# Bus and Truck Mechanics and Diesel Engine Specialists > Diagnose, adjust, repair, or overhaul buses and trucks, or maintain and repair any type of diesel engines. Includes mechanics working primarily with automobile or marine diesel engines. - Code: 49-3031.00 (O*NET-SOC; SOC 2018 49-3031) - Family: [Installation, Maintenance & Repair](https://foundation.org.ai/occupations#family-49), one of its 52 occupations - Tasks: 26 tasks (23 core and 3 supplemental) - Page: https://foundation.org.ai/occupations/49-3031.00 - JSON: https://foundation.org.ai/data/tasks/49-3031.00.json ## What the work is made of 1. Use handtools, such as screwdrivers, pliers, wrenches, pressure gauges, or precision instruments, as well as power tools, such as pneumatic wrenches, lathes, welding equipment, or jacks and hoists. Core task · Task 2981 · Rated by 81 people who do the job, August 2022 2. Inspect brake systems, steering mechanisms, wheel bearings, and other important parts to ensure that they are in proper operating condition. Core task · Task 2982 · Rated by 80 people who do the job, August 2022 3. Raise trucks, buses, and heavy parts or equipment using hydraulic jacks or hoists. Core task · Task 2985 · Rated by 81 people who do the job, August 2022 4. Adjust and reline brakes, align wheels, tighten bolts and screws, and reassemble equipment. Core task · Task 2984 · Rated by 81 people who do the job, August 2022 5. Attach test instruments to equipment, and read dials and gauges to diagnose malfunctions. Core task · Task 2991 · Rated by 80 people who do the job, August 2022 6. Perform routine maintenance such as changing oil, checking batteries, and lubricating equipment and machinery. Core task · Task 2983 · Rated by 82 people who do the job, August 2022 7. Examine and adjust protective guards, loose bolts, and specified safety devices. Core task · Task 2988 · Rated by 81 people who do the job, August 2022 8. Inspect, test, and listen to defective equipment to diagnose malfunctions, using test instruments such as handheld computers, motor analyzers, chassis charts, or pressure gauges. Core task · Task 2987 · Rated by 80 people who do the job, August 2022 9. Rewire ignition systems, lights, and instrument panels. Core task · Task 2992 · Rated by 82 people who do the job, August 2022 10. Test drive trucks and buses to diagnose malfunctions or to ensure that they are working properly. Core task · Task 2986 · Rated by 82 people who do the job, August 2022 11. Diagnose and repair vehicle heating and cooling systems. Core task · Task 18582 · Rated by 80 people who do the job, August 2022 12. Inspect, repair, and maintain automotive and mechanical equipment and machinery, such as pumps and compressors. Core task · Task 2995 · Rated by 80 people who do the job, August 2022 13. Inspect and verify dimensions and clearances of parts to ensure conformance to factory specifications. Core task · Task 2989 · Rated by 78 people who do the job, August 2022 14. Disassemble and overhaul internal combustion engines, pumps, generators, transmissions, clutches, and differential units. Core task · Task 2996 · Rated by 79 people who do the job, August 2022 15. Adjust or repair computer controlled exhaust emissions devices. Core task · Task 19886 · Rated by 80 people who do the job, August 2022 16. Rebuild gas or diesel engines. Core task · Task 2997 · Rated by 79 people who do the job, August 2022 17. Specialize in repairing and maintaining parts of the engine, such as fuel injection systems. Core task · Task 2990 · Rated by 80 people who do the job, August 2022 18. Recondition and replace parts, pistons, bearings, gears, and valves. Core task · Task 2993 · Rated by 81 people who do the job, August 2022 19. Install or repair accessories. Core task · Task 20453 · Rated by 80 people who do the job, August 2022 20. Repair or adjust seats, doors, or windows. Core task · Task 20454 · Rated by 81 people who do the job, August 2022 21. Dismount, mount, and repair or replace tires. Core task · Task 23955 · Rated by 81 people who do the job, August 2022 22. Align front ends and suspension systems. Core task · Task 2998 · Rated by 81 people who do the job, August 2022 23. Maintain or repair vehicles with alternative fuel systems, including biodiesel, hybrid, or compressed natural gas vehicles. Core task · Task 19888 · Rated by 81 people who do the job, August 2022 24. Measure vehicle emissions to determine whether they are within acceptable limits. Supplemental task · Task 19889 · Rated by 79 people who do the job, August 2022 25. Follow green operational practices involving conservation of water or energy or reduction of solid waste. Supplemental task · Task 19887 · Rated by 79 people who do the job, August 2022 26. Operate valve-grinding machines to grind and reset valves. Supplemental task · Task 2999 · Rated by 79 people who do the job, August 2022 ## More in Installation, Maintenance & Repair - [Aircraft Mechanics and Service Technicians](https://foundation.org.ai/occupations/49-3011.00): 38 tasks - [Audiovisual Equipment Installers and Repairers](https://foundation.org.ai/occupations/49-2097.00): 11 tasks - [Automotive Body and Related Repairers](https://foundation.org.ai/occupations/49-3021.00): 25 tasks - [Automotive Glass Installers and Repairers](https://foundation.org.ai/occupations/49-3022.00): 18 tasks - [Automotive Service Technicians and Mechanics](https://foundation.org.ai/occupations/49-3023.00): 30 tasks - [Avionics Technicians](https://foundation.org.ai/occupations/49-2091.00): 13 tasks - [Bicycle Repairers](https://foundation.org.ai/occupations/49-3091.00): 14 tasks - [Camera and Photographic Equipment Repairers](https://foundation.org.ai/occupations/49-9061.00): 15 tasks - [Coin, Vending, and Amusement Machine Servicers and Repairers](https://foundation.org.ai/occupations/49-9091.00): 18 tasks - 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[Maintenance Workers, Machinery](https://foundation.org.ai/occupations/49-9043.00): 18 tasks - [Manufactured Building and Mobile Home Installers](https://foundation.org.ai/occupations/49-9095.00): 14 tasks - [Mechanical Door Repairers](https://foundation.org.ai/occupations/49-9011.00): 25 tasks - [Medical Equipment Repairers](https://foundation.org.ai/occupations/49-9062.00): 20 tasks - [Millwrights](https://foundation.org.ai/occupations/49-9044.00): 23 tasks - [Mobile Heavy Equipment Mechanics, Except Engines](https://foundation.org.ai/occupations/49-3042.00): 20 tasks - [Motorboat Mechanics and Service Technicians](https://foundation.org.ai/occupations/49-3051.00): 13 tasks - [Motorcycle Mechanics](https://foundation.org.ai/occupations/49-3052.00): 13 tasks - [Musical Instrument Repairers and Tuners](https://foundation.org.ai/occupations/49-9063.00): 29 tasks - [Outdoor Power Equipment and Other Small Engine Mechanics](https://foundation.org.ai/occupations/49-3053.00): 14 tasks - [Precision Instrument and Equipment Repairers, All Other](https://foundation.org.ai/occupations/49-9069.00): no tasks listed - 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[Watch and Clock Repairers](https://foundation.org.ai/occupations/49-9064.00): 15 tasks - [Wind Turbine Service Technicians](https://foundation.org.ai/occupations/49-9081.00): 12 tasks ## Where this comes from Quoted from O*NET 29.0, U.S. Department of Labor, Employment and Training Administration, under CC BY 4.0: free to copy and reuse, with credit. 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