Unit of competency Outline

Date retreived
23/07/2026 7:45 PM AWST

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Repair bearing tunnels and connecting rods in engines

Repair bearing tunnels and connecting rods in engines

Unit of competency
National Code
AURTTM3002
State Code
WC286
TGA Status
Replaced
DTWD Status
Replaced
Current Release Number
2.00
Current Release Date
17/01/2013
State Implementation and Classification
Approved Date
02/08/2013
Field of Education
030503 - Vehicle Mechanics
Original Release Date
02/08/2013
Nominal Hours
40
Description
This unit describes the performance outcomes required to repair bearing tunnels and connecting rods in engines. It involves determining the machining process required, selecting the appropriate machine, and performing the machining to specifications and workplace requirements in an engine reconditioning process.No licensing, legislative, regulatory or certification requirements apply to this unit at time of endorsement.
Notes
Elements and Performance Criteria
1. Prepare to line-bore an engine
  • 1.1. Workplace instructions are used to determine job requirements, including method, process and equipment
  • 1.2. Information is sourced, procedures and methods are analysed, and appropriate tooling options are selected for line boring an engine
  • 1.3. Tools and measuring equipment are checked and prepared for operation
  • 1.4. Safe operating procedures and workplace health and safety (WHS) and environmental requirements are observed throughout the work
  • 1.5. Engine is measured and calibration requirements for line boring are determined
  • 1.6. Engine block or cylinder head is prepared for line boring
  • 1.7. Line-boring machine is prepared to accept cylinder engine block or cylinder head
  • 1.8. Engine block or cylinder head is positioned and securely clamped
2. Line-bore tunnels
  • 2.1. Tool is set and locked and a test cut is taken
  • 2.2. Engine tunnels are line bored at correct speeds and feed rates without causing damage to components or system
  • 2.3. Tunnels are checked/measured with instruments to ensure compliance with specifications
  • 2.4. Line-boring operations are completed to required specifications and honing allowances
3. Prepare tunnels for honing operations
  • 3.1. Line-bored engine block or cylinder head is cleaned of residue and swarf, and cleaned using appropriate cleaning materials
  • 3.2. Honing machine is prepared to accept engine block or cylinder head
  • 3.3. Engine block or cylinder head is positioned and securely clamped, and required hone stroke is set
  • 3.4. Hone stones are selected and speed is set to achieve required finish
4. Hone engine tunnels
  • 4.1. Tunnels are honed at correct speed and rate to required finish without causing damage to components or system
  • 4.2. Components are checked/measured with instruments to ensure compliance with specifications
  • 4.3. Honing operations are completed in line with required bore to journal clearance
5. Prepare connecting rods for repair operations
  • 5.1. Connecting rods are checked for straightness and straightened as necessary
  • 5.2. Connecting rod-boring machine is prepared to accept connecting rod
  • 5.3. Connecting rod is positioned ready for honing, and securely clamped if machining
6. Repair connecting rod
  • 6.1. Connecting rod little-ends are resized according to workplace requirements
  • 6.2. Connecting rod big-ends are resized according to workplace requirements
  • 6.3. Connecting rods are repaired without causing damage to components or system
  • 6.4. Components are checked/measured with instruments to ensure compliance with specifications
7. Finalise repair process
  • 7.1. Engine block or cylinder head is thoroughly cleaned of residue honing oil
  • 7.2. Final inspection is made to ensure finished work complies with workplace requirements
  • 7.3. Bright surfaces are treated with a protective coating to prevent rust if engine block or cylinder head is to be stored
  • 7.4. Engine block or cylinder head is prepared for further processing or storage
  • 7.5. Workplace documentation is processed according to workplace procedures
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.
Workplace instructions may include:
computer-generated instructions
verbal instructions
written instructions.
Information may include:
Australian standards
engineer’s design specifications and instructions
instructions issued by authorised workplace or external persons
workplace specifications and requirements
regulatory and legislative requirements relating to the automotive industry, including Australian Design Rules
safe work procedures relating to the operation of machinery associated with repairing bearing tunnels and connecting rods
verbal, written and graphical instructions, signage, work schedules, plans, specifications, work bulletins, memos, material safety data sheets (MSDS), diagrams or sketches.
Appropriate tooling options may include:
grades of tool tips
hand-held and machine-operated hones
types and grades of honing stones
types of boring tools.
Tooling and measuring equipment may include:
arbors
clamps
dial bore gauges
dial indicators
inside and outside micrometers.
WHS requirements may include:
individual state or territory regulatory requirements
operational risk assessment and treatments associated with:
electrical safety
machinery movement and operation
manual and mechanical lifting and shifting
toxic substances
working in proximity to others and site visitors
PPE required by legislation, regulations, codes of practice and workplace policies and procedures.
Environmental requirements include:
clean-up management
dust and noise minimisation
waste management.
Measured and calibrationmay include:
determining sizes of cut and required honing allowances
determining tunnel to journal clearance.
Engine block or cylinder head is prepared may include:
removing main bearings from engine block
machining bearing cap parting faces
fitting bearing caps to required tensions.
Line-boring machine is prepared must include:
clamps
jigs
rails.
Set and locked will include:
setting the tool to the required diameter
locking the tool according to manufacturer specifications.
Speeds and feed rates will include:
those correct for tunnel material and diameter.
Honing allowances will include:
those that are dependent on the speed and feed and nose radius of the boring tool.
Evidence Guide
The evidence guide provides advice on assessment and must be read in conjunction with the performance criteria, required skills and knowledge, 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:
observe safety procedures and requirements
select methods and techniques for repairing bearing tunnels and connecting rods appropriate to the circumstances
complete preparatory activity in a systematic manner
line bore and hone a range of multi-cylinder engines according to workplace, manufacturer and component supplier requirements
repair a range of connecting rods according to workplace, manufacturer and component supplier requirements
complete work without damage to tools and equipment or injury to persons.
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. Performance is demonstrated consistently over a period of time and in a suitable range of contexts.
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:
appropriate worksite
multi-cylinder engine blocks and cylinder heads appropriate to the workplace, including in-line multi-cylinder engine blocks, vee-configuration multi-cylinder engine blocks, and overhead camshaft cylinder heads
fixed and portable hand and power tools and equipment appropriate to line boring and honing engine blocks and cylinder heads
specifications and work instructions.
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 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 its correct interpretation and application.
Assessment must confirm that competency is able not only to be satisfied under the particular circumstance, but is able to be transferred to other circumstances.
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 ethnicity, age, gender, demographics and disability.
Assessment processes and techniques must be culturally sensitive and appropriate to the language and literacy capacity of the candidate and the work being performed.
Replaced By
State Code National Code Title Type
AXA46 AURTTM002 Repair bearing tunnels and connecting rods in engines Unit of competency