PDI Big Boss Monotherm Inframe Overhaul Kit for CAT 3406E & C15

Built For Serious Rebuilds. Trusted For Real-World Work.

The PDI Big Boss In-Frame Overhaul Kit for CAT 3406E & C15 features laser-hardened top ring grooves for extended piston life, DLC-coated piston pins, and DLC-coated top piston rings—engineered for reduced friction, superior wear resistance, and long-term reliability.

Our Monotherm Pistons replace traditional 2-piece piston designs with a single-piece forged steel monotherm piston—delivering superior strength, improved thermal control, and long-term durability in high-load applications.

Built for high-hour, high-load applications, this kit is trusted by engine builders, fleets, and owner-operators who demand durability beyond standard replacement parts.

Why Builders Choose Big Boss

• Complete in-frame solution for CAT 3406E & C15 engines
• Laser-hardened top ring grooves for increased piston durability
• DLC-coated piston pins and top piston rings for reduced friction and wear
• Precision-engineered components for consistent compression
• Built for heavy-duty, high-mileage diesel applications
• Backed by PDI’s 1-Year Unlimited Mile Warranty

What’s Included In The Kit

This PDI Big Boss In-Frame Overhaul Kit includes the critical components required for a professional in-frame rebuild:

• (6) Cylinder Kits (pistons, liners, and rings)
• (6) Rod Bearing Sets
• (6) Piston Oilers
• (1) Main Bearing Set
• (1) Upper Gasket Set
• (1) Oil Pan Gasket

Designed for Real-World Performance

Every component in this kit is engineered to meet the demands of real-world heavy-duty use—long hours, sustained loads, and high operating temperatures. Big Boss overhaul kits are built to go beyond standard rebuild expectations, helping extend engine life and protect your investment.

Fitment & Compatibility

Fits:
• Caterpillar 3406E
• Caterpillar C15

Why PDI?

PDI designs and manufactures heavy-duty diesel engine components trusted by professionals across the industry. From overhaul kits, cylinder heads, injectors and supporting components, every product is built with a focus on strength, precision, and long-term reliability.