Cummins ISX15 / QSX15 / X15 Torque Lock Injector Cup Kit - Torque Lock Injector Cup and Oring Only (Set of 6) - Industrial Injection - C45603

Cummins ISX15/QSX15/X15 Torque Lock Injector Cup Kit
Permanent Solution to Fuel and 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 and Benefits
Direct Fit for Cummins ISX/QSX/X15 Engines
Fits 2010-2016 ISX15 and 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 and centering sleeve
Cylinder head tap
Injector cup removal tool
Torque lock cup installation tool
6 Torque Lock billet injector cups
6 nozzle bore plugs and 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 »