Image is for illustration purposes only. Actual part may vary.

321318

INJECTOR SLEEVE O-RING KIT CAT

This PAI 321318 kit contains the o-rings needed to seal the fuel injector sleeves on Caterpillar 3406E, C15, C16, and C18 diesel engines. The injector sleeve sits inside the cylinder head and separates the fuel and coolant passages from the combustion chamber; a failed o-ring can allow fuel and coolant to mix, leading to engine damage. The kit is commonly replaced during injector service or cylinder head overhaul to maintain a leak-free seal. It includes three different o-ring sizes that match the original Caterpillar components.