24291 version 1
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Demonstrate knowledge of inspecting and machining engine piston and
connecting rod assemblies
Level
3
Credits
6
Purpose
This theory-based unit standard is for people in the automotive machining
industry. People credited with this unit standard are able to demonstrate
knowledge of inspecting and machining piston and connecting rod
assemblies.
Subfield
Motor Industry
Domain
Engines
Status
Registered
Status date
25 January 2008
Date version published
25 January 2008
Planned review date
31 December 2012
Entry information
Open.
Accreditation
Evaluation of documentation and visit by NZQA and
industry.
Standard setting body (SSB)
NZ Motor Industry Training Organisation (Incorporated)
Accreditation and Moderation Action Plan (AMAP) reference
0014
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Special notes
1
Definitions
Machining refers to inspecting, testing, bushing, and machining operations to make
the piston and connecting rod assembly fully and safely operational.
Service information may include but is not limited to – technical information of a
vehicle, machine, or product detailing operation; installation and servicing
procedures; manufacturer instructions and specifications; technical terms and
descriptions; and detailed illustrations. This can be accessed in hard copy or
electronic format and is normally sourced from the manufacturer.
Suitable tools and equipment means industry approved tools and equipment that are
recognised within the industry as being the most suited to complete the task in a
professional and competent manner with due regard to safe working practices.
 New Zealand Qualifications Authority 2016
24291 version 1
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2
Assessment against this standard includes piston and rod assemblies on both petrol
and diesel fuelled multi-cylinder two and four stroke engines.
Elements and performance criteria
Element 1
Demonstrate knowledge of inspecting piston and connecting rod assemblies.
Performance criteria
1.1
Measuring equipment for assessing the piston and connecting rod assembly
condition is described in accordance with service information.
1.2
Procedures to clean and decarbonise piston and rod assemblies are described
in accordance with service information.
Range
1.3
Procedures to inspect pistons, gudgeons, and connecting rods are described in
accordance with service information.
Range
1.4
description includes but is not limited to – cleaning materials,
methods, equipment, personal and environmental safety.
visual inspection, precision measuring, alignment checks.
Crack testing of pistons and connecting rods are described in accordance with
service information.
Range
dye penetrant test, magnetic particle test.
Element 2
Demonstrate knowledge of machining piston and connecting rod assemblies.
Performance criteria
2.1
Suitable tools and equipment used to machine piston and connecting rod
assemblies are described in accordance with service information.
Range
2.2
includes but is not limited to – measuring equipment, cleaning
facilities, boring and honing machines, alignment and straightening
equipment, cleaning brushes, face grinder, lathe, reamers,
regrooving tools, press, depth gauges, drills, drill stand.
Piston machining methods are described in accordance with service
information.
Range
includes but is not limited to – dismantling from connecting rods,
machine piston ring grooves, machine piston top lands.
 New Zealand Qualifications Authority 2016
24291 version 1
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2.3
Connecting rod machining methods are described in accordance with service
information.
Range
includes but is not limited to – resize tunnels, rebush connecting
rods, bore bushes, hone bushes, bored and honed to suit gudgeon
pin clearances.
2.4
Gudgeon pin fits, and fitting oversized or replacement gudgeon pins, are
described in accordance with service information.
2.5
Procedures for fitting pistons to connecting rods are described in accordance
with service information.
Range
includes but is not limited to – clear oil passages, alignment and
adjustments, lubrication, coatings.
Please note
Providers must be accredited by NZQA, or an inter-institutional body with delegated
authority for quality assurance, before they can report credits from assessment against
unit standards or deliver courses of study leading to that assessment.
Industry Training Organisations must be accredited by NZQA before they can register
credits from assessment against unit standards.
Accredited providers and Industry Training Organisations assessing against unit standards
must engage with the moderation system that applies to those standards.
Accreditation requirements and an outline of the moderation system that applies to this
standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP also includes useful information about special requirements for organisations
wishing to develop education and training programmes, such as minimum qualifications for
tutors and assessors, and special resource requirements.
Comments on this unit standard
Please contact the NZ Motor Industry Training Organisation (Incorporated)
info@mito.org.nz if you wish to suggest changes to the content of this unit standard.
 New Zealand Qualifications Authority 2016