Application
This unit of competency defines the skills and knowledge required to compression test and tune up the engine.
It applies to tune up procedures and evaluation of engine performance on compression ignition engines.
No licensing, legislative or certification requirements apply to this unit at the time of publication.
Band: A
Unit Weight: 4
Elements and Performance Criteria
Elements describe the essential outcomes. | Performance criteria describe the performance needed to demonstrate achievement of the element. | ||
1 | Determine job requirements | 1.1 | Follow standard operating procedures (SOPs) |
1.2 | Comply with work health and safety (WHS) requirements at all times | ||
1.3 | Use appropriate personal protective equipment (PPE) in accordance with SOPs | ||
1.4 | Identify job requirements from specifications, drawings, job sheets or work instructions | ||
2 | Compression test engine | 2.1 | Remove injectors and isolate fuel system for each cylinder |
2.2 | Select and fit appropriate adaptors | ||
2.3 | Obtain, interpret, record and correct readings for adaptor used | ||
2.4 | Use correct compression readings for adaptor | ||
3 | Perform tune up | 3.1 | Determine firing pressures and adjust to specification, as applicable |
3.2 | Perform air restriction, boost, back pressure and flow tests according to manufacturer recommendations using applicable test equipment | ||
3.3 | Record readings and determine variances from specifications | ||
3.4 | Determine density of exhaust smoke | ||
3.5 | Adjust valve clearance and/or timing to specifications | ||
3.6 | Adjust injection pump or injector timing to specification | ||
3.7 | Adjust engine parameters using methods appropriate to technology of engine | ||
3.8 | Determine if injector opening pressure is within specification and adjust, arrange replacement or repair if faulty | ||
Foundation Skills
This section describes those required skills (reading, writing, oral communication and numeracy) that are essential to workplace performance in this unit of competency.
Foundation skills essential to performance are explicit in the performance criteria of this unit of competency.
Range Statement
This field allows for 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. | |
Engine firing pressure control adjustment methods include the following: | reflashing of electronic control module (ECM) unit where electronic control is used manual adjustment of: governor rack travel torque spring load limit over speed trips aneroid or fuel ratio control to specification |
Competency Field
Fixed and mobile plant