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