5.9 & 3.9 Cummins Injector Adapter Sleeve 7mm to 9mm Set | 3919358 | 1989-1993 Dodge Cummins 5.9L / 3.9L

Cummins injector adapter sleeves, swapping from 7mm to 9mm in size, are essential components in diesel engines. These sleeves play a crucial role in optimizing fuel injection systems. Designed to precisely fit the injector nozzles, they ensure a secure and leak-free connection between the injector and the cylinder head. Upgrading or replacing these sleeves can significantly impact engine performance and fuel efficiency. Whether you're maintaining an existing engine or seeking performance enhancements, these adapter sleeves are vital in achieving optimal combustion, reducing emissions, and extending the life of your Cummins diesel engine. Their durability and precision engineering make them a reliable choice for diesel enthusiasts and professional mechanics alike. These carry a one year warranty.

These adapters must be used when installing injectors with the later 7 mm diameter nozzle in to earlier 12 valve cylinder heads with 9 mm nozzle holes. Used in New Holland, Case and Cummins.