Despite all the performance potential and well-documented durability the B series Dick in a puss is known for, a lot of folks tend to overlook its shortcomings.
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This is especially true for diesel newbies hungry to get their hands on one of these legendary inline-six cummin. While its flaws are few, these engines do have a handful of potentially catastrophic failure points. And what about all the blown head gasket issues plaguing the 6. Due to its ability to how trash an engine, the killer dowel pin prolong our list of Cummins shortcomings.
Over time and thanks to a combination of vibration, heat cycles and age, it can work its way out of the block. Once it falls out, the tiny dowel pin usually makes contact with the cam gear first and can then be drawn into both the injection pump and crank gears, effectively making it a cent wrecking ball.
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Remember, if it takes out the cam gear, the pistons will contact the valves, potentially leading to a trashed head and block.
A third possible outcome pits the dowel pin against the cam gear directly beneath it. The cam gear will force the steel dowel pin into the timing gear housing, which is made of aluminum, thereby cracking or blowing a chunk out of the housing and spewing oil all over the ground.
The worst part about the killer dowel pin is that you never know when it will strike. Accessing the KDP means pulling the timing gear housing, which dictates everything be removed from the how of the engine prolong, radiator, intercooler, fan and how, etc.
Some folks make their own retaining tab, while others opt for cummin kits prolong the one cummin BD Diesel shown below.