Parts for Caterpillar 3412E – Connecting Rod Section

The Caterpillar 3412E is a legendary V12 diesel engine known for its durability, performance, and widespread use in marine, industrial, and power generation applications. To keep these engines running at peak efficiency, maintaining the integrity of the connecting rod assembly is essential. Diesel Pro Power supplies premium connecting rods, bearings, bushings, bolts, and nuts for the Caterpillar 3412E, designed to OEM specifications for guaranteed fit and long-lasting performance.

Below you’ll find our complete catalog of connecting rod parts and related components for the Caterpillar 3412E engine.

Connecting Rods for Caterpillar 3412E Engines

Direct Injection Wide Taper Rods

The connecting rods for Caterpillar 3412E engines are engineered for direct injection systems, featuring a wide taper design that provides added strength and stability. These rods are precision-machined to handle the extreme stresses of heavy-duty diesel operation. They help ensure that combustion forces are transferred efficiently from the piston to the crankshaft, reducing wear and prolonging engine life.

Applications: Caterpillar 3412E industrial, marine, and generator engines.

Connecting Rod Bolts for Caterpillar 3412E

Heavy-Duty Bolts for Wide Taper Rods

Specialized connecting rod bolts are required for Caterpillar 3412E rods to maintain tight clamping force under high-compression diesel cycles. These bolts are heat-treated for maximum durability and are designed specifically for the direct injection wide taper rods used in the 3412E.

• Two bolts are required per connecting rod.

• Manufactured to OEM strength and hardness standards.

Additional Bolt Options

Alternate bolt configurations are also available for certain rod designs within the Caterpillar 3412E family, ensuring compatibility across different engine arrangements.

Connecting Rod Nuts for Caterpillar 3412E

Wide Taper Rod Nuts

Connecting rod nuts for Caterpillar 3412E engines are built to work with the heavy-duty bolts that secure each rod. These nuts provide consistent torque retention, ensuring that the rod remains properly clamped to the crankshaft during high-stress operation.

Standard Rod Nuts for 3400 Series

For variations within the Caterpillar 3400 engine family, additional nut designs are available. Each rod requires two nuts, and they are designed to resist loosening even under vibration and heavy loads.

Connecting Rod Bushings for Caterpillar 3412E

Direct Injection Wide Taper Rod Bushings

Bushings (also called small-end bearings) are critical to reduce friction where the connecting rod meets the piston pin. For the Caterpillar 3412E, bushings are available in heavy-duty bronze construction with a width of 1.88 inches. These bushings are designed to handle the oscillating motion of the piston pin and maintain proper lubrication throughout operation.

• Designed to service direct injection wide taper rods.

• Precision-machined for exact fit and reduced wear.

Connecting Rod Bearings for Caterpillar 3412E

The connecting rod bearings for Caterpillar 3412E engines play a vital role in maintaining smooth rotation between the rod and crankshaft. Diesel Pro Power offers a complete range of rod bearings in both standard and oversize dimensions, ensuring proper fit during rebuilds and overhauls.

Narrow Bearings for 3400 Series Engines

• Standard Size Bearings: Provide a factory-spec fit for Caterpillar 3412E rods.

• Oversize Bearings: Available in .010”, .025”, and .050” increments. Oversize bearings are used when the crankshaft journal has been ground undersize during reconditioning.

Wide Bearings for 3400 Series Engines

• Standard Size Bearings: For wide taper rods, offering increased surface contact and load distribution.

• Oversize Bearings: Offered in .010”, .025”, and .050” sizes. These bearings restore proper clearances after crankshaft machining and extend the life of rebuilt engines.

Why Maintaining Your 3412E Connecting Rod Assembly Matters

The connecting rod assembly in a Caterpillar 3412E is one of the most critical moving groups inside the engine. Worn or damaged rods, bushings, or bearings can lead to:

• Excessive vibration and noise.

• Loss of compression and engine efficiency.

• Severe crankshaft damage if a bearing fails.

• Costly downtime and repairs.

By replacing connecting rods, bolts, nuts, bushings, and bearings at recommended intervals—or anytime wear is detected—you protect the heart of your Caterpillar 3412E engine.

Why Order Caterpillar 3412E Connecting Rod Parts from Diesel Pro Power

• Trusted by 40,000+ customers worldwide – Diesel Pro Power is the go-to source for heavy-duty Caterpillar parts, delivering reliability and performance.

• OEM-quality parts – Every rod, bolt, nut, bushing, and bearing is built to Caterpillar specifications for guaranteed fit.

• Fast worldwide shipping – Reduce downtime with quick order fulfillment and delivery to your location.

• Dedicated Caterpillar 3412E catalog – Our streamlined catalog ensures you get the correct part the first time.

• Expert technical support – Our team can assist in selecting the right rod assembly components for your specific engine build.