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Elements and Performance Criteria

1. Prepare to diagnose and repair outdoor power equipment 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 carried out according to manufacturer specifications, workplace procedures, and environmental and safety requirements
   • Faults are identified from diagnostic test results and causes of faults are determined
   • Diagnosis findings, including recommendations for necessary repairs or adjustments, are reported according to workplace procedures
   • Obtain authorisation to proceed according to workplace procedures
3. Repair engine
   • Repair information is sourced and interpreted
   • Repair options are analysed and those most appropriate to the circumstances are selected
   • Repair tools, equipment and materials are selected and prepared
   • 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 systems
   • 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
4. Complete work processes
   • Final inspection is made to ensure work is to workplace expectations and engine is presented ready for use, including protective guards, cowlings and safety features
   • 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
5. Prepare to diagnose and repair outdoor power equipment 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
6. Diagnose engine
   • Diagnostic tests are carried out according to manufacturer specifications, workplace procedures, and environmental and safety requirements
   • Faults are identified from diagnostic test results and causes of faults are determined
   • Diagnosis findings, including recommendations for necessary repairs or adjustments, are reported according to workplace procedures
   • Obtain authorisation to proceed according to workplace procedures
7. Repair engine
   • Repair information is sourced and interpreted
   • Repair options are analysed and those most appropriate to the circumstances are selected
   • Repair tools, equipment and materials are selected and prepared
   • 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 systems
   • 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
8. Complete work processes
   • Final inspection is made to ensure work is to workplace expectations and engine is presented ready for use, including protective guards, cowlings and safety features
   • 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 working with rotating and hot components.
Repair information must include procedures for:	dismantling and reassembling engines repairing and replacing faulty or worn engine components testing and adjusting engine components.
Environmental requirements must include:	procedures for trapping, storing and disposing of lubricants and fluids released from outdoor power equipment engines.
Post-repair testing must include:	starting and running up engine to operating temperature and checking against manufacturer specifications, workplace procedures, and safety and environmental requirements making final adjustments and re-testing as required.

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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 a fault in two different outdoor power equipment engines, including in two of the following engine types:

two-stroke spark ignition engine

four-stroke spark ignition engine

four-stroke compression ignition engine

in working on the above engines, removing, refitting or replacing the:

cylinder head

camshaft

piston and connecting rod

crankshaft.

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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 outdoor power equipment engines, including procedures for working with rotating and hot components

environmental requirements, including procedures for trapping, storing and disposing of lubricants and fluids released from outdoor power equipment engines

operating principles of the outdoor power equipment engines and associated components, including:

two and four-stroke spark ignition engines and four-stroke compression ignition engines, including:

combustion cycle

swept volume and engine volume

compression ratio

valve timing

engine efficiency, including volumetric efficiency, thermal efficiency and mechanical efficiency

torque and horsepower, including brake horsepower

engine measurement and performance, including:

swept volume and engine volume

compression ratio

valve timing

engine efficiency, including volumetric efficiency, thermal efficiency and mechanical efficiency

types of lubricants, and associated application and methods of lubrication

application, purpose and operation of outdoor power equipment engines and components, including:

lubrication system, cylinder blocks, cylinders, pistons, cylinder heads, combustion chambers, inlet and exhaust manifolds, connecting rods, crankshafts, pistons, piston rings, gudgeon pins, camshafts, timing gears, vibration dampers and flywheels

diagnostic testing procedures for outdoor power equipment engines, including:

engine compression tests

vacuum tests

checking for sources of fluid leak

checking abnormal engine noises

dismantling procedures for outdoor power equipment engines, including procedures for :

measuring clearances and tolerances

inspecting components

repair procedures for outdoor power equipment engines, including procedures for removing and replacing the:

cylinder head

piston and connecting rod

crankshaft

camshaft

assembly procedures for outdoor power equipment engines, including adjusting components

post-repair testing procedures for outdoor power equipment engines, including idle and governor adjustments.

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