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Rocker levers

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0089651
EISBN: 978-1-62708-235-8
... Abstract Several diesel-engine rocker levers (malleable iron similar to ASTM A 602, grade M7002) failed at low hours in overspeed, over-fuel, highly loaded developmental engine tests. Identical rocker levers had performed acceptably in normal engine tests. The rocker levers were failing through...
Published: 01 June 2019
Fig. 1 Failed malleable iron rocker lever. (a) Illustration showing failure location (arrow). (b) Typical appearance of fracture face with dark overload fracture at top, light-gray fatigue fracture, and black casting defect (arrow). 1.5x More
Published: 01 June 2019
Fig. 2 Section through a spiking defect in rocker lever similar to that shown in Fig. 45. (a) 30x. (b) 60x More
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003508
EISBN: 978-1-62708-180-1
... was submitted for failure analysis to determine the cause of cracking. Investigation The cylinder head was magnetic-particle inspected by both the head and coil methods. No indications were present on the cylinder head, except those shown in Fig. 1 and 2 . The head was cracked on the rocker-arm pan...