Elements describe the essential outcomes.

Performance criteria describe the performance needed to demonstrate achievement of the element.

1 

Outline stages of combustion in two-stroke and four-stroke cycle diesel engines 

1.1

Two-stroke and four-stroke cycle diesel engines are compared and contrasted

1.2

Methods and diagnostic information used in determining engine combustion characteristics are specified

1.3

Diagnostic information is used to identify and interpret common combustion faults and to produce typical diagrams for analysing faults

2 

Explain means of pressure- charging diesel engines 

2.1

Pressure-charging principles and their influence on engine design and waste heat recovery are explained

2.2

Different methods of pressure-charging diesel engines are clarified

2.3

Emergency isolation procedures used when pressure-charging diesel engines are clarified

3 

Explain operation of diesel engine governors 

3.1

Governing principles, common governor types and related controls are outlined

3.2

Different requirements for governing diesel engines for propulsion and power generation are explained

3.3

Problems of mismatched engine sizes/prime mover types when sharing common loads are outlined

4 

Explain properties of materials used in construction of engine components 

4.1

Properties of materials used in construction of engine components are specified

4.2

Dynamic stresses and loads, materials and service limitations of engine components are outlined

4.3

Construction and operating cycle forces of diesel engine components are outlined

4.4

Relationship between critical speed, use of detuners/dampers and materials in engine components is clarified

5 

Explain safe working practices associated with diesel engines during maintenance, repair and operation 

5.1

Safe practices for isolating propulsion and power generation diesel engines prior to work commencement are confirmed

5.2

Safety protective clothing to be used during all aspects of diesel maintenance is identified

5.3

Hazards associated with working on diesel engines and systems including working in enclosed spaces are identified

5.4

Correct procedures for using hydraulic tools and high-pressure fuel injection test equipment are clarified

5.5

Purpose, operation and maintenance of safety interlocks and protective cut-outs of engine manoeuvring systems is determined

6 

Explain procedures for preventing and responding to crankcase and airline explosions, and scavenge and uptake fires 

6.1

Causes, symptoms and means of preventing and extinguishing uptake and economiser fires are outlined

6.2

Risks of continued service with an isolated waste heat unit are assessed

6.3

Causes, symptoms, methods of extinguishing and prevention of scavenge fires are evaluated

6.4

Causes and hazards associated with starting airline explosions are identified

6.5

Protective devices fitted to air starting systems to minimise risk of explosion, and routine inspection and maintenance required are detailed

6.6

Causes and ways of preventing crankcase explosions in both diesel and dual-fuel engines are outlined

6.7

Procedure to be taken in the event of an early warning of a hazardous crankcase atmosphere and required procedure to be followed after engine has stopped are clarified

This section describes those language, literacy, numeracy and employment skills that are essential to performance.

Foundation skills essential to performance are explicit in the performance criteria of this unit of competency.

Specifies different 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.

Range is restricted to essential operating conditions and any other variables essential to the work environment.

Diagnostic information includes one or more of the following:

• engine efficiency
• fuel consumption
• temperature

Common combustion faults include one or more of the following:

• engine cylinder fuel supply
• lack of total combustion

Methods of pressure-charging diesel engines include one or more of the following:

• exhaust gas turbo charging
• positive displacement engine-driven blowers
• under-piston assistance

Diesel engine components include one or more of the following:

• bedplates
• camshafts
• crankshafts
• cross-heads
• cylinder heads
• exhaust valves
• frames
• fuel injectors
• fuel pumps
• liners
• pistons
• tie-rods for two- or four-stroke engines
• turbochargers
• valves and rocket gear

Hazards include one or more of the following:

• acids
• chemicals
• defective or bypassed machinery protective devices
• defective or inappropriately adjusted exhaust systems
• enclosed spaces
• flammable liquids under pressure
• hydrocarbons
• lifting heavy components both unaided and with lifting gear
• leaking oil and fuel

Causes include one or more of the following:

• airlock in feed water system
• cleanliness of economiser tubes
• failure of economiser feed pump
• loss of feed-water supply