HDD 112 - Heavy Duty Diesel Engines Level I

1. Complete NATEF tasks related to General Heavy Duty Diesel Engine as listed below.
   1. Inspect fuel, oil, Diesel Exhaust Fluid (DEF) and coolant levels, and condition; determine needed action.
   2. Identify engine fuel, oil, coolant, air, and other leaks; determine needed action.
   3. Listen for engine noises; determine needed action.
   4. Observe engine exhaust smoke color and quantity; determine needed action.
   5. Identify engine vibration problems.
   6. Check and record electronic diagnostic codes.
2. Complete NATEF tasks related to Heavy Duty Diesel Engine Block as listed below.
   1. Inspect crankshaft vibration damper; determine needed action.
   2. Inspect flywheel/flexplate (including ring gear) and mounting surfaces for cracks and wear; measure runout; determine needed action.
3. Complete NATEF tasks related to Heavy Duty Diesel Engine Lubrication Systems as listed below.
   1. Test engine oil pressure and check operation of pressure sensor, gauge, and/or sending unit; test engine oil temperature and check operation of temperature sensor; determine needed action.
   2. Check engine oil level, condition, and consumption; determine needed action.
   3. Inspect, clean, and test oil cooler and components; determine needed action.
   4. Inspect turbocharger lubrication systems; determine needed action.
   5. Determine proper lubricant and perform oil and filter change.
4. Complete NATEF tasks related to Heavy Duty Diesel Engine Cooling System as listed below.
   1. Check engine coolant type, level, condition, and consumption; test coolant for freeze protection and additive package concentration; determine needed action.
   2. Inspect coolant conditioner/filter assembly for leaks; inspect valves, lines, and fittings; replace as needed.
   3. Inspect, clean, and pressure test radiator. Pressure test cap, tank(s), and recovery systems; determine needed action.
   4. Inspect thermostatic cooling fan system (hydraulic, pneumatic, and electronic) and fan shroud; replace as needed.
   5. Inspect turbo charger cooling systems; determine needed action.
5. Complete NATEF tasks related to Heavy Duty Diesel Engine Fuel System as listed below.
   1. Fuel Supply System
      1. Check fuel level, and condition; determine needed action.
      2. Inspect fuel tanks, vents, caps, mounts, valves, screens, crossover system, supply and return lines and fittings; determine needed action.
   2. Electronic Fuel Management System
      1. Interface with vehicle's on-board computer; perform diagnostic procedures using electronic service tool(s) (to include PC based software and/or data scan tools); determine needed action.
      2. Check and record electronic diagnostic codes and trip/operational data; monitor electronic data; clear codes; determine further diagnosis.
      3. Locate and use relevant service information (to include diagnostic procedures, flow charts, and wiring diagrams).
      4. Inspect and replace electrical connector terminals, seals, and locks.
      5. Inspect high pressure injection lines, hold downs, fittings and seals; determine needed action.