Journal of Failure Analysis and Prevention

, Volume 13, Issue 4, pp 502–509 | Cite as

Failure Analysis of Cap Screws in a Diesel Engine Front Gear Train

  • E. W. Jones
  • R. S. Florea
  • D. K. Francis
Technical Article---Peer-Reviewed


Two failures of the front gear train cap screws of a diesel engine in a marine vessel are investigated. Fractured cap screws were present in both failures. The cap screws’ strength was compared to standards. The thread engagement was also analyzed. In one failure, the cap screws used did not comply with the standard properties and in the other failure, improper thread engagement resulted in fast fracture after few load cycles.


Critical components Failure analysis Fasteners Fracture Mounting bolt Hardness 


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Copyright information

© ASM International 2013

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringMississippi State UniversityMississippi StateUSA
  2. 2.Mechanical Engineering Department, David Crawford School of EngineeringNorwich UniversityNorthfieldUSA
  3. 3.Center for Advanced Vehicular SystemsMississippi State UniversityMississippi StateUSA

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