Parts for Caterpillar 3412 – Crankshaft Section

The crankshaft system is the beating heart of the Caterpillar 3412, 3412C, and 3412E engines. Responsible for converting combustion energy into rotational power, the crankshaft and its related components ensure smooth operation, durability, and performance across a wide range of heavy-duty applications. Whether your 3412 powers a marine vessel, a generator, or heavy equipment in mining and construction, keeping the crankshaft assembly in optimal condition is essential for reliable uptime.

Diesel Pro Power offers a complete selection of premium aftermarket Caterpillar 3412 crankshaft components. Each part is engineered to meet or exceed OEM performance standards, ensuring long service life, precise fit, and dependable operation in the harshest environments.

Complete Crankshaft Assemblies for Caterpillar 3412 Engines

Rebuilding or replacing a crankshaft in the Caterpillar 3412 series requires precision. We carry both wide-bearing and standard-bearing design options, depending on your specific 3412 configuration. These assemblies are manufactured from high-strength steel and machined to exact tolerances, delivering the durability required for high-horsepower engines.

• Wide Bearing Design Crankshaft – Built to handle higher load distribution, reducing localized wear and extending engine life.

• Standard Design Crankshaft – Engineered for dependable performance across standard operating conditions, suitable for many industrial and marine applications.

Each crankshaft is ready for installation, precision-balanced, and inspected to ensure consistent performance throughout its service cycle.

Crankshaft Gears for Caterpillar 3412

The crankshaft gear is responsible for timing synchronization within the 3412’s internal components, including the camshaft and fuel system. Diesel Pro Power supplies gears in multiple tooth configurations, allowing operators to select the correct option for their build.

• 80-Tooth Crankshaft Gear – Commonly used in specific 3412 applications requiring precise gear meshing.

• 99-Tooth Crankshaft Gear – Designed for alternate configurations of the 3412, ensuring proper engagement with camshaft gears and other timing components.

Every gear is manufactured with heat-treated steel for durability and tested for alignment accuracy to prevent premature wear.

Crankshaft Dowel Pins for Caterpillar 3412

Dowel pins are essential for securing crankshaft gears in place and ensuring that timing remains consistent throughout the engine’s operation. Even small misalignments can lead to vibration, timing issues, and costly failures.

Diesel Pro Power offers precision-machined dowel pins compatible with both 80-tooth and 99-tooth gear configurations. Each pin is built for exact fitment, preventing slippage and protecting surrounding crankshaft components.

Main Bearings for Caterpillar 3412 Engines

Main bearings support the crankshaft inside the engine block, allowing it to rotate smoothly under heavy load. Over time, these bearings wear due to friction, oil contamination, or high-stress operation. Replacing them during rebuilds is critical for restoring engine reliability.

We supply a full range of Caterpillar 3400-series main bearings, including the 3412, in various size options:

• Standard Size Bearings – Ideal for engines where crank journals are within factory specifications.

• Oversize .010” Bearings – Designed for crankshafts that have been ground .010” undersize.

• Oversize .025” Bearings – Provides secure fitment after deeper regrinding procedures.

• Oversize .050” Bearings – Built for engines that require maximum machining adjustments.

Each bearing set is coated for superior oil retention and built to withstand extreme pressure, ensuring the crankshaft operates without excessive friction or wear.

Thrust Washers for Caterpillar 3412

Thrust washers keep the crankshaft aligned axially, preventing forward and backward movement that can damage internal components. Each 3412 engine requires two thrust washers during assembly.

Our aftermarket thrust washers are built with reinforced materials, providing long-term resistance to friction, heat, and heavy loads. Proper thrust washer replacement ensures smooth engine timing and extends crankshaft service life.

Vibration Dampers for Caterpillar 3412

High-horsepower engines like the Caterpillar 3412 generate significant torsional vibrations during operation. Without proper damping, these vibrations can cause crankshaft fatigue, gear damage, and premature bearing wear.

Diesel Pro Power supplies premium vibration dampers specifically designed for the 3412 engine. These components absorb harmful harmonics, reduce vibration stress, and extend the service life of the entire crankshaft assembly.

Crankshaft Seals for Caterpillar 3412

Preventing oil leaks at the crankshaft ends is vital for protecting both engine performance and operator safety. Diesel Pro Power offers precision-engineered seals for both the front and rear of Caterpillar 3412 crankshafts.

• Front Crankshaft Seals – Designed to keep oil contained while preventing contaminants from entering the timing housing.

• Rear Crankshaft Seals – Built to secure the flywheel end of the crankshaft, protecting the rear main bearing area from oil leakage.

Each seal is manufactured with durable elastomer materials, capable of withstanding high heat and oil exposure, ensuring long-lasting reliability.

Why Buy Caterpillar 3412 Crankshaft Parts from Diesel Pro Power

Trusted by 40,000+ Customers Worldwide
Diesel Pro Power serves operators in over 180 countries, supplying parts to industries that demand reliability above all else. From global shipping fleets and offshore drilling platforms to remote mining sites and large-scale industrial facilities, our Caterpillar 3412 crankshaft parts are proven to perform in some of the most challenging conditions on the planet. This reputation for trust and consistency is why professional operators return to us for every rebuild and service need.

Premium Aftermarket Quality
Every crankshaft, gear, bearing, washer, and seal we carry is engineered to meet or exceed Caterpillar performance standards. That means exacting tolerances, durable metallurgy, and dependable fitment across all Caterpillar 3412 engine models. Whether you are restoring an engine for continuous marine duty, heavy equipment operations, or power generation, our aftermarket parts ensure long service life, reduced maintenance intervals, and confidence in every repair.

Fast Worldwide Shipping
Downtime translates directly into lost revenue, which is why we prioritize speed and efficiency in logistics. Diesel Pro Power offers expedited global shipping solutions to keep your Caterpillar 3412 engine back in service as quickly as possible. Whether your vessel is docked at a major international port or your equipment is stationed in a remote region, we make sure critical crankshaft parts reach you without delays.

Dedicated Caterpillar 3412 Catalog
Navigating a parts catalog should never be confusing. Our Caterpillar 3412 crankshaft section is organized by system and component, making it easy to identify exactly what you need—whether that’s a complete crankshaft assembly, main bearings in standard or oversize options, thrust washers, vibration dampers, or sealing components. By structuring our catalog around the engine’s rebuild process, we save operators time and reduce the risk of ordering errors.

Expert Technical Support
Installing crankshaft components in a high-performance Caterpillar 3412 engine requires more than just the right parts—it requires knowledge. Our technical team provides step-by-step guidance, helping customers select between wide and standard bearing designs, determine proper oversize bearing dimensions, and ensure correct installation of vibration dampers and seals. This personalized support helps operators avoid costly mistakes, protect their engines, and maximize service life after every rebuild.