Abstract: The present disclosure is related to detection of a failed NOx sensor, which is crucial for modern combustion engine aftertreatment control, but its failure can cause false diagnostics, reduced engine performance, and lengthy troubleshooting. Accordingly, a system and method for detecting a NOx sensor in an engine through a NOx functional test is disclosed with a selective catalytic reduction SCR system, an ammonia source, a regeneration device, a NOx sensor positioned at an output stream of the SCR system, and an electronic control module in communication with the ammonia source and the NOx sensor. Furthermore, the electronic control module is configured to receive one or more signals from the NOx sensor.

Abstract: A plurality of injector hold-down clamps (310) is arranged to connect, one each, each of a plurality of fuel injectors (106) to an internal combustion engine (100). Each fuel injector forms a neck region (212), and each clamp surrounds each injector around the neck region, such that a plurality of annular volumes (604) is defined, one each, between the neck region of each injector and each injector clamp. Each annular volume collects a quantity of lubrication oil during operation of the internal combustion engine such that the volume of oil collected in each respective annular volume removes heat from the respective fuel injector.

Abstract: A plurality of injector hold-down clamps (310) is arranged to connect, one each, each of a plurality of fuel injectors (106) to an internal combustion engine (100). Each fuel injector forms a neck region (212), and each clamp surrounds each injector around the neck region, such that a plurality of annular volumes (604) is defined, one each, between the neck region of each injector and each injector clamp. Each annular volume collects a quantity of lubrication oil during operation of the internal combustion engine such that the volume of oil collected in each respective annular volume removes heat from the respective fuel injector.