Delphi HTK111 Injector Installation Kit for Caterpillar C7 Injectors

June 2015

It has come to our attention that there have been instances of injectors having external leaks after
installation on the engine. This is typically the result of either incorrect installation or reinstalling an injector
with its original “used” o-rings.

Whenever an injector is removed from an engine, the external o-ring seals must be replaced. If an o-ring is
reused, it may not seal correctly. Failure of an o-ring seal can result in poor engine performance and/or
premature engine failure.

You should also record the cylinder location of each injector during removal. If the injectors are not
reinstalled in their original location, the appropriate electronic service tool will need to be used to move the
corresponding trim files to the correct cylinder locations.

The installation procedure when using this kit must be completed as follows:

Be careful during installation of the o-rings and backing rings to prevent damage/distortion.

  1. Dip all o-rings and backing rings in engine oil.
  2. Install the upper (pink) backing ring in the top groove as shown.
  3. Install the upper large (purple) o-ring below the backing ring.
  4. Install the lower large (purple) o-ring in the center groove.
  5. Install the lower (white) backing ring in the center groove below the o-ring as shown.
  6. Install the smaller (blue) o-ring in the lower groove.

Be careful not to damage the injector or introduce any contamination during handling and installation. Also, always prime the fuel system and oil galleries before starting the engine.

Important Note: The above information is a general installation guide. Always follow the latest engine manufacturers’ service information.


Jimmy Finch

Dallas Branch Manager, M&D Distributors

Jimmy Finch has over 33 years of experience in Diesel Engine Sales, Service and Repair. His experience started early in life at Texas Fuel Injection Service (an early acquisition of M&D) as a job with a means to an end. Somewhere in that 33 years this job turned into a fulfilling career. He started in the injector clean up department and has held practically every position leading up to his current role as Branch Manager of the Dallas, Texas location.

In his spare time, Jimmy enjoys spending time with his wife of 24 years, Priscilla. They are currently getting ready to make their way into the empty-nesters stage of life. He also enjoys the occasional hunting trip with friends and family and chasing down potential customers by the names off their trucks.

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