News, views & analysis blogs by: Del Williams


Del Williams :
Conquering an Age-Old Issue to Prevent Engine Failure


Del Williams :
To handle the vibration, joint fatigue, and temperature extremes that exhaust manifold nuts are subjected to, Cummins specifies an innovative locking fastener for enhanced industrial engine reliability in the field

Keeping exhaust manifold joints secure to keep engines running has been an age-old issue for engineers due to the severe vibration, joint fatigue and temperature extremes present. When turbo mounting nuts vibrate loose and fall off, this can lead to engine failure and unscheduled downtime that can upset production schedules and delivery commitments.

To keep its industrial engine customers productively on the job, Columbus, IN, USA-based Cummins Inc., a global power leader of complimentary business units that design, manufacture, distribute and service engines and related technologies, sought the ideal solution to secure exhaust manifold joints when developing its Off-Highway Tier 3 QSX engine.

“Our industrial customers rely on our engines to get the job done, often for decades, so our engines must be up to the task,” says Dale Gibby, a Cummins mechanical development engineer at the company’s Columbus Technical Center in Columbus, IN. “Our goal was to design the QSX engine for rock-solid, real-world reliability in industrial applications ranging from farm tractors, road graders, and rock crushers to generators, air compressors, and drill and concrete pumpers.”

To assure engine reliability in the field, Gibby was tasked to keep the QSX engine’s exhaust manifold joints secure despite the severe vibration, joint fatigue and tempera

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