Unit of competency Outline

Date retreived
22/07/2026 8:15 AM 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
AURTTM002
State Code
AXA46
TGA Status
Current
DTWD Status
Approved
Current Release Number
1.00
Current Release Date
14/04/2016
View on TGA
State Implementation and Classification
Approved Date
13/07/2016
Field of Education
030503 - Vehicle Mechanics
Original Release Date
13/07/2016
Nominal Hours
40
Description
This unit describes the performance outcomes required to repair bearing tunnels and connecting rods in engines. It involves preparing for the task, line boring and honing engine bearing tunnels, repairing connecting rods to specifications and workplace requirements in an engine reconditioning process, and completing workplace processes and documentation.It applies to those working in the automotive service and repair industry. The engine components include those in vehicles from all sectors of the industry.No licensing, legislative, regulatory or certification requirements apply to this unit at the time of publication.
Notes
Elements and Performance Criteria
1. Determine line boring requirements
  • 1.1 Job requirements are determined from workplace instructions
  • 1.2 Engine block is cleaned and main bearing bolt holes are crack tested according to workplace procedures and safety requirements
  • 1.3 Information is sourced and repair options are analysed and those most appropriate to the circumstances are selected
  • 1.4 Required tools and measuring equipment are checked and prepared for operation according to manufacturer specifications and workplace procedures
  • 1.5 Hazards associated with the work are identified and risks are managed
2. Prepare engine and line boring machine
  • 2.1 Engine is measured and calibration requirements for line boring are determined
  • 2.2 Engine block or cylinder head is prepared for line boring according to workplace procedures and safety and environmental requirements
  • 2.3 Line boring machine is prepared to accept cylinder engine block or cylinder head according to manufacturer specifications and workplace procedures
  • 2.4 Engine block or cylinder head is positioned and clamped according to manufacturer specifications and workplace procedures
3. Line bore engine bearing tunnels
  • 3.1 Tool is set and locked and a test cut is taken according to workplace procedures and safety requirements, and following machinery safe operating procedures
  • 3.2 Engine tunnels are line bored at correct speeds and feed rates according to workplace procedures and safety requirements, and following machinery safe operating procedures
  • 3.3 Line boring tool sharpness is checked and maintained throughout boring operation according to manufacturer specifications and workplace procedures
  • 3.4 Engine block thrust faces and seal diameter are machined to original size
  • 3.5 Tunnels are measured to ensure compliance with manufacturer specifications
  • 3.6 Line boring operations are completed according to required specifications and honing allowances, workplace procedures and safety requirements, and following machinery safe operating procedures
4. Prepare to hone engine bearing tunnels
  • 4.1 Line-bored engine block or cylinder head is cleaned of residue and swarf according to workplace procedures and safety requirements
  • 4.2 Tools and equipment for honing are selected and checked for serviceability
  • 4.3 Measuring and calibration requirements for honing are determined
  • 4.4 Honing machine is prepared to accept engine block or cylinder head according to manufacturer specifications and workplace procedures
  • 4.5 Engine block or cylinder head is positioned and securely clamped, and required hone stroke is set according to manufacturer specifications and workplace procedures
  • 4.6 Hone stones are selected and speed is set to achieve required finish
5. Hone engine bearing tunnels
  • 5.1 Tunnels are honed at correct speed and rate to required finish according to workplace procedures and safety requirements, and following machinery safe operating procedures
  • 5.2 Components are measured to ensure compliance with manufacturer specifications
  • 5.3 Honing operations are completed to required tunnel to journal clearance according to workplace procedures and safety requirements, and following machinery safe operating procedures
6. Prepare to repair connecting rods
  • 6.1 Connecting rods are cleaned and checked for serviceability according to workplace procedures and safety requirements
  • 6.2 Connecting rods are checked for straightness and straightened as required according to workplace procedures and safety requirements, and following machinery safe operating procedures
  • 6.3 Connecting rod boring machine is prepared to accept connecting rod
  • 6.4 Connecting rod is positioned ready for honing, and securely clamped if machining
7. Repair connecting rod
  • 7.1 Connecting rod little ends and big ends are resized according to workplace procedures and safety requirements, and following machinery safe operating procedures
  • 7.2 Components are measured to ensure compliance with manufacturer specifications
8. Complete repair process
  • 8.1 Engine block or cylinder head is thoroughly cleaned of residual honing oil according to workplace procedures
  • 8.2 Final inspection is made to ensure finished work complies with workplace requirements
  • 8.3 Bright surfaces are treated with rust prevention solution and engine block or cylinder head is prepared for further process or storage according to workplace procedures
  • 8.4 Workplace documentation is processed according to workplace procedures
No information
No information
Replaces
State Code National Code Title Type
WC286 AURTTM3002 Repair bearing tunnels and connecting rods in engines Unit of competency