Exploring 5.9L Cummins engine Killer Dowel Pin failure. What it is, why it happens, how to fix or ... timing gear housing gasket, crank seal, and an all-important, teardrop-shaped steel ...

While both the 12 and some 24-valve Cummins 5.9L engines are known to suffer from the killer dowel pin issue, it's believed that the former models are more prone to experience the problem.