Diagnose, adjust, repair, or overhaul trucks, buses, and all types of diesel engines. Includes mechanics working primarily with automobile diesel engines.

• Deep Submergence Vehicle Crewmember
• Diesel Mechanic
• Diesel-Mechanic Apprentice
• Machinist Apprentice, Marine Engine
• Machinist, Marine Engine
• Maintenance Mechanic
• Maintenance Mechanic, Engine
• Mechanic, Industrial Truck
• Oil-Field Equipment Mechanic
• Tractor Mechanic

• Adjust and reline brakes, align wheels, tighten bolts and screws, and reassemble equipment.
• Align front ends and suspension systems.
• Attach test instruments to equipment, and read dials and gauges to diagnose malfunctions.
• Disassemble and overhaul internal combustion engines, pumps, generators, transmissions, clutches, and differential units.
• Examine and adjust protective guards, loose bolts, and specified safety devices.
• Inspect and verify dimensions and clearances of parts to ensure conformance to factory specifications.
• Inspect brake systems, steering mechanisms, wheel bearings, and other important parts to ensure that they are in proper operating condition.
• Inspect, repair, and maintain automotive and mechanical equipment and machinery such as pumps and compressors.
• Inspect, test, and listen to defective equipment to diagnose malfunctions, using test instruments such as handheld computers, motor analyzers, chassis charts, and pressure gauges.
• Operate valve-grinding machines to grind and reset valves.
• Perform routine maintenance such as changing oil, checking batteries, and lubricating equipment and machinery.
• Raise trucks, buses, and heavy parts or equipment using hydraulic jacks or hoists.
• Rebuild gas or diesel engines.
• Recondition and replace parts, pistons, bearings, gears, and valves.
• Repair and adjust seats, doors, and windows, and install and repair accessories.
• Rewire ignition systems, lights, and instrument panels.
• Specialize in repairing and maintaining parts of the engine, such as fuel injection systems.
• Test drive trucks and buses to diagnose malfunctions or to ensure that they are working properly.
• Use handtools such as screwdrivers, pliers, wrenches, pressure gauges, and precision instruments, as well as power tools such as pneumatic wrenches, lathes, welding equipment, and jacks and hoists.

• adhere to safety procedures
• adjust or set mechanical controls or components
• align or adjust clearances of vehicle body parts or components
• align vehicle frame
• assemble, dismantle, or reassemble equipment or machinery
• conduct tests to locate mechanical system malfunction
• determine installation, service, or repair needed
• diagnose malfunctioning vehicle systems
• diagnose mechanical problems in machinery or equipment
• estimate time or cost for installation, repair, or construction projects
• examine vehicle to detect malfunctions, damage, or maintenance needed
• fabricate, assemble, or disassemble manufactured products by hand
• follow safe waste disposal procedures
• follow vehicle repair procedures
• identify base metals for welding
• inspect machinery or equipment to determine adjustments or repairs needed
• locate puncture in tubeless tires or inner tubes
• lubricate machinery, equipment, or parts
• maintain or repair cargo or passenger vehicle
• maintain repair records
• maintain welding machines or equipment
• move or fit heavy objects
• operate hoist, winch, or hydraulic boom
• operate lathes
• operate pneumatic test equipment
• operate vehicle engine electrical system test equipment
• overhaul vehicle major operating units, such as engines or transmissions
• perform safety inspections in industrial, manufacturing or repair setting
• read blueprints
• read schematics
• read technical drawings
• read vehicle manufacturer's specifications
• read work order, instructions, formulas, or processing charts
• repair commercial transportation equipment
• repair or install tires
• repair or replace electrical wiring, circuits, fixtures, or equipment
• repair or replace malfunctioning or worn mechanical components
• repair vehicle transmissions
• service vehicle with water, fuel, or oil
• set up and operate variety of machine tools
• solder vehicle components
• test mechanical products or equipment
• test operate vehicles before or after repair
• test vehicle computer processors to detect malfunctions
• understand service or repair manuals
• understand technical operating, service or repair manuals
• use acetylene welding/cutting torch
• use combination welding procedures
• use electrical or electronic test devices or equipment
• use electronic calibration devices
• use engine diagnostic equipment
• use hand or power tools
• use knowledge of metric system
• use knowledge of welding filler rod types
• use lifting equipment in vehicle repair setting
• use machine tools in installation, maintenance, or repair
• use oral or written communication techniques
• use pneumatic tools
• use precision measuring devices in mechanical repair work
• use soldering equipment
• use vehicle repair tools or safety equipment
• use voltmeter, ammeter, or ohmmeter
• weld together metal parts, components, or structures
• write vehicle damage repair estimates