Camshaft

Parts for Caterpillar 3412B – Camshaft Section

The Caterpillar 3412B engine is a powerhouse relied upon in marine propulsion, offshore drilling, power generation, and heavy industrial applications. At the heart of this engine’s performance lies its camshaft system. The camshaft, along with its bushings, gears, lifters, and supporting components, ensures precise valve timing and optimal combustion cycles. A properly functioning camshaft assembly is critical to maintaining horsepower, fuel efficiency, and durability in demanding operating conditions.

At Diesel Pro Power, we offer a dedicated catalog of Caterpillar 3412B camshaft parts engineered to OEM specifications, trusted by more than 40,000 satisfied customers worldwide. Whether you are performing a full engine overhaul or a targeted repair, our catalog provides everything you need for long-term reliability.

Camshaft for Caterpillar 3412B Marine Engines

The camshaft is the central component of the valve timing system, controlling the opening and closing of intake and exhaust valves. For the Caterpillar 3412B, the camshaft is designed for heavy-duty marine applications where continuous operation and high torque output are essential.

• Engine Serial Coverage: Compatible with multiple Caterpillar prefix serial numbers including 3JK, 5RL, 60M, 7BL, 7HG, RLR, RTY, 9BR, and REA.

• Performance Benefits: Ensures precise valve actuation for smooth combustion, consistent power delivery, and reduced emissions.

• Durability: Manufactured to withstand high stress, thermal expansion, and long service intervals typical of 3412B engines in marine environments.

This camshaft is an essential replacement for marine operators who need reliable performance under continuous heavy loads.

Camshaft Woodruff Key for Caterpillar 3412B

A small but critical component, the camshaft Woodruff key locks the camshaft gear securely to the camshaft shaft. Without a properly fitted key, valve timing could slip, leading to severe engine damage.

• Applications: Used in both Caterpillar 3406 and 3412 engine families.

• Function: Maintains precise synchronization between crankshaft and camshaft rotation.

• Reliability: Machined for a perfect OEM-fit to ensure long-term stability in high-torque conditions.

Though inexpensive, the Woodruff key plays a major role in ensuring your 3412B runs with exact timing and reliability.

Camshaft Bushings for Caterpillar 3412B

Bushings provide smooth camshaft rotation within the engine block, minimizing friction and wear. A worn camshaft bushing can cause misalignment, excessive noise, or even catastrophic failure. We offer two options for Caterpillar 3412B engines:

Standard Camshaft Bushing – 1.00" Wide

• Provides stable camshaft support in standard load conditions.

• Ideal for standard rebuilds and consistent operating environments.

• Designed to reduce wear, keeping the camshaft aligned and rotating smoothly.

Wide Camshaft Bushing – 1.30" Wide

• Offers additional support for high-load or high-RPM marine applications.

• Extra width helps distribute loads evenly, reducing stress on the camshaft journal.

• Recommended for engines operating under continuous heavy workloads, such as tugboats, ferries, and offshore platforms.

Both options are engineered for Caterpillar precision, ensuring extended service life and reduced downtime.

Camshaft Gear for Caterpillar 3412B

The camshaft gear is responsible for transferring rotational force from the crankshaft to the camshaft, ensuring valves open and close at precisely the right time.

• Specifications: 86-tooth gear specifically designed for Caterpillar 3408 and 3412 engines.

• Strength: Heat-treated and precision-cut to handle extreme torque loads without premature wear.

• Application: Perfect for complete overhauls or when replacing worn or damaged camshaft gears in the 3412B.

With the right gear installed, your camshaft timing remains synchronized, preserving performance and avoiding misfires or timing issues.

Valve Lifters (Tappets) for Caterpillar 3412B

Valve lifters, or tappets, transfer the rotational movement of the camshaft into linear motion to open and close valves.

• Application: Compatible with Caterpillar 3406, 3408, and 3412 families.

• Function: Ensures smooth valve movement and consistent timing cycles.

• Durability: Built to resist wear under the constant high-pressure contact between camshaft lobes and pushrods.

Replacing valve lifters during a rebuild is critical to prevent uneven wear on new camshaft lobes and to extend engine service life.

Why Choose Diesel Pro Power for Caterpillar 3412B Camshaft Parts

• Trusted by 40,000+ Customers Worldwide – Diesel Pro Power has earned global recognition for reliability and service.

• OEM-Quality Manufacturing – Every camshaft, bushing, gear, and lifter is built to Caterpillar specifications for guaranteed performance.

• Fast Global Shipping – We minimize downtime with quick, reliable shipping no matter where you operate.

• Dedicated 3412B Catalog – Our organized catalog ensures you can find the exact component you need without confusion.

• Expert Support – Our technical team can assist you in selecting the correct camshaft components for your specific engine build.