Application
This unit describes the performance outcomes required to diagnose and repair faults in the spark ignition engines and compression ignition engines of light vehicles. It involves preparing for the task, selecting the correct diagnostic procedure, carrying out the diagnosis and the repair, performing post-repair testing, and completing workplace processes and documentation.
It applies to those working in the automotive service and repair industry. The engines include those in light vehicles or light commercial vehicles.
No licensing, legislative, regulatory or certification requirements apply to this unit at the time of publication.
Elements and Performance Criteria
Elements Elements describe the essential outcomes. | Performance Criteria Performance criteria describe the performance needed to demonstrate achievement of the element. Where bold and italicised text is used, further information is detailed in the range of conditions section. |
1. Prepare to diagnose and repair light vehicle engine | 1.1 Job requirements are determined from workplace instructions 1.2 Diagnostic information is sourced and interpreted 1.3 Diagnostic options are analysed and those most appropriate to the circumstances are selected 1.4 Hazards associated with the work are identified and risks are managed 1.5 Diagnostic tools and equipment are selected and checked for serviceability |
2. Diagnose engine | 2.1 Diagnostic tests are performed according to workplace procedures and safety requirements 2.2 Faults are identified from diagnostic test results and causes of faults are determined 2.3 Diagnosis findings are reported according to workplace procedures, including recommendations for necessary repairs or adjustments |
3. Dismantle engine | 3.1 Tools, equipment and materials are selected and checked 3.2 Engine is dismantled as required according to workplace procedures, and safety and environmental requirements 3.3 Engine is cleaned and components arranged for inspection according to workplace procedures, and safety and environmental requirements 3.4 Engine components are measured and compared against manufacturer specifications 3.5 Final repair recommendations are made and reported according to workplace procedures |
4. Repair and reassemble engine | 4.1 Repair information is sourced and interpreted 4.2 Repair options are analysed and those most appropriate to the circumstances are selected 4.3 Repairs and component replacements and adjustments are carried out according to manufacturer specifications, workplace procedures, and safety and environmental requirements, and without causing damage to components or system 4.4 Engine is reassembled according to manufacturer specifications, workplace procedures and safety requirements 4.5 Post-repair testing is carried out according to workplace procedures to confirm fault rectification, and any further problems detected as having been introduced during the repair process are rectified |
5. Complete work processes | 5.1 Final inspection is made to ensure work is to workplace expectations and engine is presented ready for use or stored according to workplace procedures 5.2 Work area is cleaned, waste and non-recyclable materials are disposed of, and recyclable material is collected 5.3 Tools and equipment are checked and stored according to workplace procedures 5.4 Workplace documentation is processed according to workplace procedures |
Evidence of Performance
Before competency can be determined, individuals must demonstrate they can perform the following according to the standards defined in this unit’s elements, performance criteria, range of conditions and foundation skills:
diagnose and repair the following faults in three different light vehicle engines:
a fault in an engine cylinder head with an overhead camshaft, in which the work must involve removing the cylinder head from the engine
a fault in two of the following components, in which the work must involve removing the components from the engine:
engine valve timing belt
engine valve timing chain
engine valve lifters
cylinder head valve stem seals
camshaft
camshaft bearings
crankshaft
balance shaft or its bearings
pistons and connecting rods
cylinder block sleeves
main bearings and big-end bearings
internal oil pump
dismantle and reassemble one of the above engines.
Evidence of Knowledge
Individuals must be able to demonstrate knowledge of:
work health and safety (WHS) and occupational health and safety (OHS) requirements relating to diagnosing and repairing light vehicle engines, including procedures for lifting and supporting light vehicle engines
environmental requirements, including procedures for trapping, storing and disposing of fluids released from engines
operating principles of light vehicle engines and associated components, including:
combustion, including:
air-fuel ratios and combustion cycles
direct injection
detonation
engine design, including:
swept volume and engine volume
compression ratio
engine efficiency, including volumetric efficiency, thermal efficiency and mechanical efficiency
torque and horsepower, including brake horsepower
application, purpose and operation of the following components of light vehicle engines and components, including:
lubrication systems, cylinder blocks, cylinders, pistons, cylinder heads, combustion chambers, inlet and exhaust manifolds, connecting rods, crankshafts, piston rings, gudgeon pins, camshafts, timing gears, vibration dampers and flywheels
diagnostic testing procedures for light vehicle engines, including:
wet and dry compression tests
cylinder leakage tests
oil pressure tests
checking sources of fluid leaks
exhaust smoke diagnosis
checking abnormal engine noises
dismantling procedures for light vehicle engines, including procedures for:
measuring clearances and tolerances
inspecting components
repair procedures for removing, replacing and adjusting light vehicle engines
assembly procedures for light vehicle engines, including procedures for removing, replacing and adjusting them
post-repair testing procedures for light vehicle engines, including:
checking oil pressure
road testing under load
checking for fluid leaks.
Assessment Conditions
Assessors must satisfy NVR/AQTF assessor requirements.
Competency is to be assessed in the workplace or a simulated environment that accurately reflects performance in a real workplace setting.
Assessment must include direct observation of tasks.
Where assessment of competency includes third-party evidence, individuals must provide evidence that links them to the light vehicle engines that they have worked on, e.g. repair orders.
Assessors must verify performance evidence through questioning on skills and knowledge to ensure correct interpretation and application.
The following resources must be made available:
automotive repair workplace or simulated workplace
workplace instructions
manufacturer engine specifications
three different light vehicle engines with faults specified in the performance evidence
diagnostic equipment for light vehicle engines
tools, equipment and materials appropriate for repairing light vehicle engines.
Foundation Skills
This section describes those language, literacy, numeracy and employment skills that are essential to performance and are not explicit in the performance criteria.
Skills | Description |
Learning skills to: | locate appropriate sources of information efficiently. |
Reading skills to: | interpret information from manufacturer and workshop literature when seeking engine specifications and procedures. |
Writing skills to: | legibly and accurately fill out workplace documentation when reporting diagnostic findings, making repair recommendations, and recording parts and material used. |
Oral communication skills to: | clarify instructions report diagnostic findings and make repair recommendations. |
Numeracy skills to: | measure engine components and use basic mathematical operations, including addition, subtraction and multiplication, to calculate distances, areas, volumes, tolerances and deviations from manufacturer specifications. |
Planning and organising skills to: | plan own work requirements and prioritise actions to achieve required outcomes and ensure tasks are completed within workplace timeframes. |
Technology skills to: | use precision measuring equipment, such as micrometers and dial bore gauges. |
Range Statement
This section specifies work environments and conditions that may affect performance. Essential operating conditions that may be present (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) are included. Bold italicised wording, if used in the performance criteria, is detailed below.
Safety requirements must include: | work health and safety (WHS) and occupational health and safety (OHS) requirements, including procedures for lifting and supporting light vehicle engines. |
Environmental requirements must include: | procedures for trapping, storing and disposing of fluids released from engines. |
Sectors
Technical - Engines
Competency Field
Mechanical - Light Vehicle