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Exhaust valves

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001182
EISBN: 978-1-62708-218-1
... Abstract A broken exhaust valve from the cylinder of a motor car had a 30-mm disk diam and 8-mm stem diam. The site of the fracture was directly where the valve cone joined the cylindrical stem. Both the cone and the stem were heavily scaled in the vicinity of the fracture; in some parts...
Image
Published: 01 January 2002
Fig. 51 Failed AISI H26 exhaust-valve punch. (a) and (b) Longitudinal splitting of the punch caused by fatigue. Note the fracture progression starting from the top center at the punch. The punch surfaces were nitrided. (c) Top surface. 100× . (d) Extreme top surface. Note secondary crack More
Image
Published: 01 June 2019
Fig. 2 The crack (arrow) extended at the exhaust valve seat counterbore where the failure originated ( Fig. 1 ). More
Image
Published: 30 August 2021
Fig. 51 Failed AISI H26 exhaust-valve punch. (a) and (b) Longitudinal splitting of the punch caused by fatigue. Note the fracture progression starting from the top center at the punch. The punch surfaces were nitrided. (c) Top surface. Original magnification: 100×. (d) Extreme top surface More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0092131
EISBN: 978-1-62708-234-1
... Abstract The engine of an automobile lost power and compression and emitted an uneven exhaust sound after several thousand miles of operation. When the engine was dismantled, it was found that the outer spring on one of the exhaust valves was too short to function properly. The short steel...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0046981
EISBN: 978-1-62708-218-1
... Abstract The exhaust valve of a truck engine failed after 488 h of a 1000 h laboratory endurance test. The valve was made of 21-2 valve steel in the solution treated and aged condition and was faced with Stellite 12 alloy. The failure occurred by fracture of the underhead portion of the valve...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001743
EISBN: 978-1-62708-217-4
... Abstract Cylinder fatigue can result from abnormal heating in service. Fatigue can be experienced also by piston heads, exhaust valves, and turbosupercharger housings (castings). Pistons from different engines series can sometimes fit, but because of slight design modifications, they may...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006793
EISBN: 978-1-62708-295-2
... and safety, reliability, and quality can be greatly reduced. Excessive wear from inlet and exhaust valves impacting their seating faces in automotive engines can lead to loss of cylinder pressure and ultimately engine failure. Failure of tools used for drilling rock and other media raises cost concerns...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003573
EISBN: 978-1-62708-180-1
... information being available to the designer. In such instances, the designer has to make assumptions concerning the conditions of service. Example 2: Distortion Failure of an Automotive Valve Spring The engine of an automobile lost power and compression and emitted an uneven exhaust sound after several...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006797
EISBN: 978-1-62708-295-2
... an uneven exhaust sound after several thousand miles of operation. When the engine was dismantled, it was found that the outer spring on one of the exhaust valves was too short to function properly. The short steel spring and an outer spring taken from another cylinder in the same engine (both shown in Fig...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001832
EISBN: 978-1-62708-241-9
... with a purge ventilation system designed to continuously remove hydrogen gas and vapors without letting radionuclides escape. Several intergranular cracks were discovered in the vent pipe of one such system. The pipe, made of galvanized steel sheet, connects to an exhaust fan downstream of high-efficiency...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003565
EISBN: 978-1-62708-180-1
... for reduced oil consumption and exhaust emissions has led to a reduction in the amount of lubricant present in the air stream in automotive engines. This, combined with the effort to lengthen service intervals and increase engine performance, has led to an increase in the wear of inlet valves and seat inserts...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003512
EISBN: 978-1-62708-180-1
... to exhaustion of life, thus leading to failure. Damage may be defined as a “progressive and cumulative change acting to degrade the structural performance of the load-bearing component or components which make up the plant” ( Ref 2 ). Life may be defined as the “period during which a component can perform its...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001473
EISBN: 978-1-62708-229-7
... authority supply. Installation The set comprised a back-pressure turbine of 3,000 kW capacity, running at 10,000 r.p.m. and coupled through the gearbox to an alternator running at 1,500 r.p.m. The turbine exhausted into the works' steam main and the alternator normally carried the whole...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006802
EISBN: 978-1-62708-329-4
... be considered for repair, refurbishment, or replacement. For any component in a facility, the failure criteria should be clearly defined and established. Failure does not always involve fracture or rupture. Progressive damage of structures and components under daily operating conditions leads to exhaustion...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001813
EISBN: 978-1-62708-180-1
... most spring applications involve operating temperatures that are not far above or below room temperature, many applications require springs to operate over an appreciable temperature range. For instance, valve springs in internal-combustion engines must operate in frigid weather for start-up...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006836
EISBN: 978-1-62708-329-4
... to exhaust gases. After approximately 80,000 km (50,000 mi) of service, broken springs were found in two engines. The trucks were used on public highways and were exposed to a variety of terrains and operating conditions, but conditions could not be characterized as extraordinary service. The springs were...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006914
EISBN: 978-1-62708-395-9
... of the flame is monitored as it travels downward ( Fig. 3 ). Fig. 3 Apparatus used in ASTM E162. 1, temperature sensor; 2, exhaust stack; 3, igniter; 4, test specimen; 5, radiant panel. Source: Ref 14 ASTM D635, “Standard Test Method for Rate of Burning and/or Extent and Time of Burning...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003502
EISBN: 978-1-62708-180-1
... steel valve head with a 5 mm threaded stem had come loose. The valve head hangs down from a piston, and when the threaded connection came loose it progressively unscrewed to the point that the valve head blocked an air exhaust port, thus causing the brakes to remain partially applied. Without knowing...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006785
EISBN: 978-1-62708-295-2
... and industries that have experienced SCC failures include (this list is not exhaustive): Aerospace: Aluminum alloys in structural aircraft components such as landing gear and wing components, stainless steel tubing used as part of the hydraulic or fuel systems, high-strength low-alloy steel...