X15 Rebuild Kit – Fully CNC with Upgraded Thrust Bearings

This X15 rebuild kit (X15-RBL-KIT-FLL) is new, built to OEM specifications and backed by PT Turbo’s 12-month unlimited-mile warranty.

Restore the performance and reliability of your Cummins X15 turbocharger with this precision-engineered X15 Turbo Rebuild Kit.

This complete kit is built around fully CNC-machined components for maximum accuracy and durability. It includes an upgraded 360-degree thrust bearing — a major enhancement over standard 270-degree designs — providing full-circle lubrication for greater thrust capacity under high boost. Whether you’re addressing standard wear or building for performance, this kit delivers lasting results without the need for a full turbo replacement.

Kit Contents:

• 3 Back Plate Bolts
• 1 Thrust Bearing (360-degree upgrade)
• 1 Thrust Collar
• 1 Thrust Spacer
• 2 Compressor Side Piston Ring Seals
• 2 Turbine Side Piston Ring Seals
• 2 Journal Bearings with 4 Retainer Snap Rings
• 1 Compressor Housing O-Ring
• 1 Bearing Housing O-Ring
• 1 Shaft Nut
• 2 Turbo Clamp Nuts
• 3 Oil Seals for VGT & Crossshaft Applications

Key Features:

• Fully CNC-Machined Parts: Precision fit and consistent tolerances for optimal turbocharger balance and longevity.
• Upgraded 360° Thrust Bearing: Improves thrust capacity and reliability, especially under high-performance conditions.
• OEM-Level Quality: Designed to meet or exceed original manufacturer standards for fit, function, and durability.
• Complete & Reusable: Allows reuse of your center, compressor, and turbine housings — no full turbo replacement required.

Whether you’re performing preventative maintenance or rebuilding for performance, this X15 kit offers a cost-effective and high-performance solution for restoring turbo function and efficiency.

Note: Gasket/seal color may vary from photographs
California buyers: Sales tax applies

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About This Cummins X15 Turbo Rebuild Kit

The Cummins X15 — successor to the ISX15 — powers the majority of Class 8 semi-trucks, long-haul freight vehicles, and heavy vocational equipment in North America. Rated at up to 605 horsepower and 2,050 lb-ft of torque, the X15 demands a turbocharger that handles extreme heat, sustained high boost, and continuous operation. When variable geometry vanes stick, thrust bearings fail, or shaft play develops, performance suffers immediately — reduced boost, elevated EGTs, and eventually a derate or limp mode.

This rebuild kit provides every rotating and sealing component needed to return your X15 turbocharger to factory spec without the cost of a core exchange or new unit.

Kit Contents

• Fully CNC-machined journal bearings — precision ground to OEM tolerances
• Upgraded thrust bearing assembly — the most common failure point on high-mileage X15 turbos
• Compressor-side and turbine-side piston rings and O-rings
• Snap rings, retaining clips, and all required hardware

Why CNC Machined Bearings Matter

Standard aftermarket kits often use cast or broached bearing surfaces that wear unevenly under load. Every component in this kit is CNC-machined to tight tolerances, ensuring proper oil film thickness across the bearing journal — the most critical factor in turbocharger longevity. The upgraded thrust bearing is hardened to handle the axial loads generated by variable geometry actuation that stock packages cannot sustain long-term.

Rebuild vs. Replace

A remanufactured or new X15 turbocharger typically costs $2,500–$4,500 depending on configuration. Rebuilding your existing core with a professional-grade kit cuts that cost significantly and keeps a serviceable housing in service. PT Turbo has been rebuilding turbochargers since 1978 in San Bernardino, California. If you would prefer to ship your X15 core to us for a complete rebuild with balancing and warranty, contact us for a quote.

Deciding between rebuilding your existing core and buying a remanufactured exchange unit? Our guide to OEM vs remanufactured turbochargers breaks down the cost and quality differences.