4089618
Engine Piston Kit
Cummins®

The Engine Piston Kit (part number 4089618) is a set of components designed to form the reciprocating assembly of an internal combustion engine. The kit typically includes pistons, piston rings, wrist pins, and circlips. Pistons are the heart of the engine's power generation process, as they convert the heat generated by fuel combustion into mechanical energy that drives the crankshaft. Piston rings provide a seal between the piston and cylinder wall to contain combustion pressure and prevent oil from entering the combustion chamber. Wrist pins connect the piston to the connecting rod, allowing it to move up and down in response to combustion forces. Circlips secure wrist pins in place within their bores on either side of each piston. Overall, an engine piston kit is crucial for maintaining optimal performance and longevity of internal combustion engines in trucks and other vehicles.