Diesel Pro Power

Trusted by 40,000+ Customers Worldwide

Diesel Pro Power supports operators in over 180 countries, from marine fleets and offshore platforms to mining operations and power plants. Our proven track record ensures you are working with a trusted supplier.

Premium Aftermarket Quality

Every crankshaft, bearing, seal, gear, and washer is manufactured to meet or exceed Caterpillar performance standards. Precision engineering ensures perfect compatibility and long-lasting reliability.

Fast Worldwide Shipping

Downtime costs money. We minimize delays with expedited global shipping, ensuring your Caterpillar 3412E crankshaft components arrive when you need them most.

Dedicated Caterpillar 3412E Catalog

Our catalog is organized by system and component type, making it easy to find exactly what you need—without the confusion of mixed or outdated listings.

Expert Technical Support

Rebuilding a 3412E crankshaft assembly requires knowledge and precision. Our technical team provides guidance on:

• Selecting the correct bearing size.

• Installing vibration dampers.

• Identifying early wear patterns.

• Proper torqueing and alignment practices.

Applications of the Caterpillar 3412E Crankshaft

The Caterpillar 3412E engine is trusted across multiple industries, including:

• Marine Propulsion: Fishing vessels, cargo ships, and offshore supply vessels.

• Industrial Power: Stationary power generation units and pumping stations.

• Construction & Mining: Large earthmovers, excavators, and drilling equipment.

In every application, the crankshaft serves as the core power-delivery component, making quality replacement parts vital to productivity and uptime.