FILTER-AIR 4176401 - Caterpillar

Fuel Injectors
The 6V-4022 Fuel Injector Tester was cancelled and replaced by components that were also cancelled or discontinued.
The 1U-6661 Pop Tester Gp was discontinued.The testers were rendered obsolete by increased injection pressures and by performance requirements for injectors. The inaccuracy of the testers' use with improved injectors resulted in replacement of good injectors. This caused warranty claims for injectors with no fault.The service literature that was related to the testers has been removed from the Service Information System (SIS) and from Media Logistics. References to the testers and to the removed service literature have also been removed or the references are in the process of being removed.The Marketing and Product Support Division will no longer accept any warranty claims on any injectors that are evaluated by the above testers or by any other commercial device that is used for the testing of injectors.Fuel Nozzles
The 5P-4150 Nozzle Testing Group is used for the bench testing of fuel nozzles only after the nozzles have been tested in the engine and the performance of the nozzles are questionable.The 5P-4150 Nozzle Testing Group is still serviceable.Do not use the 5P-4150 Nozzle Testing Group with fuel injectors.The Marketing and Product Support Division will no longer accept any warranty claims on any nozzles that are evaluated prior to being tested by engine operation.