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TEST SPECIFICATIONS AND TASK LISTS FOR THE NATIONAL AUTOMOTIVE STUDENT SKILLS STANDARDS ASSESSMENT - page 2 / 9

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2 / 9

A. General

7

B. Cylinder Head And Valve Train

4

C. Engine Block

3

D. Lubrication System

4

E. Cooling System

7

F. Air Induction, Exhaust Systems and Engine Brakes

7

G. Fuel System

8

Required To Pass: TBD of 40

40

DIESEL ENGINES

A. General

Content Area

Questions In Test

  • 1.

    Inspect fuel, oil, and coolant levels, and condition; determine needed action.

  • 2.

    Identify the causes of 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 causes of no cranking, cranks but fails to start, hard starting, and starts but does not continue to

run problems; determine needed action.

6.

Identify causes of surging, rough operation, misfiring, low power, slow deceleration, slow acceleration, and shutdown problems; determine needed action.

  • 7.

    Identify engine vibration problems; determine needed action.

  • 8.

    Check and record electronic diagnostic codes and trip/operational data; monitor electronic data; verify

customer programmable parameters; clear codes; determine further diagnosis.

  • B.

    Cylinder Head and Valve Train

    • 1.

      Remove, clean, inspect for visible damage, and replace cylinder head(s) assembly.

    • 2.

      Clean and inspect threaded holes, studs, and bolts for serviceability; determine needed action.

    • 3.

      Inspect cylinder head for cracks/damage; check mating surfaces for warpage; check condition of

passages; inspect core/expansion and gallery plugs; determine needed action.

4.

Disassemble head and inspect valves, guides, seats, springs, retainers, rotators, locks, and seals; determine needed action.

  • 5.

    Measure valve head height relative to deck and valve face-to-seat contact; determine needed action.

  • 6.

    Inspect injector sleeves and seals; measure injector tip or nozzle protrusion; determine needed action.

  • 7.

    Inspect valve train components; determine needed action.

  • 8.

    Reassemble cylinder head.

Effective: January 2010

2

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