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Elements and Performance Criteria

1. Identify resources
   • Sources of information are located to assist with understanding petrol and diesel engine system operation and performance
   • Relevance of information to engine type, and system operation and performance is confirmed
2. Apply knowledge of engine operation
   • Understanding of the operating principles of petrol and diesel engine operation is developed
   • Knowledge of engine components, their function and operation in a petrol and diesel engine is applied
   • Knowledge of the relationship that a four-stroke cycle petrol and diesel engine has with the vehicle’s ignition, starting, air and fuel delivery and cooling system is applied
3. Apply fault identification to engine performance
   • Components of petrol and diesel engines are identified
   • Engine principles are applied to vehicle inspection and service activities
   • Basic fault-finding procedures are performed on petrol and diesel engines

Required Skills

Required skills

communication skills to communicate ideas and information relating to petrol and diesel engine terminology and procedures verbal and written clarify workplace instructions and determine job requirements apply questioning and active listening skills to obtain factual information from sources initiative and enterprise skills to recognise a workplace problem or potential problem and take action learning skills to identify sources of information assistance and expert knowledge to expand skills knowledge and understanding literacy skills to understand technical information relating to engine operation read and follow information in written instructions specifications and other reference documents problemsolving skills to refer problems outside area of responsibility to appropriate person use and communicate basic mathematical ideas and techniques that relate to automotive systems and components selfmanagement skills to recognise limitations and seek timely advice follow workplace documentation such as workplace safe operating procedures technical skills to collect organise and understand technical information relating to recognising and reporting unsafe situations petrol and diesel engine component and system identification location and function collect organise and apply knowledge of information and concepts relating to petrol and diesel engine operation technology skills to use information technology equipment to assist with research

Required knowledge

classifications of engines including internal combustion reciprocating and rotary engines spark ignition and compression ignition engines engine cylinder arrangements engine configurations including inline engines veetype engines and slant cylinder engines opposed cylinder engines camshaft and valve locations including overhead cam OHC overhead valve OHV engine operating principles including twostroke cycles fourstroke cycles combustion including airfuel ratios and flame propagation direct and indirect fuel injection detonation and preignition engine measurement and performance including bore and stroke swept volume and engine volume compression ratio engine efficiency torque and horsepower including brake horsepower operation of petrol engines including engine components including cylinder blocks cylinders pistons cylinder heads combustion chambers inlet and exhaust manifolds spark plugs connecting rods crankshafts piston rings gudgeon pins camshafts cams and flywheels operation of diesel engines including direct and indirect injection swirl chambers precombustion chambers

Evidence Required

The evidence guide provides advice on assessment and must be read in conjunction with the Performance Criteria required Skills and Knowledge the Range Statement and the Assessment Guidelines for the Training Package
Overview of assessment
Critical aspects for assessment and evidence required to demonstrate competency in this unit	The evidence required to demonstrate competency in this unit must be relevant to workplace operations and satisfy all of the requirements of the performance criteria and required skills and knowledge A person who demonstrates competency in this unit must be able to apply and demonstrate knowledge of location of relevant sources of information on petrol and diesel engine components systems and principles of operation operating principles of petrol and diesel engine systems and components various engine types and layouts in petrol and diesel powered vehicles relationship that a fourstroke cycle petrol and diesel engine has with the vehicles ignition starting air and fuel delivery and cooling systems
Context of and specific resources for assessment	Competency is to be assessed in the workplace or a simulated workplace environment that accurately reflects performance in a real workplace setting Assessment is to occur using standard workplace practices and procedures following safety requirements applying environmental constraints Assessment is to comply with relevant regulatory requirements Australian standards industry codes of practice The following resources must be made available for the assessment of this unit technical reference library with various information resources a range of engine components systems and assemblies a range of petrol and diesel engine types and configurations mounted on an engine stand for ease of viewing functioning light vehicle or vehicles automotive tools and test equipment personal protective equipment and workplace safety equipment
Method of assessment	Assessment must satisfy the endorsed Assessment Guidelines of this Training Package Assessment methods must confirm consistency and accuracy of performance over time and in a range of workplace relevant contexts together with the application of required skills and knowledge Assessment methods must be by direct observation of tasks and include questioning on required skills and knowledge to ensure correct interpretation and application Competence in this unit may be assessed in conjunction with other units which together form part of a holistic work role Where applicable reasonable adjustment must be made to work environments and training situations to accommodate the needs of diverse clients Assessment processes and techniques must be culturally sensitive and appropriate to the language literacy and numeracy capacity of the candidate and the work being performed

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Range Statement

The range statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicised wording, in the performance criteria, is detailed below. Essential operating conditions that may be present with training and assessment (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) may also be included.
Sources of informationmay include:	workplace service information automotive engine mechanical texts vehicle workshop manuals service bulletins magazine technical articles.
Petrol and diesel engine operation may include:	engine construction engine types and configuration two-stroke and four-stroke cycles of engine operation, including: intake stroke compression stroke power stroke exhaust stroke firing order ignition types, including: spark compression engine mounting location, including: front longitudinal front transverse mid transverse measurement and performance, including: bore and stroke displacement compression ratio engine efficiency torque versus horsepower.
Engine componentsmay include:	top of engine, including: timing belt or chain camshaft timing pulley camshaft single and dual rocker arms and shafts intake valves and springs exhaust valves and springs cylinder head front of engine, including: crankshaft crankshaft timing pulley crankshaft pulley and balancer rear of engine, including: flywheel starter ring gear bottom of engine, including: engine block crankshaft crankshaft balance weights crankshaft main bearing journals pistons connecting rods.
Relationships may include:	ignition system: ignition timing top dead centre (TDC) electrical sensors spark plugs glow plugs fuel injectors knock sensors starter motor system charging system coolant temperature sensor air intake fuel delivery exhaust emission engine oil lubrication system.

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