| General Engine Repair |
| MAST1002 |
Research vehicle service information such as fluid type, internal combustion engine operation, vehicle service history, service precautions, technical service bulletins, and recalls, including vehicles equipped with advanced driver assistance systems (ADAS). |
| MAST1050 |
Retrieve and record DTCs, OBD monitor status, and freeze frame data; clear codes and data when directed. |
| MAST1003 |
Verify operation of the instrument panel engine warning indicators. |
| MAST1004 |
Inspect engine assembly for fuel, oil, coolant, and other leaks; determine needed action. |
| MAST1005 |
Install engine covers using gaskets, seals, and sealers as required. |
| MAST1006 |
Verify engine mechanical timing. |
| MAST1008 |
Inspect, remove, and/or replace engine mounts. |
| MAST1009 |
Identify service precautions related to service of the internal combustion engine of a hybrid electric vehicle. |
| MAST1054 |
Remove and reinstall engine on a newer vehicle equipped with OBD |
| Cylinder Head and Valve Train |
| MAST1051 |
Identify cylinder head and valve train components and configurations. |
| MAST1010 |
Remove cylinder head |
| MAST1011 |
Clean and visually inspect a cylinder head for cracks |
| MAST1012 |
Inspect valve actuating mechanisms for wear, bending, cracks, looseness, and blocked oil passages (orifices); determine needed action. |
| MAST1013 |
Adjust valves (mechanical or hydraulic lifters). |
| MAST1014 |
Inspect and replace camshaft and drive belt/chain; includes checking drive gear wear and backlash, end play, sprocket and chain wear, overhead cam drive sprocket(s), drive belt(s), belt tension, tensioners, camshaft reluctor ring/tone-wheel, and valve timing components; verify correct camshaft timing. |
| MAST1016 |
Inspect valve springs for squareness and free height comparison |
| MAST1017 |
Replace valve stem seals on an assembled engine; inspect valve spring retainers, locks/keepers, and valve lock/keeper grooves; determine needed action. |
| MAST1018 |
Inspect valve guides for wear |
| MAST1019 |
Inspect valves and valve seats |
| MAST1020 |
Check valve spring assembled height and valve stem height |
| MAST1021 |
Inspect valve lifters and hydraulic lash adjusters |
| MAST1022 |
Inspect and/or measure camshaft for runout, journal wear, and lobe wear. |
| MAST1055 |
Inspect camshaft bearing surface for wear, damage, out-of-round, and alignment; determine needed action. |
| Engine Block Assembly |
| MAST1052 |
Identify engine block assembly components and configurations. |
| MAST1023 |
Remove, inspect, and/or replace crankshaft vibration damper (harmonic balancer). |
| MAST1024 |
Disassemble engine block |
| MAST1025 |
Inspect engine block for visible cracks, passage condition, core and gallery plug condition, and surface warpage; determine needed action. |
| MAST1026 |
Inspect and measure cylinder walls/sleeves for damage, wear, and ridges; determine needed action. |
| MAST1027 |
Perform deglazing and cleaning of cylinder walls. |
| MAST1028 |
Inspect and measure camshaft bearings for wear, damage, out-of-round, and alignment; determine needed action. |
| MAST1029 |
Inspect crankshaft for straightness, journal damage, keyway damage, thrust flange and sealing surface condition, and visual surface cracks; check oil passage condition; measure end play and journal wear; check crankshaft position sensor reluctor ring (where applicable); determine needed action. |
| MAST1030 |
Inspect main and connecting rod bearings for damage and wear |
| MAST1031 |
Identify piston and bearing wear patterns that indicate connecting rod alignment and main bearing bore problems |
| MAST1032 |
Inspect and measure piston skirts and ring lands |
| MAST1033 |
Determine piston-to-bore clearance. |
| MAST1034 |
Inspect, measure, and install piston rings. |
| MAST1035 |
Inspect auxiliary shaft(s) (balance, intermediate, idler, counterbalance and/or silencer); inspect shaft(s) and support bearings for damage and wear; determine needed action; reinstall and time. |
| MAST1036 |
Assemble engine block. |
| Lubrication and Cooling Systems |
| MAST1053 |
Identify lubrication and cooling system components and configurations. |
| MAST1046 |
Perform engine oil and filter change |
| MAST1037 |
Perform cooling system pressure and dye tests to identify leaks; check coolant condition and level; inspect and test radiator, pressure cap, coolant recovery tank, heater core, and galley plugs; determine needed action. |
| MAST1038 |
Identify causes of engine overheating. |
| MAST1039 |
Inspect, replace, and/or adjust drive belts, tensioners, and pulleys; check pulley and belt alignment. |
| MAST1040 |
Inspect and test coolant |
| MAST1041 |
Inspect, remove, and replace water pump. |
| MAST1043 |
Remove, inspect, and replace thermostat and gasket/seal. |
| MAST1042 |
Remove and replace radiator. |
| MAST1044 |
Inspect and test fan(s), fan clutch (electrical or mechanical), fan shroud, and air dams; determine needed action. |
| MAST1045 |
Perform oil pressure tests |
| MAST1047 |
Inspect auxiliary coolers |
| MAST1048 |
Inspect, test, and/or replace oil temperature and pressure switches and sensors. |
| MAST1049 |
Inspect oil pump gears or rotors, housing, pressure relief devices, and pump drive; determine needed action. |
| Tasksheets Included From Other ASE Foundation Standards |
| MAST6031 |
Inspect, adjust, and/or replace generator (alternator) drive belts; check pulleys and tensioners for wear; check pulley and belt alignment; determine needed action. |
| MAST7023 |
Inspect engine cooling and heater systems hoses and pipes |
| MAST7026 |
Determine procedure to remove, inspect, reinstall, and/or replace heater core; properly refill system. |
| MAST8010 |
Verify proper engine cooling system operation |