Practical Failure Analysis

, Volume 1, Issue 4, pp 51–55 | Cite as

Failure analysis of cylinder clamping rods in diesel engines

  • B. V. Krishna
  • A. Verma
  • John F. Welch
Peer Reviewed Articles

Abstract

This article discusses the failure of cylinder clamping rods in single cylinder diesel engines. The AISI 4140 hardened and tempered steel clamping rods were failing after 200–250 h of operation. The fatigue failures initiated at the root of the last thread on the clamping rod that was engaged in a blind hole in the cylinder block. The failures were caused by loose tolerances on the threads that resulted in a non-uniform distribution of load. The load was concentrated on the last threads to engage, thus causing fatigue crack nucleation at the thread root and propagation until the rod broke by overload. Changing the tolerance on the threads virtually eliminated the fatigue problem.

Keywords

failure analysis fatigue tolerance threaded fasteners diesel engines 

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References

  1. 1.
    IS 4218 (Part 4)[is this part 4 of the book’s part 4?],ISO metric screw threads: Part 4 — Tolerancing System, (2nd ed.), International Organization for Standardization, Geneva, Switzerland, 1976.Google Scholar
  2. 2.
    A. Blake,What Every Engineer Should Know About Threaded Fasteners, Materials and Design, Marcel Dekker, Inc., New York, 1986, pp. 141–146.Google Scholar

Copyright information

© ASM International - The Materials Information Society 2001

Authors and Affiliations

  • B. V. Krishna
    • 1
  • A. Verma
    • 2
  • John F. Welch
    • 2
  1. 1.Materials Science & Technology DivisionThapar Center for Industrial Research and DevelopmentPatialaIndia
  2. 2.Technology CenterBangaloreIndia

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