Sets Focus Area: with Performance (KS/PI) Automotive Service Technology AHTA10.04 Perform skills and determine necessary actions needed in the automatic transmission area of automotive service and repair. AHTA10.04.05.03 Performance : Identify and interpret transmission-transaxle concern; assure proper engine operation. AHTA10.04.05.04 Perform pressure and stall tests. AHTA10.04.05.05 Perform lock-up converter system tests. AHTA10.04.05.06 Diagnose mechanical and vacuum control system concerns. AHTA10.04.05.07 Diagnose noise and vibration concerns. AHTA10.04.05.08 AHTA10.04.05.09 AHTA10.04.05.10 AHTA10.04.05.11 AHTA10.04.05.12 AHTA10.04.05.13 AHTA10.04.05.14 Diagnose transmission/transaxle gear reduction/multiplication concerns using driving, driven, and held member (power flow) principles. Diagnose pressure concerns in a transmission using hydraulic principles (Pascal's Law). Diagnose electrical/electronic concerns using principles of electricity (Ohm's Law). Inspect, adjust or replace throttle valve (TV) linkages or cables; manual shift linkages or cables; transmission range sensor; check gear select indicator (as applicable). Inspect, adjust or replace (as applicable) vacuum modulator; inspect and repair or replace lines and hoses. Inspect extension housing, bushings and seals. Inspect and replace speedometer drive gear, driven gear, vehicle speed sensor (VSS), and retainers. Diagnose electronic transmission control systems using a scan tool. AHTA10.04.05.15 Inspect and replace external seals and gaskets. AHTA10.04.05.16 AHTA10.04.05.17 Remove and reinstall transmission and torque converter (rear-wheel drive). Remove and reinstall transaxle and torque converter assembly. Page 1 of 16
AHTA10.04.05.18 Air test operation of clutch and servo assemblies. AHTA10.04.05.19 Inspect, repair, and replace governor assembly. AHTA10.05 Perform skills and determine necessary actions needed in the manual drive train and axles area of automotive service and repair. Performance : AHTA10.05.05.10 Identify and interpret drive train concern. AHTA10.05.05.11 Diagnose clutch noise, binding, slippage, pulsation, and chatter. AHTA10.05.05.12 Inspect release (throw-out) bearing, lever, and pivot. AHTA10.05.05.13 Inspect engine block, clutch (bell) housing, transmission/transaxle case mating surfaces, and alignment dowels. AHTA10.05.05.14 Remove and reinstall transmission/transaxle. AHTA10.05.05.15 AHTA10.05.05.16 AHTA10.05.05.17 AHTA10.05.05.18 AHTA10.05.05.19 AHTA10.05.05.20 Disassemble, clean, and reassemble transmission/transaxle components. Inspect transmission/transaxle case, extension housing, case mating surfaces, bores, bushings, and vents. Diagnose noise, hard shifting, jumping out of gear, and fluid leakage concerns. Diagnose transaxle final drive assembly noise and vibration concerns. Inspect, test, and replace transmission/transaxle sensors and switches. Diagnose constant-velocity (CV) joint noise and vibration concerns. AHTA10.05.05.21 Diagnose universal joint noise and vibration concerns. AHTA10.05.05.22 AHTA10.05.05.23 AHTA10.05.05.24 AHTA10.05.05.25 Remove and replace front wheel drive (FWD) front wheel bearing. Inspect, service, and replace shafts, yokes, boots, and CV joints. Inspect, service, and replace shaft center support bearings. Check shaft balance and phasing; measure shaft runout; measure and adjust driveline angles. Page 2 of 16
AHTA10.05.05.26 Diagnose noise and vibration concerns. AHTA10.05.05.27 Inspect and replace companion flange and pinion seal; measure companion flange runout. AHTA10.05.05.28 Inspect ring gear and measure runout. AHTA10.05.05.29 Remove, inspect, and reinstall drive pinion and ring gear, spacers, sleeves, and bearings. AHTA10.05.05.30 Measure and adjust drive pinion depth. AHTA10.05.05.31 Measure and adjust drive pinion bearing preload. AHTA10.05.05.32 Measure and adjust side bearing preload and ring and pinion gear total backlash and backlash variation on a differential carrier assembly (threaded cup or shim types). AHTA10.05.05.33 Check ring and pinion tooth contact patterns. AHTA10.05.05.34 AHTA10.05.05.35 Disassemble, inspect, measure, and adjust or replace differential pinion gears (spiders), shaft, side gears, side bearings, thrust washers, and case. Reassemble and reinstall differential case assembly; measure runout. AHTA10.05.05.36 Diagnose noise, slippage, and chatter concerns. AHTA10.05.05.37 Clean and inspect differential housing; refill with correct lubricant. AHTA10.05.05.38 Inspect and reinstall clutch (cone or plate) components. AHTA10.05.05.39 Measure rotating torque. AHTA10.05.05.40 Diagnose drive axle shafts, bearings, and seals for noise, vibration, and fluid leakage concerns. AHTA10.05.05.41 Remove and replace drive axle shafts. AHTA10.05.05.42 Inspect and replace drive axle shaft seals, bearings, and retainers. AHTA10.05.05.43 Measure drive axle flange runout and shaft endplay. AHTA10.05.05.44 AHTA10.05.05.45 Diagnose noise, vibration, and unusual steering concerns. Inspect, adjust, and repair shifting controls (mechanical, electrical, and vacuum), bushings, mounts, levers, and brackets. AHTA10.05.05.46 Remove and reinstall transfer case. Page 3 of 16
AHTA10.05.05.47 Inspect front-wheel bearings and locking hubs. AHTA10.05.05.48 AHTA10.05.05.49 Check drive assembly seals and vents; check lube level. Diagnose, test, adjust, and replace electrical/electronic components of four- wheel drive systems. AHTA10.06 Perform skills and determine necessary actions needed in the suspension and steering area of automotive service and repair. AHTA10.06.05.14 AHTA10.06.05.15 AHTA10.06.05.16 AHTA10.06.05.17 AHTA10.06.05.18 AHTA10.06.05.19 AHTA10.06.05.20 AHTA10.06.05.21 Performance : Remove and replace steering wheel; center supplemental restraint system (SRS) coil (clock spring). Diagnose steering column noises, looseness, and binding concerns (including tilt mechanisms). Diagnose power steering gear (non-rack and pinion) binding, uneven turning effort, looseness, hard steering, noise, and fluid leakage concerns. Diagnose power steering gear (rack and pinion) binding, uneven turning effort, looseness, hard steering, noise, and fluid leakage concerns. Inspect steering shaft universal-joint(s), flexible coupling(s), collapsible column, lock cylinder mechanism, and steering wheel. Adjust manual or power non-rack and pinion worm bearing preload and sector lash. Remove and replace manual or power rack and pinion steering gear; inspect mounting bushings and brackets. Inspect and replace manual or power rack and pinion steering gear inner tie rod ends (sockets) and bellows boots. AHTA10.06.05.22 Diagnose power steering fluid leakage. AHTA10.06.05.24 Inspect and replace power steering hoses and fittings. AHTA10.06.05.25 AHTA10.06.05.26 AHTA10.06.05.27 Inspect and replace pitman arm, relay (center link) rod, idler arm and mountings, and steering linkage damper. Inspect, replace, and adjust tie rod ends (sockets), tie rod sleeves, and clamps. Test and diagnose components of electronically controlled steering systems using a scan tool. Page 4 of 16
AHTA10.06.05.28 AHTA10.06.05.29 AHTA10.06.05.30 AHTA10.06.05.31 AHTA10.06.05.37 AHTA10.06.05.40 AHTA10.06.05.41 AHTA10.06.05.42 AHTA10.06.05.44 AHTA10.06.05.45 Inspect and test non-hydraulic electric power assist steering. Diagnose short and long arm suspension system noises, body sway, and uneven riding height concerns. Diagnose strut suspension system noises, body sway, and uneven riding height concerns. Remove, inspect, and install upper and lower control arms, bushings, shafts, and rebound bumpers. Remove, inspect, and install stabilizer bar bushings, brackets, and links. Remove, inspect, and install coil springs and spring insulators. Remove, inspect, and install transverse links, control arms, bushings, and mounts. Remove, inspect, and install leaf springs, leaf spring insulators (silencers), shackles, brackets, bushings, and mounts. Test and diagnose components of electronically controlled suspension systems using a scan tool. Diagnose vehicle wander, drift, pull, hard steering, bump steer, memory steer, torque steer, and steering return concerns. AHTA10.06.05.46 Check and adjust front and rear wheel camber. AHTA10.06.05.47 Check and adjust caster. AHTA10.06.05.48 Check and adjust front wheel toe and center steering wheel. AHTA10.06.05.49 Check toe-out-on-turns (turning radius). AHTA10.06.05.50 Check SAI (steering axis inclination) and included angle. AHTA10.06.05.51 Check and adjust rear wheel toe. AHTA10.06.05.52 Check rear wheel thrust angle. AHTA10.06.05.53 Check for front wheel setback. AHTA10.06.05.54 Check front cradle (sub frame) alignment. AHTA10.06.05.56 Diagnose tire pull (lead) problem. AHTA10.06.05.57 Dismount, inspect, and remount tire on wheel equipped with tire pressure sensor. Page 5 of 16
AHTA10.06.05.58 Inspect, diagnose, and calibrate tire pressure monitoring system. AHTA10.07 Perform skills and determine necessary actions needed in the brakes area of automotive service and repair. AHTA10.07.05.10 AHTA10.07.05.14 AHTA10.07.05.15 AHTA10.07.05.16 AHTA10.07.05.17 AHTA10.07.05.19 AHTA10.07.05.26 AHTA10.07.05.27 AHTA10.07.05.31 AHTA10.07.05.32 AHTA10.07.05.33 AHTA10.07.05.34 AHTA10.07.05.35 Performance : Diagnose pressure concerns in the brake system using hydraulic principles (Pascal's Law). Diagnose poor stopping, pulling or dragging concerns caused by malfunctions in the hydraulic system. Fabricate and/or install brake lines (double flare and IS0 types); replace hoses, fittings, and supports as needed. Inspect, test, and/or replace metering (hold-off), proportioning (balance), pressure differential, and combination valves. Inspect, test, and adjust height (load) sensing proportioning valve. Diagnose poor stopping, noise, vibration, pulling, grabbing, dragging or pedal pulsation concerns. Test pedal free travel with and without engine running; check power assist operation. Inspect and test hydraulically assisted power brake system for leaks and proper operation. Diagnose poor stopping, wheel lock-up, abnormal pedal feel or pulsation, and noise concerns caused by the antilock brake system (ABS). Diagnose antilock brake system (ABS) electronic control(s) and components using self-diagnosis and/or recommended test equipment. Depressurize high-pressure components of the antilock brake system (ABS). Bleed the antilock brake system's (ABS) front and rear hydraulic circuits. Remove and install antilock brake system (ABS) electrical/electronic and hydraulic components. Page 6 of 16
AHTA10.07.05.36 AHTA10.07.05.37 AHTA10.07.05.38 Test, diagnose and service ABS speed sensors, toothed ring (tone wheel), and circuits using a graphing multimeter (GMM)/digital storage oscilloscope (DSO) (includes output signal, resistance, shorts to voltage/ground, and frequency data). Diagnose antilock brake system (ABS) braking concerns caused by vehicle modifications (tire size, curb height, final drive ratio, etc.). Identify traction control vehicle stability control system components. AHTA10.08 Perform skills and determine necessary actions needed in the electrical/electronic systems area of automotive service and repair. AHTA10.08.05.13 AHTA10.08.05.14 AHTA10.08.05.15 AHTA10.08.05.16 AHTA10.08.05.17 AHTA10.08.05.20 AHTA10.08.05.21 AHTA10.08.05.22 AHTA10.08.05.23 AHTA10.08.05.24 Performance : Identify and interpret electrical/electronic system concern. Identify location of hybrid vehicle high voltage circuit disconnect (service plug) location and safety procedures. Identify high voltage circuits of electric or hybrid electric vehicle and related safety precautions. Identify electronic modules, security systems and/or radios that require reinitialization or code entry following battery disconnect. Identify hybrid vehicle auxiliary (12v) battery service, repair and test procedures. Identify system voltage and safety precautions associated with high intensity discharge headlights. Inspect and test gauges and gauge sending units for cause of intermittent, high, low, or no gauge readings. Inspect and test connectors, wires, and printed circuit boards of gauge circuits. Diagnose the cause of incorrect operation of warning devices and other driver information systems. Diagnose radio static and weak, intermittent, or no radio reception. AHTA10.08.05.25 Remove and reinstall door panel. AHTA10.08.05.26 Diagnose body electronic system circuits using a scan tool. Page 7 of 16
AHTA10.08.05.27 AHTA10.08.05.28 Check for module communication (including CANBUS systems) errors using a scan tool. Diagnose the cause of false, intermittent, or no operation of anti-theft systems. AHTA10.09 Perform skills and determine necessary actions needed in the engine performance area of automotive service and repair. AHTA10.09.05.05 Performance : Prepare 4 or 5-gas analyzer; inspect and prepare vehicle for test, and obtain exhaust readings. AHTA10.09.05.11 Perform engine running compression test. AHTA10.09.05.12 Diagnose engine mechanical, electrical, electronic, fuel, and ignition concerns with an oscilloscope and/or engine diagnostic equipment. AHTA10.09.05.13 Verify correct camshaft timing. AHTA10.09.05.14 AHTA10.09.05.15 AHTA10.09.05.16 AHTA10.09.05.17 AHTA10.09.05.18 Diagnose the causes of emissions or driveability concerns resulting from malfunctions in the computerized engine control system with stored diagnostic trouble codes. Diagnose emissions or driveability concerns resulting from malfunctions in the computerized engine control system with no stored diagnostic trouble codes. Check for module communication (including CAN/BUS systems) errors using a scan tool. Inspect and test computerized engine control system sensors, power train control module (PCM), actuators, and circuits using a graphing multimeter (GMM)/digital storage oscilloscope (DSO). Diagnose driveability and emissions problems resulting from malfunctions of interrelated systems (cruise control, security alarms, suspension controls, traction controls, A/C, automatic transmissions, non-oeminstalled accessories, or similar systems). AHTA10.09.05.19 Perform active tests of actuators using scan tool. AHTA10.09.05.20 Diagnose ignition system related problems such as nostarting, hard starting, engine misfire, poor driveability, spark knock, power loss, poor mileage, and emissions concerns on vehicles with electronic ignition systems. AHTA10.09.05.21 Inspect, test and service distributor. Page 8 of 16
AHTA10.09.05.25 AHTA10.09.05.26 Inspect and test ignition system pick-up sensor or triggering devices. Diagnose hot or cold no-starting, hard starting, poor driveability, poor idle, flooding, hesitation, surging, engine misfire, power loss, stalling, poor mileage, dieseling, and emissions problems on vehicles with injection-type fuel systems. AHTA10.09.05.27 Check fuel for contaminants and quality. AHTA10.09.05.28 AHTA10.09.05.29 AHTA10.09.05.30 Inspect and test fuel pumps and pump control systems for pressure, regulation, and volume. Inspect and test cold enrichment system and components. Inspect throttle body, air induction system, intake manifold and gaskets for vacuum leaks and/or unmetered air. AHTA10.09.05.31 Inspect and test fuel injectors. AHTA10.09.05.34 Perform exhaust system back-pressure test. AHTA10.09.05.35 AHTA10.09.05.36 AHTA10.09.05.38 AHTA10.09.05.39 AHTA10.09.05.40 AHTA10.09.05.41 AHTA10.09.05.42 AHTA10.09.05.43 Test the operation of turbocharger/supercharger systems. Diagnose oil leaks, emissions, and driveability problems resulting from malfunctions in the positive crankcase ventilation (PCV) system. Diagnose emissions and driveability problems caused by malfunctions in the exhaust gas recirculation (EGR) system. Inspect, test, service and replace components of the EGR system, including EGR tubing, exhaust passages, vacuum/pressure controls, filters and hoses. Inspect and test electrical/electronic sensors, controls, and wiring of exhaust gas recirculation (EGR) systems. Diagnose emissions and driveability problems resulting from malfunctions in the secondary air injection and catalytic converter systems. Inspect and test mechanical components of secondary air injection systems. Inspect and test electrical/electronically-operated components and circuits of air injection systems. AHTA10.09.05.44 Inspect and test catalytic converter performance. Page 9 of 16
AHTA10.09.05.45 AHTA10.09.05.46 AHTA10.09.05.47 AHTA10.09.05.49 AHTA10.09.05.52 Diagnose emissions and driveability problems resulting from malfunctions in the evaporative emissions control system. Inspect and test components and hoses of evaporative emissions control system. Interpret evaporative emission related diagnostic trouble codes (DTCs). Remove and replace timing belt; verify correct camshaft timing. Identify hybrid vehicle internal combustion engine service precautions. AHTA10.10 Perform skills and determine necessary actions needed in the engine repair area of automotive service and repair. Performance : AHTA10.10.05.06 Diagnose engine noises and vibrations. AHTA10.10.05.07 Diagnose the cause of excessive oil consumption, unusual engine exhaust color, odor, and sound. AHTA10.10.05.08 Identify and interpret engine concern. AHTA10.10.05.09 AHTA10.10.05.10 AHTA10.10.05.11 Remove and reinstall engine in a front-wheel or rear wheel drive vehicle (OBDII or newer); reconnect all attaching components and restore the vehicle to running condition. Install engine covers using gaskets, seals and sealers as required. Inspect oil pump gears or rotors, housing, pressure relief devices, and pump drive. AHTA10.10.05.13 Inspect, test, remove, and replace water pump. AHTA10.10.05.14 Inspect auxiliary oil coolers. AHTA10.11 Perform skills and determine necessary actions needed in the heating and air conditioning area of automotive service and repair. AHTA10.11.05.01 AHTA10.11.05.02 Performance : Identify and interpret heating and air conditioning concern. Performance test A/C system; diagnose A/C system malfunctions using principles of refrigeration. Page 10 of 16
AHTA10.11.05.03 Diagnose abnormal operating noises in the A/C system. Identify refrigerant type; select and connect proper gauge set; record pressure readings. AHTA10.11.05.04 Leak test A/C system. AHTA10.11.05.05 Inspect the condition of discharged oil. AHTA10.11.05.06 Determine recommended oil for system application. AHTA10.11.05.07 AHTA10.11.05.08 Using scan tool, observe and record related HVAC data and trouble codes. Diagnose A/C system conditions that cause the protection devices (pressure, thermal, and PCM) to interrupt system operation. AHTA10.11.05.09 Inspect and replace A/C compressor drive belts. AHTA10.11.05.10 AHTA10.11.05.11 AHTA10.11.05.12 Inspect, test, and/or replace A/C compressor clutch components and/or assembly. Remove, inspect, and reinstall A/C compressor and mountings; determine required oil quantity. Identify hybrid vehicle A/C system electrical circuits, service and safety precautions. AHTA10.11.05.13 Determine need for an additional A/C system filter. AHTA10.11.05.14 Remove and inspect A/C system mufflers, hoses, lines, fittings, O-rings, seals, and service valves. AHTA10.11.05.15 Inspect A/C condenser for airflow restrictions. AHTA10.11.05.16 Remove, inspect, and reinstall receiver/drier or accumulator/drier; determine AHTA10.11.05.17 required oil quantity. AHTA10.11.05.18 Remove and install expansion valve or orifice (expansion) tube. AHTA10.11.05.19 Inspect evaporator housing water drain. AHTA10.11.05.20 AHTA10.11.05.21 AHTA10.11.05.22 Remove, inspect, and reinstall evaporator; determine required oil quantity. Remove, inspect, and reinstall condenser; determine required oil quantity. Diagnose temperature control problems in the heater/ventilation system. AHTA10.11.05.23 Remove, inspect, and reinstall heater core. Page 11 of 16
AHTA10.11.05.24 Diagnose malfunctions in the vacuum, mechanical, and electrical components and controls of the heating, ventilation, and A/C (HVAC) system. AHTA10.11.05.25 Inspect and test A/C-heater control panel assembly. AHTA10.11.05.26 AHTA10.11.05.27 AHTA10.11.05.28 AHTA10.11.05.29 AHTA10.11.05.30 Inspect and test NC-heater control cables, motors, and linkages. Inspect A/C-heater ducts, doors, hoses, cabin filters and outlets. Check operation of automatic and semi-automatic heating, ventilation, and air-conditioning (HVAC) control systems. Perform correct use and maintenance of refrigerant handling equipment. Identify (by label application or use of a refrigerant identifier) and recover A/C system refrigerant. AHTA10.11.05.31 Recycle refrigerant. AHTA10.11.05.32 Label and store refrigerant. AHTA10.11.05.33 Test recycled refrigerant for non-condensable gases. AHTA10.11.05.34 Evacuate and charge A/C system. AHTA12.04 Perform specialized skills and determine necessary actions needed in the automatic transmission area of automotive service and repair. AHTA12.04.05.01 AHTA12.04.05.02 AHTA12.04.05.03 AHTA12.04.05.04 Performance : Disassemble, clean, and inspect transmission/transaxle. Inspect, measure, clean, and replace valve body (includes surfaces, bores, springs, valves, sleeves, retainers, brackets, check-balls, screens, spacers, and gaskets). Inspect servo bore, piston, seals, pin, spring, and retainers. Inspect accumulator bore, piston, seals, spring, and retainer. AHTA12.04.05.05 Assemble transmission/transaxle. AHTA12.04.05.06 Inspect, leak test, and flush cooler, lines, and fittings. AHTA12.04.05.07 Inspect converter flex plate, attaching parts, pilot, pump drive, and seal areas. Page 12 of 16
AHTA12.04.05.08 AHTA12.04.05.09 Measure torque converter endplay and check for interference; check clutch. Inspect, measure, and reseal oil pump assembly and components. AHTA12.04.05.10 Measure endplay or preload. AHTA12.04.05.11 AHTA12.04.05.12 Inspect, measure, and replace thrust washers and bearings. Inspect oil delivery seal rings, ring grooves, and sealing surface areas. AHTA12.04.05.13 Inspect bushings. AHTA12.04.05.14 AHTA12.04.05.15 AHTA12.04.05.16 AHTA12.04.05.17 AHTA12.04.05.18 AHTA12.04.05.19 Inspect and measure planetary gear assembly (includes sun, ring gear, thrust washers, planetary gears, and carrier assembly). Inspect case bores, passages, bushings, vents, and mating surfaces. Inspect transaxle drive, link chains, sprockets, gears, bearings, and bushings. Inspect, measure, repair, adjust or replace transaxle final drive components. Inspect and reinstall parking pawl, shaft, spring, and retainer. Inspect clutch drum, piston, check-balls, springs, retainers, seals, and friction and pressure plates. AHTA12.04.05.20 Measure clutch pack clearance. AHTA12.04.05.21 Inspect roller and sprag clutch, races, rollers, sprags, springs, cages, and retainers. AHTA12.04.05.22 Inspect bands and drums. AHTA12.05 Perform specialized skills and determine necessary actions needed in the manual drive train and axles area of automotive service and repair. AHTA12.05.05.01 AHTA12.05.05.02 Performance : Inspect and replace clutch pressure plate assembly and clutch disc. Inspect, remove or replace pilot bearing or bushing (as applicable). AHTA12.05.05.03 Inspect flywheel and ring gear for wear and cracks. Page 13 of 16
AHTA12.05.05.04 Measure flywheel runout and crankshaft endplay. AHTA12.05.05.05 AHTA12.05.05.06 Inspect, adjust, and reinstall shift linkages, brackets, bushings, cables, pivots, and levers. Inspect and replace gaskets, seals, and sealants; inspect sealing surfaces. AHTA12.05.05.07 Remove and replace transaxle final drive. AHTA12.05.05.08 AHTA12.05.05.09 AHTA12.05.05.10 AHTA12.05.05.11 AHTA12.05.05.12 Inspect, adjust, and reinstall shift cover, forks, levers, grommets, shafts, sleeves, detent mechanism, interlocks, and springs. Measure endplay or preload (shim or spacer selection procedure) on Transmission/transaxle shafts. Inspect and reinstall synchronizer hub, sleeve, keys (inserts), springs, and blocking rings. Inspect and reinstall speedometer drive gear, driven gear, vehicle speed sensor (VSS), and retainers. Remove, inspect, measure, adjust, and reinstall transaxle final drive pinion gears (spiders), shaft, side gears, side bearings, thrust washers, and case assembly. AHTA12.05.05.13 Inspect lubrication devices (oil pump or slingers). AHTA12.05.05.14 Disassemble, service, and reassemble transfer case and components. AHTA12.10 Perform specialized skills and determine necessary actions needed in the engine repair area of automotive service and repair. AHTA12.10.05.01 AHTA12.10.05.02 AHTA12.10.05.03 AHTA12.10.05.04 AHTA12.10.05.05 Performance : Remove and reinstall cylinder heads and gaskets; tighten according to manufacturer's specifications and procedures. Visually inspect cylinder head(s) for cracks; check gasket surface areas for warpage and leakage; check passage condition. Inspect valve springs for squareness and free height comparison. Replace valve stem seals on an assembled engine; inspect valve spring retainers, locks, and valve grooves. Inspect valve guides for wear; check valve stem-toguide clearance. Page 14 of 16
AHTA12.10.05.06 Inspect valves and valve seats. AHTA12.10.05.07 AHTA12.10.05.08 AHTA12.10.05.09 Check valve face-to-seat contact and valve seat concentricity (runout). Check valve spring assembled height and valve stem height. Inspect pushrods, rocker arms, rocker arm pivots and shafts for wear, bending, cracks, looseness, and blocked oil passages (orifices). AHTA12.10.05.10 Inspect hydraulic or mechanical lifters. AHTA12.10.05.11 AHTA12.10.05.12 AHTA12.10.05.13 AHTA12.10.05.14 AHTA12.10.05.15 AHTA12.10.05.16 Inspect camshaft drives (including gear wear and backlash, sprocket and chain wear). Inspect camshaft for runout, journal wear and lobe wear. Inspect camshaft bearing surface for wear, damage, out-of-round, and alignment. Disassemble engine block; clean and prepare components for inspection and reassembly. Inspect engine block for visible cracks, passage condition, core and gallery plug condition, and surface warpage. Inspect and measure cylinder walls/sleeves for damage, wear, and ridges. AHTA12.10.05.17 Deglaze and clean cylinder walls. AHTA12.10.05.18 AHTA12.10.05.19 AHTA12.10.05.20 AHTA12.10.05.21 Inspect and measure camshaft bearings for wear, damage, out-of-round, and alignment. 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. Inspect main and connecting rod bearings for damage and wear. Identify piston and bearing wear patterns that indicate connecting rod alignment and main bearing bore problems. AHTA12.10.05.22 Inspect and measure pistons. AHTA12.10.05.23 Remove and replace piston pin. AHTA12.10.05.24 Inspect, measure, and install piston rings. Page 15 of 16
AHTA12.10.05.25 AHTA12.10.05.26 Inspect auxiliary (balance, intermediate, idler, counterbalance or silencer) shaft(s); inspect shaft(s) and support bearings for damage and wear; reinstall and time. Inspect or replace crankshaft vibration damper (harmonic balancer). AHTA12.10.05.27 Assemble engine block assembly. Page 16 of 16