| A. General |
| MHT1A001 |
Research vehicle service information, including fluid type, vehicle service history, service precautions, and technical service bulletins. |
| MHT1A002 |
Inspect level and condition of fuel, oil, diesel exhaust fluid (DEF), and coolant. |
| MHT1A003 |
Inspect engine assembly for fuel, oil, coolant, air, and other leaks; determine needed action. |
| MHT1A004 |
Diagnose engine operation (starting and running) including: noise, vibration, smoke, etc.; determine needed action. |
| MHT1A005 |
Use appropriate electronic service tool(s) and procedures to diagnose problems; check, record, and clear diagnostic codes; check and record trip/operational data; reset maintenance monitor (if applicable); interpret digital multimeter (DMM) readings. |
| MHT1A006 |
Identify system components, configurations, and types of the following: cylinder head(s), valve train, engine block, engine lubrication, engine cooling, air induction, exhaust, fuel, and engine braking. |
| MHT1A007 |
Diagnose engine no-crank, cranks but fails to start, hard starting, and starts but does not continue to run problems; determine needed action. |
| MHT1A008 |
Diagnose engine surging, rough operation, misfiring, low power, slow deceleration, slow acceleration, and/or shut down problems; determine needed action. |
| B. Cylinder Head and Valve Train |
| MHT1B001 |
Inspect electronic wiring harness and brackets for wear, bending, cracks, and proper securement; determine needed action. |
| MHT1B002 |
Inspect cylinder head for cracks/damage; check mating surfaces for warpage; check condition of passages; inspect core/expansion and gallery plugs; determine needed action. |
| MHT1B003 |
Inspect injector sleeves and seals; determine needed action. |
| MHT1B004 |
Inspect valve train components; determine needed action. |
| MHT1B005 |
Inspect, measure, and replace/reinstall camshaft; measure/adjust end play and backlash. |
| MHT1B006 |
Adjust valve bridges (crossheads); adjust valve clearances and injector settings. |
| MHT1B007 |
Disassemble cylinder head; inspect valves, guides, seats, springs, retainers, rotators, locks, and seals; determine needed action. |
| MHT1B008 |
Measure valve head height relative to deck; measure valve face-to-seat contact; determine needed action. |
| MHT1B009 |
Reassemble cylinder head. |
| MHT1B010 |
Inspect, measure, and replace/reinstall camshaft; measure end play and backlash; determine needed action. |
| C. Engine Block |
| MHT1C001 |
Inspect crankshaft vibration damper; inspect engine mounts; determine needed action. |
| MHT1C002 |
Remove, inspect, service, and install pans, covers, gaskets, seals, wear rings, and crankcase ventilation components; determine needed action. |
| MHT1C003 |
Perform crankcase pressure test; determine needed action. |
| MHT1C004 |
Install and align flywheel housing; inspect flywheel housing(s) to transmission housing/engine mating surface(s); and measure flywheel housing face and bore runout; determine needed action. |
| MHT1C005 |
Inspect flywheel/flexplate (including ring gear) and mounting surfaces for cracks and wear; measure runout; determine needed action. |
| MHT1C006 |
Disassemble and clean engine block; inspect engine block for cracks/damage; measure mating surfaces for warpage; check condition of passages, core/expansion plugs, and gallery plugs; inspect threaded holes, studs, dowel pins, and bolts for serviceability; determine needed action. |
| MHT1C007 |
Inspect cylinder sleeve counter bore and lower bore; check bore distortion; determine needed action. |
| MHT1C008 |
Clean, inspect, and measure cylinder walls or liners for wear and damage; determine needed action. |
| MHT1C009 |
Replace/reinstall cylinder liners and seals; check and adjust liner height (protrusion). |
| MHT1C010 |
Inspect camshaft bearings for wear and damage; determine needed action. |
| MHT1C011 |
Inspect, measure, and replace/reinstall camshaft; measure end play and backlash; determine needed action. |
| MHT1C012 |
Clean and inspect crankshaft for surface cracks and journal damage; check condition of oil passages; check passage plugs; measure journal diameter; determine needed action. |
| MHT1C013 |
Inspect main bearings for wear patterns and damage; replace as needed; check bearing clearances; check and correct crankshaft end play. |
| MHT1C014 |
Inspect, install, and time gear train; measure gear backlash; determine needed action. |
| MHT1C015 |
Inspect connecting rod and bearings for wear patterns; measure pistons, pins, retainers, and bushings; determine needed action. |
| MHT1C016 |
Determine piston-to-cylinder wall clearance; check ring-to-groove fit and end gap; install rings on pistons. |
| MHT1C017 |
Assemble pistons and connecting rods; install in block; install rod bearings and check clearances. |
| MHT1C018 |
Check condition of piston cooling jets (nozzles); determine needed action. |
| D. Lubrication Systems |
| MHT1D001 |
Test engine oil pressure; check operation of pressure sensor, gauge, and/or sending unit; test engine oil temperature; check operation of temperature sensor; determine needed action. |
| MHT1D002 |
Check engine oil level, condition, and consumption; take engine oil sample; determine needed action. |
| MHT1D003 |
Determine proper lubricant; perform oil and filter service. |
| MHT1D004 |
Inspect, clean, and test oil cooler and components; determine needed action. |
| MHT1D005 |
Inspect turbocharger lubrication systems; determine needed action. |
| MHT1D006 |
Inspect and measure oil pump, drives, inlet pipes, and pick-up screens; check drive gear clearances; determine needed action. |
| MHT1D007 |
Inspect oil pressure regulator valve(s), by-pass and pressure relief valve(s), oil thermostat, and filters; determine needed action. |
| E. Cooling System |
| MHT1E001 |
Check engine coolant type, level, and condition; test coolant for freeze protection and additive package concentration. |
| MHT1E002 |
Test coolant temperature; test operation of temperature and level sensors, gauge, and/or sending unit; determine needed action. |
| MHT1E003 |
Inspect and reinstall/replace pulleys, tensioners and drive belts; adjust drive belts and check alignment. |
| MHT1E004 |
Recover coolant; flush and refill with recommended coolant/additive package; bleed cooling system. |
| MHT1E005 |
Inspect coolant conditioner/filter assembly for leaks; inspect valves, lines, and fittings; replace as needed. |
| MHT1E006 |
Inspect water pump, hoses, and clamps; determine needed action. |
| MHT1E007 |
Inspect and pressure test cooling system(s); pressure test cap, tank(s), and recovery systems; inspect radiator and mountings; determine needed action. |
| MHT1E008 |
Inspect, test, and repair thermostatic cooling fan system (hydraulic, pneumatic, and electronic) and fan shroud; determine needed action. |
| MHT1E009 |
Test engine block heater(s); determine needed action. |
| MHT1E010 |
Diagnose engine coolant consumption; determine needed action. |
| MHT1E011 |
Inspect thermostat(s), by-passes, housing(s), and seals; replace as needed. |
| MHT1E012 |
Inspect turbocharger cooling systems; determine needed action. |
| F. Air Induction and Exhaust Systems |
| MHT1F001 |
Inspect turbocharger(s), wastegate(s), and piping systems; determine needed action. |
| MHT1F002 |
Diagnose air induction system problems; inspect, clean, and/or replace cooler assembly, piping, hoses, clamps, and mountings; replace air filter as needed; reset restriction indicator (if applicable). |
| MHT1F003 |
Inspect intake manifold, gaskets, and connections; determine needed action. |
| MHT1F004 |
Inspect engine exhaust system, exhaust gas recirculation (EGR) system, and exhaust aftertreatment system for leaks, mounting, proper routing, and damaged or missing components; determine needed action. |
| MHT1F005 |
Inspect crankcase ventilation system; service as needed. |
| MHT1F006 |
Diagnose problems/faults in the exhaust gas recirculation (EGR) system including: EGR valve, cooler, piping, filter, electronic sensors, controls, and wiring; determine needed action. |
| MHT1F007 |
Perform air intake system restriction and leakage tests; determine needed action. |
| MHT1F008 |
Perform intake manifold pressure (boost) test; determine needed action. |
| MHT1F009 |
Check exhaust back pressure; determine needed action. |
| MHT1F010 |
Inspect variable ratio geometry turbocharger (VGT), controls, and actuators (pneumatic, hydraulic, and electronic); determine needed action. |
| MHT1F011 |
Demonstrate knowledge of charge air cooler operation and testing. |
| MHT1F012 |
Diagnose exhaust aftertreatment system performance problems; determine needed action. |
| MHT1F013 |
Diagnose preheater/inlet air heater or glow plug system and controls: determine needed action. |
| G. Fuel System |
| MHT1G001 |
Check fuel level and condition; determine needed action. |
| MHT1G002 |
Inspect fuel tanks, vents, caps, mounts, valves, screens, crossover system, hoses, lines, and fittings; determine needed action. |
| MHT1G003 |
Inspect low pressure fuel system components (fuel pump, pump drives, screens, fuel/water separators/indicators, hoses, lines, filters, heaters, coolers, ECM cooling plates, check valves, pressure regulator valves, restrictive fittings, and mounting hardware); determine needed action. |
| MHT1G004 |
Replace fuel filter; prime and bleed fuel system. |
| MHT1G005 |
Inspect high pressure fuel system components (fuel pump, pump drives, hoses, injection lines, filters, hold-downs, fittings, seals, and mounting hardware). |
| MHT1G006 |
Demonstrate knowledge and understanding of the different types of fuel systems. |
| MHT1G007 |
Perform fuel supply and return system tests; determine needed action. |
| MHT1G008 |
Perform cylinder contribution test using electronic service tool(s). |
| MHT1G009 |
Demonstrate knowledge of how to set performance parameters using electronic service tools and service information system access. |
| H. Engine Brakes |
| MHT1H001 |
Inspect engine compression and/or exhaust brake housing, valves, seals, lines, and fittings; determine needed action. |
| MHT1H002 |
Inspect and adjust engine compression and/or exhaust brake systems; determine needed action. |
| MHT1H003 |
Inspect, test, and adjust engine compression and/or exhaust brake control circuits, switches, and solenoids; determine needed action. |