Connecting Rod

Parts for Caterpillar 3412B – Connecting Rod Section

The Caterpillar 3412B engine is a powerful V12 design widely used in industrial, marine, and heavy-duty applications. The connecting rod assembly is one of the most critical internal components, linking the piston to the crankshaft and transferring combustion force into rotational energy. Over time, connecting rods and their related hardware—bearings, bushings, bolts, and nuts—may wear out and require replacement to ensure reliable performance. Diesel Pro Power offers a complete selection of Caterpillar 3412B connecting rods and related components built to OEM-quality standards for strength, durability, and fitment.

Connecting Rods for Caterpillar 3412B

We carry replacement connecting rods suitable for various combustion configurations used in Caterpillar 3400 series engines, including the 3412B. Options include:

• Straight Rod (Pre-Combustion Style): Designed for older style 3400 series applications, these rods provide robust support for engines using pre-combustion chamber technology.

• Narrow Taper Rod (6 Degrees, Pre-Combustion): Built to match Caterpillar’s pre-combustion narrow taper requirements, ensuring smooth load transfer and balance at high stress levels.

• Wide Taper Rod (Direct Injection Style): Designed for engines like the 3412B that use direct injection systems. The wider taper design provides improved contact surface and enhanced durability under high horsepower loads.

Each connecting rod is precision-machined to Caterpillar specifications and ready for direct installation.

Connecting Rod Bolts & Nuts

High-strength fasteners are essential for keeping the connecting rod securely clamped around the crankshaft journal. Diesel Pro offers:

• Connecting Rod Bolts – Designed for heavy-duty use, each rod requires two bolts to secure it to the crankshaft.

• Connecting Rod Nuts – Precision-threaded nuts built for the 3400 series. Each rod requires two nuts per installation.

Replacing bolts and nuts during every major overhaul or rebuild is strongly recommended to prevent fatigue or loosening under extreme engine conditions.

Connecting Rod Bushings for Caterpillar 3412B

Rod bushings allow smooth pivoting of the connecting rod around the piston pin. We provide OEM-quality bushings in multiple widths to service all Caterpillar 3400 series rod styles:

• Straight Rod Bushings – For pre-combustion straight rods.

• Narrow Taper Rod Bushings – Sized for 6-degree taper applications.

• Wide Taper Rod Bushings – Designed for direct injection wide taper rods, ensuring proper fit and long-lasting durability.

These bushings restore proper clearances and reduce wear between piston pin and connecting rod.

Connecting Rod Bearings for Caterpillar 3412B

Rod bearings form the contact surface between the connecting rod and the crankshaft journal. To ensure compatibility with various crankshaft wear conditions, Diesel Pro Power stocks:

• Standard Size Bearings (Narrow and Wide) – For engines with standard crankshaft dimensions.

• Oversize Bearings – Available in increments (.010, .025, .050) for both narrow and wide rod designs. These are used when the crankshaft has been ground undersize during reconditioning, restoring proper oil clearance and load distribution.

Every bearing is manufactured for high load-carrying capacity and precision oil channeling, reducing friction and extending crankshaft and rod life.

Why Choose Diesel Pro Power for Caterpillar 3412B Connecting Rods

• Trusted by 40,000+ Customers Worldwide – Backed by decades of service in the diesel engine parts industry.

• OEM-Quality Fit and Finish – All connecting rods, bushings, bearings, and fasteners are manufactured to Caterpillar standards.

• Fast Global Shipping – Get your parts delivered quickly, reducing costly downtime.

• Dedicated 3412B Catalog – Browse with confidence, knowing every listed part is specific to the Caterpillar 3412B and compatible engines in the 3400 family.

• Expert Technical Support – Our specialists can help you identify the correct rod style, bearing size, or bushing width for your specific engine arrangement number or rebuild requirements.