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Heavy Duty Diesel Engines Level III

HDD 202

Heavy Duty Diesel Engines Level III

HDD 202

Course Description

Prerequisites: Prerequisites: HDD 151 with a grade of "C" (2.

0) or better. Corequisites: HDD 205 and HDD 206. Practices the diagnostic procedures and repair of heavy duty diesel engines. Practices NATEF tasks related to heavy duty diesel engines. (15-50)

Outcomes and Objectives

Complete NATEF tasks related to general heavy duty diesel repair as listed below.

Objectives:

  • Check engine no cranking, cranks but fails to start, hard starting, and starts but does not continue to run problems; determine needed action.
  • Identify engine surging, rough operation, misfiring, low power, slow deceleration, slow acceleration, and shutdown problems; determine needed action.

Complete NATEF tasks related to Engine Block of heavy duty diesel engine as listed below.

Objectives:

  • Remove, inspect, service, and install pans, covers, gaskets, seals, wear rings, and crankcase ventilation components.
  • Disassemble, clean, and inspect engine block for cracks/damage; measure mating surfaces for warpage; check condition of passages, core/expansion and gallery plugs; inspect threaded holes, studs, dowel pins, and bolts for serviceability; determine needed action.
  • Inspect cylinder sleeve counter bore and lower bore; check bore distortion; determine needed action.
  • Clean, inspect, and measure cylinder walls or liners for wear and damage; determine needed action.
  • Replace/reinstall cylinder liners and seals; check and adjust liner height (protrusion).
  • Inspect in-block camshaft bearings for wear and damage; determine needed action.
  • Inspect, measure, and replace/reinstall in-block camshaft; measure/adjust end play.
  • Clean and inspect crankshaft for surface cracks and journal damage; check condition of oil passages; check passage plugs; measure journal diameter; determine needed action.
  • Inspect main bearings for wear patterns and damage; replace as needed; check bearing clearances; check and correct crankshaft end play.
  • Inspect, install, and time gear train; measure gear backlash; determine needed action.
  • Inspect connecting rod and bearings for wear patterns; measure pistons, pins, retainers, and bushings; perform needed action.
  • Determine piston-to-cylinder wall clearance; check ring-to-groove fit and end gap; install rings on pistons.
  • Assemble pistons and connecting rods; install in block; install rod bearings and check clearances.
  • Check condition of piston cooling jets (nozzles); determine needed action.

Complete NATEF tasks related to Lubrication Systems of heavy duty diesel engines as listed below.

Objectives:

  • Inspect and measure oil pump, drives, inlet pipes, and pick-up screens; check drive gear clearances; determine needed action.
  • Inspect oil pressure regulator valve(s), by-pass and pressure relief valve(s), oil thermostat, and filters; determine needed action.

Complete NATEF tasks related to Air Induction and Exhause Systems of heavy duty diesel engines as listed below.

Objectives:

  • Remove and reinstall turbocharger/wastegate assembly.
  • Inspect intake manifold, gaskets, and connections; replace as needed.
  • Inspect and test preheater/inlet air heater, or glow plug system and controls; perform needed action.
  • Inspect exhaust gas recirculation (EGR) system including EGR valve, cooler, piping, filter, electronic sensors, controls, and wiring; determine needed action.

Complete NATEF tasks related to Fuel System of heavy duty diesel engines as listed below.

Objectives:

  • Fuel System Supply
  • Electronic Fuel Management System