15442 version 3
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Carry out repairs to a motorcycle cylinder head
Level
4
Credits
6
Purpose
This unit standard is for people in the motorcycle repair industry. People
credited with this unit standard are able to: disassemble and inspect a
motorcycle engine cylinder head; rectify motorcycle engine cylinder head
faults; and reassemble a motorcycle engine cylinder head.
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
Recommended: Unit 24292, Demonstrate knowledge of
motorcycle engine cylinder head faults, and their
inspection and repair requirements, or demonstrate
equivalent knowledge and skills.
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
Legislation relevant to this unit standard includes but is not limited to – Health and
Safety in Employment Act 1992; Resource Management Act 1991, s15 Discharge of
contaminants into environment; Land Transport Rule: Vehicle Repair 1998, Rule
34001.
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 Qualifications Authority 2016
15442 version 3
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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.
4
Assessment against this standard includes a minimum of three separate multicylinder motorcycle two stroke or four stroke engine cylinder heads.
5
For this unit standard, it is essential that the practical assessment evidence is
obtained in the workplace under normal workplace conditions.
Elements and performance criteria
Element 1
Disassemble and inspect a motorcycle engine cylinder head.
Performance criteria
1.1
Safe working practices are observed throughout the task in accordance with
legislative requirements.
Range
personal safety, safety of others, motorcycle safety, workshop
safety, environmental safety, tools and equipment safety.
1.2
Suitable tools and equipment are selected and used to enable the cylinder head
to be disassembled and inspected in accordance with service information.
1.3
The cylinder head is disassembled in accordance with service information.
1.4
The cylinder head is visually inspected in accordance with service information,
and any damage is noted in accordance with company requirements.
Range
1.5
inspection includes but is not limited to looking for – damaged
threads, surfaces requiring machining, corrosion, broken fins,
cracks.
Disassembled cylinder head components are cleaned and decarbonised to
reveal their condition, in accordance with company requirements and without
damage to components.
Range
chemical cleaning bath, scraping, buffing.
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15442 version 3
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1.6
Valves, seat inserts, and guides are inspected for wear and pitting in
accordance with service information, and their condition is noted in accordance
with company requirements.
Range
visual inspection, precision measuring.
1.7
Valve springs are inspected for squareness, tension, and free length in
accordance with service information. The results obtained are compared with
manufacturer specifications.
1.8
Head components are inspected for wear in accordance with service
information, and their condition is noted in accordance with company
requirements.
Range
components include but are not limited to – camshaft, bearings
and rockers, rocker shafts, slippers, rollers, emission valve
systems, baffle plates, decompression mechanism, hydraulic
lifters, tachometer drive, shim buckets, seals.
1.9
Machined faces are checked for damage and flatness in accordance with
service information, and their condition is noted in accordance with company
requirements.
1.10
Studs and threaded holes are inspected for faults in accordance with service
information, and their condition is noted in accordance with company
requirements.
Range
1.11
damage, clogging, breakage.
A condition report is completed, and a decision as to repair or replace the
cylinder head and components is made in accordance with company
requirements.
Range
report includes but is not limited to – extent of damage, cost,
availability of parts, warranty;
recommendations include but are not limited to – workshop
operations required, outwork arrangements.
Element 2
Rectify motorcycle engine cylinder head faults.
Performance criteria
2.1
Safe working practices are observed throughout the task in accordance with
legislative requirements.
Range
personal safety, safety of others, motorcycle safety, workshop
safety, environmental safety, tools and equipment safety.
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2.2
Valve, valve spring, and stem seal faults are repaired or components replaced
in accordance with service information.
2.3
Camshaft, bearing, rocker, and rocker shaft faults are repaired or components
replaced in accordance with service information.
2.4
Clogged threads are cleaned out, and broken studs are replaced in accordance
with service information.
2.5
Removable valve guides are replaced in accordance with service information.
2.6
Valve guide inserts are machined and fitted in accordance with service
information.
2.7
Valves and valve seats are refaced or replaced in accordance with service
information.
2.8
Valve on-seat spring heights are checked and set in accordance with service
information.
2.9
Broken studs are removed and threads are restored to enable new studs to be
torqued in accordance with service information.
2.10
Cylinder head internal and external threads are restored to engine manufacturer
specifications or recoil manufacturer instructions.
Range
2.11
tapping, using dies and die nuts, recoiling.
Coolant and oil passages are cleared to enable normal circulation to occur in
accordance with service information.
Element 3
Reassemble a motorcycle engine cylinder head.
Performance criteria
3.1
Safe working practices are observed throughout the task in accordance with
legislative requirements.
Range
personal safety, safety of others, motorcycle safety, workshop
safety, environmental safety, tools and equipment safety.
3.2
Suitable tools and equipment are selected and used to enable the motorcycle
cylinder head to be reassembled in accordance with service information.
3.3
The motorcycle cylinder head is reassembled to restore full serviceability in
accordance with service information.
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3.4
Adjustments are carried out in accordance with service information.
Range
valve clearances, bearing clearances, camshaft end float.
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