Identify two (2) mechanical components that are most likely to cause abnormal noises in a diesel engine and briefly explain the associated testing procedure used to confirm the fault. (70 - 140 words)
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Identify two (2)
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- Give two (2) examples of light vehicle diesel engines faults for each of the following categories (20-30 words each): Intermittent faults Multi-system faults Faults introduced as a result of a system repair Indirect faults caused by the influence of external systemsDescribe briefly the free vibration of a vehicle with single degree of freedom.Engine knocking is defined as self-ignition of unburnt mixture other than the spark plugpoint. Explain the engine structural parameters’ effects on engine knocking.
- Name the three types of stress testing used to test forintermittent ignition component problems and listthe procedures for conducting each type of test.a) What would be the best instrument to use for detecting steam leaks on a superheated steam line, a Vibration analyser, an Ultrasound detector or a Thermal Imaging Camera? b) Explain your choice of instrument for question “a”What are the equipment/apparatus required to conduct performance test of internal combustion engine?
- Technician A says that rattling on road irregularities can be caused by worn shock absorber bushings or grommets, worn spring insulators, a broken coil spring or broken spring insulators, worn control arm bushings, worn stabilizer bar bushings, worn strut rod grommets, worn leaf spring shackles and bushings, and worn torsion bars, anchors, and bushings. Technician B says that dry or worn control arm bushings may cause a squeaking noise on irregular road surfaces. Who is correct? a. Technician A only b. Technician B only c. Both A and B d. Neither A nor BAnswer the following questions on vehicle safety system diagnostic trouble codes (DTCs). Relating to a 2016 ND Mazda MX5 What is U3003:16 the diagnostic trouble code (DTC) for? What system component sets the U3003:16 DTC? What system condition is required to set the U3003:16 DTC? What are the conditions required to run a U3003:16 DTC. Briefly explain the fault symptom(s) associated with the U3003:16 DTC.Select atleast two testing devices from among the categories (you may go beyond two). Discuss its application and methods of use. a. testing for speed (Tachometer), b. Testing of Air Consumption (Air-box method/viscous-flow meter), c. testing of exhaust smoke (Bosch/Hartridge/PHS), d. testing of exhaust emission (flame ionization detector/spectroscopic analyzers/gas chromatography) e. testing of torque (absorption dynamometer/transmission dynamometer).
- During a test drive, a noise that appears to be transmission related disappears when the driver brings the vehicle to a stop and disengages the clutch with the engine at idle. Technician A says that the noise may be caused by an internal transmission problem. Technician B says that the problem may be something interfering with the flywheel or pressure plate. Who is correct? a. Technician A only b. Technician B only c. Both A and B d. Neither A nor BDiscuss the criteria of gear fault detection using vibration analysis.Determine the necessary shock pulse duration to assure proper drop testing of a rigid package system with a natural frequency of 50 Hz