The Caterpillar 3126 is a turbocharged 7.2L inline 6-cylinder diesel engine manufactured by Caterpillar and first introduced in 1995; it was the first electronic mid-range diesel engine that Caterpillar produced.
[2] In 1998, Caterpillar released an improved version, the 3126B.
In 2002, the 3126E was released, though these improved versions only affected engine electronics, not the actual engine design.
[1] Caterpillar launched a three-tier system of overhaul kits for the 3126 and its C7 successor in 2011.
[3] It was rated for multiple power and torque applications from 170HP to 420HP and 420LB-FT(569NM) to 860LB-FT(1166NM).