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Elements and Performance Criteria

1. Prepare to dismantle outdoor power equipment engine
   • Job requirements are determined from workplace instructions
   • Dismantling information is sourced and interpreted
   • Dismantling options are analysed and those most appropriate to the circumstances are selected
   • Hazards associated with the work are identified and risks are managed
   • Dismantling tools and equipment are selected and checked for serviceability
2. Dismantle and evaluate engine and components
   • Engine and relevant components are dismantled in a logical sequence according to manufacturer and workplace procedures, and safety and environmental requirements, and without causing unnecessary damage to components or systems
   • Components are cleaned ready for evaluation according to workplace procedures and safety and environmental requirements
   • Components are measured and compared with manufacturer specifications and serviceability is determined
   • Component repair method is determined
   • Unserviceable parts are identified and replacement parts sourced
   • Authorisation to proceed is obtained according to workplace procedures
3. Carry out overhaul
   • Overhaul information is sourced and interpreted
   • Overhaul options are analysed and those most appropriate to the circumstances are selected
   • Overhaul tools and equipment are selected and checked for serviceability
   • Components are machined, repaired and replaced as required, and adjustments are carried out according to manufacturer specifications, workplace procedures, and safety and environmental requirements, and without causing damage to components or systems
4. Assemble engine and components
   • Engine is assembled according to manufacturer specifications, workplace procedures, and safety and environmental requirements
   • Tolerances and clearances are measured against manufacturer specifications and necessary adjustments are made
   • Assembly of engine is completed within workplace timeframes and without causing damage to other components or systems
   • Post-assembly testing is carried out according to workplace procedures and safety and environmental requirements, and any problems detected as having been introduced during the assembly 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 storage, 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
6. Prepare to dismantle outdoor power equipment engine
   • Job requirements are determined from workplace instructions
   • Dismantling information is sourced and interpreted
   • Dismantling options are analysed and those most appropriate to the circumstances are selected
   • Hazards associated with the work are identified and risks are managed
   • Dismantling tools and equipment are selected and checked for serviceability
7. Dismantle and evaluate engine and components
   • Engine and relevant components are dismantled in a logical sequence according to manufacturer and workplace procedures, and safety and environmental requirements, and without causing unnecessary damage to components or systems
   • Components are cleaned ready for evaluation according to workplace procedures and safety and environmental requirements
   • Components are measured and compared with manufacturer specifications and serviceability is determined
   • Component repair method is determined
   • Unserviceable parts are identified and replacement parts sourced
   • Authorisation to proceed is obtained according to workplace procedures
8. Carry out overhaul
   • Overhaul information is sourced and interpreted
   • Overhaul options are analysed and those most appropriate to the circumstances are selected
   • Overhaul tools and equipment are selected and checked for serviceability
   • Components are machined, repaired and replaced as required, and adjustments are carried out according to manufacturer specifications, workplace procedures, and safety and environmental requirements, and without causing damage to components or systems
9. Assemble engine and components
   • Engine is assembled according to manufacturer specifications, workplace procedures, and safety and environmental requirements
   • Tolerances and clearances are measured against manufacturer specifications and necessary adjustments are made
   • Assembly of engine is completed within workplace timeframes and without causing damage to other components or systems
   • Post-assembly testing is carried out according to workplace procedures and safety and environmental requirements, and any problems detected as having been introduced during the assembly 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 storage, 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 and environmental requirements must include:

work health and safety (WHS) and occupational health and safety (OHS) requirements, including procedures for: operating specialised engine overhaul tools, equipment and machinery using cleaning chemicals and toxic substances environmental requirements, including procedures for trapping, storing and disposing of lubricants and 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 standard defined in this unit’s elements, performance criteria, range of conditions and foundation skills:

overhaul two different outdoor power equipment engines as follows:

one four-stroke spark ignition engine

one of the following:

two-stroke spark ignition engine

four-stroke compression ignition engine.

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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 overhauling engines and associated engine components, including procedures for:

operating specialised engine overhaul tools, equipment and machinery

using cleaning chemicals and toxic substances

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

types, characteristics and operating principles of outdoor power equipment engines and associated engine components

outdoor power equipment engine overhaul procedures, including:

methods for cleaning and preparing an engine for overhaul

engine dismantling procedures

engine component inspection, measuring and evaluation procedures, including methods for measuring and calculating tolerances and clearances

engine and engine component repair and adjustment procedures, including:

engine cylinder head and cylinder block

engine crankshaft and camshaft

engine cylinder and engine sleeve fitting, boring and honing

engine bearing tunnel and connecting rod repair

engine assembly and adjustment procedures for achieving component tolerances, including:

piston to connecting rod big-end alignment

big-end bearing to crankshaft journal clearance

big-end bearing crush with bearing blue

piston ring end gap, back clearance and side clearance

main bearing to crankshaft journal clearance

cylinder head, valves, guides and seats

camshafts and cam followers

camshaft end float

crankshaft end float

gear backlash

governors

oil pump sealing and pick-up oil piping

component assembly procedures and processes, including:

welsh plugs and oil gallery plugs

piston and connecting rod assemblies

big-end bearings

piston rings to pistons

main bearings and thrust washers

crankshafts, including protection measures for crankshaft journals, bearings, rings and bores

finished camshaft bearings

cylinder head and components

camshafts and cam followers

timing gears

oil pumps, oil squirters, oil splashers, and oil pump pick-ups

governors

balance shafts

fitting ancillary components, including covers and cowlings, seals, housings, crankshaft pulleys and flywheels

post-overhaul testing procedures for engines, including:

fuel system adjustments

governor speed adjustments

engine protection devices.

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