The Cummins 5.9L "B-Series" diesel engine was produced from 1984 up until 2007. First generation versions were named the 6BT but also commonly referred to as the 12v, or 12-valve. Each cylinder had 2 valves, hence the name 12-valve. Midway through 1998, the 6BT was replaced with the ISB, which stands for "Interact System B".
The 7.3L Power Stroke turbo diesel was introduced halfway through the 1994 model year in Ford Econoline vans and Ford Heavy Duty pickups. It effectively replaced the 7.3 IDI turbo with which it shared nothing other than displacement size.
The legendary 7.3 Power Stoke Diesel engine, when properly maintained can provide years of trouble free service. However there are several common problems that can develop over time. Generally speaking these can all be resolved relatively easily. Learn 9 common problems of the 7.3 Liter Power Stroke Diesel engine, and how you can fix them.