NATEF Task List
Automotive Engine Repair - AUTM. 1419
For every task in Engine Repair, the following safety requirement must be strictly enforced:
Comply with personal and environmental safety practices associated with clothing; eye protection; hand tools;
power equipment; proper ventilation; and the handling, storage, and disposal of chemicals/materials in
accordance with local, state, and federal safety and environmental regulations.
NATEF
Tasks
A
I.A.1
I.A.2
I.A.3
I.A.4
I.A.5
I.A.6
I.A.7
I.A.8
I.A.9
I.A.10
I.A.11
I.A.12
B
I.B.1
I.B.2
I.B.3
I.B.4
I.B.5
I.B.6
I.B.7
I.B.8
Description
General Engine Diagnosis; Removal and Reinstallation (R & R)
Identify and interpret engine concern; determine necessary action.
Research applicable vehicle and service information,
such as internal engine operation, vehicle service history,
service precautions, and technical service bulletins
Locate and interpret vehicle and major component identification
numbers (VIN, vehicle certification labels, and calibration decals).
Inspect engine assembly for fuel, oil, coolant, and other leaks;
determine necessary action.
Diagnose engine noises and vibrations; determine necessary action.
Diagnose the cause of excessive oil consumption, unusual engine
exhaust color, odor and sound; determine necessary action.
Perform engine vacuum test; determine necessary action.
Perform cylinder power balance tests determine necessary action.
Perform cylinder compression test; determine necessary action.
Perform cylinder leakage test; determine necessary action.
Remove and reinstall in a late model front-wheel
drive vehicle (OBDI or newer); reconnect all attaching components
and restore the vehicle to running condition.
Remove and reinstall in a late model rear-wheel
drive vehicle (OBDI or newer); reconnect all attaching components
and restore the vehicle to running condition.
Cylinder Head and Valve Train Diagnosis and Repair
Remove cylinder head (s); visually inspect cylinder head (s)
for cracks; check gasket surface areas for warpage and leakage;
check passage condition.
Install cylinder heads and gaskets; tighten according
to manufacturer's specifications and procedures.
Inspect valve springs for squareness and free height comparison;
determine necessary action.
Replace valve stem seals on an assembled engine; inspect valve
spring retainers, locks, and valve grooves;
determine necessary action.
Inspect valve guides for wear for wear; check valve stem-to-guide
clearance; determine necessary action.
Inspect valves and valve seats; determine necessary action.
Check valve face-to-seat contact and valve seat
concentricity (runout); determine necessary action.
Check valve spring assembled height and valve stem height;
determine necessary action.
Priority Task
Training
P-1
P-1
P-1
P-1
P-2
P-2
P-1
P-1
P-1
P-1
P-1
P-3
P-2
P-1
P-2
P-2
P-3
P-3
P-3
P-3
Task
Mastery
I.B.9
I.B.10
I.B.11
I.B.12
I.B.13
I.B.14
I.B.15
I.B.16
C
I.C.1
I.C.2
I.C.3
I.C.4
I.C.5
I.C.6
I.C.7
I.C.8
I.C.9
I.C.10
I.C.11
I.C.12
I.C.13
I.C.14
I.C.15
Inspect pushrods, rocker arms, rocker arm pivots and shafts
for wear, bending, cracks looseness, and blocked
oil passages (orifices); determine necessary action.
Inspect hydraulic or mechanical lifters; determine necessary action.
Adjust valves (mechanical or hydraulic lifters).
Inspect camshaft drives (including gear wear and backlash,
sprocket and chain wear); determine necessary action.
Inspect and replace timing belts (chains), overhead
camdrive sprockets, and tensioners; check belt/chain
tension; adjust as necessary.
Inspect camshaft for runout, journal wear and lobe wear.
Inspect camshaft bearing surface for wear, damage, out-of-round,
and alignment; determine necessary action.
Establish camshaft(s) timing and cam sensor indexing according
to manufacturer's specifications and procedures.
Engine Block Assembly Diagnosis and Repair
Disassemble engine block; clean and prepare components
for inspection and reassembly.
Inspect engine block for visible cracks, passage condition, core
gallery plug condition, and surface warpage;
determine necessary action.
Inspect internal and external threads; restore as needed
(includes installing thread inserts).
Inspect and measure cylinder walls for damage, wear, and ridges;
determine necessary action.
Deglaze and clean cylinder walls.
Inspect and measure camshaft bearings for wear, damage,
out-of-round, and alignment; determine necessary action.
Inspect crankshaft for end play, straightness, journal damage,
keyway damage, thrust flange and sealing surface condition, and
visual surface cracks;check oil passage condition; measure journal
wear; check crankshaft sensor reluctor ring (where applicable);
determine necessary action.
Inspect and measure main and connecting rod bearings for damage,
clearance, and end play; determine necessary action
(includes the proper selection of bearings).
Identify piston and bearing wear patterns that indicate connecting
rod alignment and main bearing bore problems;
inspect rod alignment and bearing bore condition.
Inspect and measure pistons and pins; determine necessary action.
Remove and replace piston pin.
Inspect, measure, and install piston rings.
Inspect auxiliary (balance, intermediate, idler, counterbalance or
silencer) shaft(s); inspect shaft (s) and support bearings for
damage and wear; determine necessary action; reinstall and time.
Inspect or replace crankshaft vibration damper (harmonic balancer).
Assemble the engine using gaskets, seals, and formed-in-place
(tube applied) sealants, thread sealers, etc.
according to manufacturer's specifications.
P-2
P-2
P-1
P-2
P-1
P-2
P-3
P-1
P-2
P-2
P-2
P-2
P-2
P-3
P-2
P-2
P-3
P-2
P-3
P-1
P-2
P-3
P-2
D
I.D.1
I.D.2
I.D.3
I.D.4
I.D.5
I.D.6
I.D.7
I.D.8
I.D.9
I.D.10
I.D.11
I.D.12
I.D.13
Lubrication and Cooling Systems Diagnosis and Repair
Perform oil pressure tests; determine necessary action.
Inspect oil pump gears or rotors, housing, pressure relief devices,
and pumpdrive; determine necessary action.
Perform cooling system, cap, and recovery system tests
(pressure, combustion leakage, and temperature);
determine necessary action.
Inspect, replace, and adjust drive belts, tensioners, and pulleys;
check pulley and belt alignment.
Inspect and replace engine cooling and heater system hoses.
Inspect, test, and replace thermostat and housing.
Test coolant; drain and recover coolant; flush and refill cooling
system with recommended coolant; bleed air as required.
Inspect, test, remove, and replace water pump.
Remove and replace radiator.
Inspect, and test fans (electrical or mechanical), fan clutch,
fan shroud, and air dams.
Inspect auxiliary oil coolers; determine necessary action.
Inspect, test, and replace oil temperature and pressure
switches and sensors.
Perform oil and filter change.
P-1
P-2
P-1
P-1
P-1
P-2
P-1
P-1
P-2
P-2
P-3
P-2
P-2
Instructions:
Each NATEF task is for Engine Repair is displayed and described.
The last three columns are the tasks priority, task training and task
mastery. In the"task training" column;list the type of training
received on that task. In the "task mastery" column list on a scale
(1-5) how well you feel you have mastered the task.
Print and return form to your instructor for signature.
Instructor Signature:_______________________________
Print:_______________________________
Date:_______________________________