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Getting your Cummins 855 valve adjustment right is one of those maintenance tasks that separates a smooth-running rig from a noisy, fuel-chugging headache. If you've spent any time around these old-school workhorses, you know they are basically the backbone of the trucking and construction world. Whether it's an old Big Cam or an NT855, these engines are built to last, but they aren't "set it and forget it" machines. They need a little love under the valve cover every now and then to keep them humming. ...