![]() Not only does this mean game-over for the engine, but it results in a truck that’s down for weeks (if not months) and a huge chunk of change missing from your wallet. Perhaps the most devastating of all Duramax failures is a broken factory crankshaft. ![]() For example, did you know the injection pump on the LML version is prone to coming apart and wrecking the entire high-pressure fuel system when it does? Or how about the fact that the rods in the LB7 and LLY engines can bend with added power and the LBZ and LMM mills are notorious for cracking pistons? Discover the worst failure point(s) of your Duramax in the article that follows, along with how to address it. Still, and just as we exposed the shortcomings of the almighty Cummins, the Duramax isn’t without its flaws-some of them catastrophic. In stock form and even when substantially modified, GM’s legendary V8 diesel can provide hundreds of thousands of miles of trouble-free use. It’s been said before, but that doesn’t make it any less true: The 6.6L Duramax is one heck of an engine. 5 Fatal Flaws of the Duramax-and How to Fix Them
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