Cummins ISX15/QSX15/X15 Torque Lock Injector Cup Kit

Permanent Solution to Fuel & Coolant Cross-Contamination

The Industrial Injection Torque Lock Injector Cup Kit is the proven solution for one of the most common failures on Cummins ISX15, QSX15, and X15 engines: leaking press-fit injector cups.

If you’re dealing with coolant in fuel on your Cummins ISX15, the root cause is often a loose factory press-fit injector cup. This kit provides a permanent fix by replacing the OEM sleeve with a threaded billet injector cup design.

Key Features & Benefits

• Direct Fit for Cummins ISX/QSX/X15 Engines
  • Fits 2010–2016 ISX15 & QSX15 Single Overhead Cam
  • Fits 2017–2026 Cummins X15
• Patented Billet Construction (Patent #11,519,371) – machined from premium materials in the USA.
• Thread-In Torque Lock Design – prevents cups from ever loosening, unlike factory press-fit style.
• Dual Oversized Silicone O-Rings – each twice the size of OEM seals, allowing proper expansion/contraction while maintaining a leak-free seal.
• Complete Installation Kit – includes taps, removal tools, nozzle bore plugs, o-rings, and torque lock tool for a professional installation.
• Made in the USA – engineered, manufactured, and tested to exceed OEM durability.

Why Choose Industrial Injection’s Torque Lock Kit?

• Eliminates fuel and coolant mixing issues permanently.
• Saves thousands in potential engine repairs and downtime.
• Designed for reliability in heavy-duty fleet, vocational, and on-highway applications.
• Trusted by professional diesel shops worldwide.

What’s Included

• Factory injector cup tap & centering sleeve
• Cylinder head tap
• Injector cup removal tool
• Torque lock cup installation tool
• 6 Torque Lock billet injector cups
• 6 nozzle bore plugs & 12 o-rings
• 12 injector cup o-rings

Installation Resources

Industrial Injection provides complete step-by-step installation instructions for this kit. If you’re not comfortable with injector cup removal and head tapping, we recommend professional installation at a qualified diesel machine shop.

⤵️ Download Installation Instructions »