May 20, 2022
ATG 333 - Major Service Proc/GM Engines Credits: 3
Lecture Hours: 2
Lab Hours: 2
Practicum Hours: 0
Work Experience: 0
Course Type: Voc/Tech
This course is designed to provide instruction in proper diagnosis of GM engine malfunctions and repair or replacement of defective components and assemblies. Emphasis will be placed on in-vehicle engine service and repair as well as engine removal and reinstallation operations performed in GM dealerships.
Prerequisite: Admission to Automotive Service Educational Program and ATG 327
- Practice safe working habits.
- Use proper eye protection.
- Select proper tools to work in a safe manner.
- Demonstrate a concern for the safety of fellow workers.
- Evaluate engine performance.
- Evaluate engine performance during a road test.
- Perform cylinder power balance test; determine necessary action.
- Perform engine absolute (vacuum/boost) manifold pressure tests; determine necessary action.
- Perform cylinder cracking compression tests; determine necessary action.
- Perform cylinder leakage test; determine necessary action.
- Perform cylinder running compression test; determine necessary action.
- Analyze engine fluid leaks.
- Diagnose abnormal engine noises or vibration concerns; determine necessary actions.
- Diagnose the cause of excessive oil consumption, coolant consumption, unusual exhaust color, odor, and sound; determine necessary action.
- Service cooling system.
- Discuss types of coolant.
- Identify causes of engine overheating.
- Inspect, replace, and adjust drive belts, tensioners, and pulleys; check pulley and belt alignment.
- Inspect and test coolant; drain and recover coolant; flush and refill cooling system with recommended coolant; bleed as required.
- Perform cooling system pressure and dye tests to identify leaks; Inspect and test radiator, pressure cap, coolant recovery tank, heater core and radiator hoses; determine necessary action.
- Inspect, remove, and replace water pump.
- Remove and replace radiator.
- Remove, inspect and replace thermostat and gasket/seal.
- Inspect and test cooling fans (electrical and mechanical), fan clutch, and fan shrouds and air dams.
- Inspect, test, and replace coolant temperature and pressure switches and sensors.
- Service engine lubrication system.
- Explain engine oil classifications and categories.
- Perform engine oil pressure test; determine necessary action.
- Inspect, test, and replace oil temperature and pressure switches and sensors.
- Engine assembly removal and reinstallation.
- Inspect engine assembly for fuel, oil, coolant, and other leaks; determine necessary action.
- Remove and reinstall engine assembly in and OBD II or newer vehicle; reconnect all attaching components and restore vehicle to running condition.
- Perform predetermined operations; clean engine components, inspect components for wear, and perform any necessary measurements; determine any necessary operations to restore engine to manufacturer’s recommendations.
- Verify operation of the instrument panel warning indicators.
- Perform in-vehicle service.
- 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.
- Replace valve stem seals on an assembled engine; inspect valve spring retainers, locks/keepers, and valve lock/keeper grooves; determine necessary action.
- Adjust valves (mechanical or hydraulic lifters).
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