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Tune and test a four stroke diesel engine
Level
4
Credits
6
Purpose
This unit standard is for people in the automotive repair industry. People
credited with this unit standard are able to: carry out a four stroke diesel
engine inspection and rectify defects prior to tuning; carry out four stroke
diesel engine tuning procedures; and test four stroke diesel engine
performance.
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
Prerequisite: Appropriate driver licence for the vehicle
being driven.
Recommended: Unit 15403, Test and diagnose diesel
fuel injection systems, and repair fuel delivery systems;
and Unit 21692, Perform minor servicing tasks on a
diesel fuel system, or demonstrate equivalent knowledge
and skills.
Replacement information
This unit standard, unit standard 24278, and unit
standard 24280 replaced unit standard 967, unit
standard 15448, and unit standard 15449.
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.
 New Zealand Qualifications Authority 2016
24279 version 1
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Special notes
1
Legislation and publications relevant to this unit standard include but are not limited
to – Health and Safety in Employment Act 1992; Land Transport Rules: Vehicle
Exhaust Emissions 2007, Rule 33001/2; Vehicle Repair 1998, Rule 34001; The
Official New Zealand Road Code, Land Transport New Zealand.
2
Land Transport Rules are produced for the Minister of Transport by Land Transport
New Zealand. These rules are available online at
http://www.landtransport.govt.nz/rules/.
New Zealand Road Code information can be obtained from the following website
http://www.landtransport.govt.nz/roadcode.
3
Definitions
Company requirements refer to instructions to staff on policy and procedures which
are documented in memo or manual format and are available in the workplace.
These requirements include but are not limited to – company specifications and
procedures, work instructions, manufacturer specifications, product quality
specifications, and legislative requirements.
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.
Elements and performance criteria
Element 1
Carry out a four stroke diesel engine inspection and rectify defects prior to tuning.
Performance criteria
1.1
Safe working practices are observed throughout the task in accordance with
legislative requirements.
Range
personal safety, safety of others, vehicle or machine safety,
workshop safety, environmental safety, tools and equipment
safety.
1.2
Suitable tools and equipment are selected and used to enable the engine to be
inspected, and defects rectified in accordance with service information.
1.3
The engine and cooling system are inspected in accordance with service
information. Any oil, coolant, and fuel leaks, and signs of overheating are
recorded.
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1.4
Driving belts are checked for condition and tension in accordance with service
information, and are replaced and adjusted in accordance with manufacturer
specifications.
1.5
Loose or disconnected wires and connectors are connected or secured so that
full electrical conductivity is restored.
1.6
Oil, coolant, and electrolyte levels are topped up in accordance with
manufacturer specifications.
1.7
Hoses and clamps are checked for condition and security, and are repaired or
replaced in accordance with service information to restore full serviceability.
1.8
Rods and linkages are checked for wear and security, and are repaired or
replaced in accordance with service information to restore full serviceability.
1.9
Air and fuel filters are checked for condition, and are cleaned or replaced in
accordance with service information.
1.10
Air pressure readings are measured and results recorded in accordance with
service information.
Range
crankcase pressure, exhaust back pressure, air intake restrictions.
1.11
Air inlet is checked, and restrictions are rectified in accordance with service
information to restore full serviceability of the system.
1.12
Exhaust back pressure is checked, and faults are rectified in accordance with
manufacturer specifications.
1.13
Fuel pressure is checked and compared to manufacturer specifications, and
any faults are rectified in accordance with service information.
Element 2
Carry out four stroke diesel engine tuning procedures.
Performance criteria
2.1
Safe working practices are observed throughout the task in accordance with
legislative requirements.
Range
personal safety, safety of others, vehicle or machine safety,
workshop safety, environmental safety, tools and equipment
safety.
2.2
Suitable tools and equipment are selected and used to enable the engine to be
tuned in accordance with service information.
2.3
Fuel primary and secondary filters are changed in accordance with service
information, and are assembled with new seals ensuring no air can enter, or
fuel leak from the system.
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2.4
Area around the injection pump drive is cleaned so that any pump timing marks
are identified.
2.5
The type of pump coupling is identified from service information.
Range
adjustable, non-adjustable, automatic advance.
2.6
Pump coupling and drive train are checked for security and alignment, any
discrepancies are rectified in accordance with service information.
2.7
Backlash in the drive train is checked and any excess beyond the
manufacturer’s permitted maximum is rectified by adjustment or replacement of
worn parts in accordance with service information.
2.8
The diesel fuel injection pump is timed to the engine in accordance with service
information.
2.9
Engine is run to ensure the injection pump operates in accordance with
manufacturer specifications.
Range
checks – security, performance, no leaks, drive train aligned, pipes
and fittings secure, no air in system.
2.10
Low and high idle governed speed are set in accordance with manufacturer
specifications.
2.11
Engine idle speed is set in accordance with manufacturer specifications.
2.12
Supplementary governing device (if fitted) is adjusted in accordance with
manufacturer specifications.
2.13
Exhaust emissions are checked and readings meet legislative requirements and
manufacturer specifications.
Element 3
Test four stroke diesel engine performance.
Performance criteria
3.1
Safe working practices are observed throughout the task in accordance with
legislative requirements.
Range
3.2
personal safety, safety of others, vehicle or machine safety,
workshop safety, environmental safety, tools and equipment
safety.
Suitable tools and equipment are selected and used to enable engine
performance to be tested in accordance with service information.
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3.3
Engine is operated until the optimum operating temperature is reached as in
accordance with manufacturer instructions before any tests are carried out.
3.4
Engine is tested replicating its normal usage in accordance with service
information, and the test results are recorded in accordance with company
requirements.
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