![]() The ISB 5.9 featured an inline-6 cylinder engine with multi-valve pushrods, and 4 valves per cylinder. Here is our article on Cummins 5.9 12v engine problems. ![]() ![]() Midway through 1998, the 6BT was replaced with the ISB, which stands for “Interact System B”. Each cylinder had 2 valves, hence the name 12-valve. First generation versions were named the 6BT but also commonly referred to as the 12v, or 12-valve. The Cummins 5.9L “B-Series” diesel engine was produced from 1984 up until 2007.
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