Cummins ISX15 / QSX15 / X15 Torque Lock Injector Cup Kit
SKU: C45602
Product Description:
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 2017–2021 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 »
Why does my Cummins ISX15 have fuel in the coolant?
Fuel in coolant is usually caused by injector cup failure. The factory press-fit design loosens over time, allowing cross-contamination.
How do I fix a leaking injector cup on an ISX?
The best solution is a threaded injector cup kit like Industrial Injection’s Torque Lock design, which permanently seals the bore and prevents leaks.
Does this kit fit the X15?
Yes, this kit covers 2010–2016 ISX15 & QSX15 SOHC engines, as well as 2017–2021 Cummins X15.
Read Carefully!
When you purchase a product from our website that has a core requirement, you have two options:
1. You choose to pay the core charge and we will ship the product right away, then once we receive the cores you will be refunded the core charge if your cores pass our inspection qualifications. This is the preferred choice and has the least delays.
2. You choose to send in your cores before we ship the product that was purchased. This choice has the risk of delayed shipment of your purchased product and our inventory is not guaranteed by the time we receive your cores. You will need to follow all of the instructions below as quickly as possible so that you can get your purchased product and we can receive the cores. When you choose this option you acknowledge that by the time we receive your cores, our inventory could have change and there could be a delay in your shipment.
Please return all cores to:
Industrial Injection Core Returns
2858 South 300 West
Salt Lake City, Utah 84115
INCLUDE RA# THAT WAS ISSUED AT TIME OF PURCHASE! If RA # is lost, please call Customer Service at (800) 955-0476. Have your original invoice at time of phone call to give all appropriate information for return.
Core return freight is the responsibility of the customer
FULL CREDIT WILL BE GIVEN WHEN:
In order to receive full core credit, your core(s) must be returned within 90 days from receipt of order. It must be as is “off the engine.” Full core credit will be given if core meets acceptance criteria. Cores that are damaged during shipment to Industrial Injection are the responsibility of the customer and their shipping company.
½ CORE CHARGE CREDIT WILL BE GIVEN WHEN:
- Slightly damaged housing or camshaft
- Missing parts such as FCA
No Core Credit issued when:
- Core is seized or hydraulic head is cracked
- Excessive damage ( Heavy use of Bio-diesel and rust are common causes for unacceptable core)
- Core is fire damaged
- Core is returned after 90 days/3months
Please do the following when returning a core:
- Make sure you have removed all fittings from your old unit
- Drain all fuel and oil from unit
- Package cores so that fuel and oil does not escape from the package
NOTE: packages that have fuel or oil residue on the outside of the box during shipping will not be delivered by UPS or the postal service which will cause delays.
- Please re-use boxes and bags that parts were shipped in originally. These boxes are UPS approved to reduce damage while being handled in freight.
- All shipping charges are the responsibility of the customer
- Please write on the box “Core Return” and have RA # clearly written on the outside of box
- Include copy of original invoice and RGA inside box
PLEASE RETAIN RA#, INVOICE # AND TRACKING NUMBER UNTIL CREDIT IS RECEIVED BY YOU. We do not research by customer name, only invoice # or RA #.
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