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Elements and Performance Criteria

1. Prepare to diagnose and repair light vehicle engine
   • Job requirements are determined from workplace instructions
   • Diagnostic information is sourced and interpreted
   • Diagnostic options are analysed and those most appropriate to the circumstances are selected
   • Hazards associated with the work are identified and risks are managed
   • Diagnostic tools and equipment are selected and checked for serviceability
2. Diagnose engine
   • Diagnostic tests are performed according to workplace procedures and safety requirements
   • Faults are identified from diagnostic test results and causes of faults are determined
   • Diagnosis findings are reported according to workplace procedures, including recommendations for necessary repairs or adjustments
3. Dismantle engine
   • Tools, equipment and materials are selected and checked
   • Engine is dismantled as required according to workplace procedures, and safety and environmental requirements
   • Engine is cleaned and components arranged for inspection according to workplace procedures, and safety and environmental requirements
   • Engine components are measured and compared against manufacturer specifications
   • Final repair recommendations are made and reported according to workplace procedures
4. Repair and reassemble engine
   • Repair information is sourced and interpreted
   • Repair options are analysed and those most appropriate to the circumstances are selected
   • 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
   • Engine is reassembled according to manufacturer specifications, workplace procedures and safety requirements
   • 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
   • Final inspection is made to ensure work is to workplace expectations and engine is presented ready for use or stored according to workplace procedures
   • Work area is cleaned, waste and non-recyclable materials are disposed of, and recyclable material is collected
   • Tools and equipment are checked and stored according to workplace procedures
   • Workplace documentation is processed according to workplace procedures
6. Prepare to diagnose and repair light vehicle engine
   • Job requirements are determined from workplace instructions
   • Diagnostic information is sourced and interpreted
   • Diagnostic options are analysed and those most appropriate to the circumstances are selected
   • Hazards associated with the work are identified and risks are managed
   • Diagnostic tools and equipment are selected and checked for serviceability
7. Diagnose engine
   • Diagnostic tests are performed according to workplace procedures and safety requirements
   • Faults are identified from diagnostic test results and causes of faults are determined
   • Diagnosis findings are reported according to workplace procedures, including recommendations for necessary repairs or adjustments
8. Dismantle engine
   • Tools, equipment and materials are selected and checked
   • Engine is dismantled as required according to workplace procedures, and safety and environmental requirements
   • Engine is cleaned and components arranged for inspection according to workplace procedures, and safety and environmental requirements
   • Engine components are measured and compared against manufacturer specifications
   • Final repair recommendations are made and reported according to workplace procedures
9. Repair and reassemble engine
   • Repair information is sourced and interpreted
   • Repair options are analysed and those most appropriate to the circumstances are selected
   • 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
   • Engine is reassembled according to manufacturer specifications, workplace procedures and safety requirements
   • 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
10. Complete work processes
    • Final inspection is made to ensure work is to workplace expectations and engine is presented ready for use or stored according to workplace procedures
    • Work area is cleaned, waste and non-recyclable materials are disposed of, and recyclable material is collected
    • Tools and equipment are checked and stored according to workplace procedures
    • Workplace documentation is processed according to workplace procedures

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.

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Performance Evidence

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.

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Knowledge Evidence

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.

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