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 four-stroke cycle petrol and diesel engine has with the vehicle’s 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.

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

problem-solving 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

self-management 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, vee-type engines and slant cylinder engines

opposed cylinder engines

camshaft and valve locations, including:

overhead cam (OHC)

overhead valve (OHV)

engine operating principles, including:

two-stroke cycles

four-stroke cycles

combustion, including:

air-fuel ratios and flame propagation

direct and indirect fuel injection

detonation and pre-ignition

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

pre-combustion chambers

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.