Overhaul heavy goods and public service vehicle mechanical units
URN: IMIHGPSV11
Business Sectors (Suites): Maintenance and Repair - Heavy Goods and Public Service Vehicles
Developed by: IMI
Approved on:
30 Mar 2021
Overview
This standard is about the bench-based overhaul of mechanical units, involving dismantling, assessment, repair, replacement or adjustment of internal components together with re-assembly and testing.
Performance criteria
You must be able to:
P1 wear suitable personal protective equipment throughout all overhauling activities
P2 use suitable sources of technical information to support your overhauling activities
P3 assess and prepare all the equipment required, following manufacturers' instructions, prior to use
P4 use the tools and equipment required correctly and safely throughout all overhauling activities
P5 carry out all overhauling activities following:
P5.1 the manufacturer's instructionsP5.2 your workplace proceduresP5.3 health, safety and environmental requirementsP6 work in a way which minimises the risk of:P6.1 damage to other componentsP6.2 leakagesP6.3 contact with hazardous substancesP7 ensure your assessment of the dismantled unit identifies its condition and suitability for overhaulP8 promptly inform the relevant person(s) where an overhaul is uneconomic or unsatisfactory to performP9 use testing methods which comply with the manufacturer's requirementsP10 adjust the unit's components correctly to ensure that they operate to meet the vehicle operating requirements, when necessaryP11 ensure the overhauled units and assemblies conform to the vehicle operating specification and any legal requirementsP12 ensure your overhaul records are accurate, complete and promptly passed to the relevant person(s) in the format requiredP13 complete all overhauling activities within the agreed timescaleP14 promptly report any anticipated delays in completion to the relevant person(s)
Knowledge and Understanding
You need to know and understand:
Legislative and organisational requirements and procedures
K1 the legal requirements applicable to the units and assemblies overhauled (including road safety requirements)
K2 the legislation and workplace procedures relevant to
K2.1 health and safetyK2.2 the environment (including waste disposal)K2.3 appropriate personal protective equipmentK3 the implications on an Operators Licence of not carrying out repairs correctlyK4 your workplace procedures forK4.1 recording overhauling activitiesK4.2 the referral of problemsK4.3 reporting delays to the completion of workK5 the importance of documenting repair informationK6 the importance of working to agreed timescales and keeping others informed of progressK7 the importance of promptly reporting any anticipated delays to the relevant person(s)
EquipmentK8 how to prepare and check the accuracy and operation of all the overhauling and testing equipment requiredK9 how to use all the overhauling and testing equipment required
Mechanical unit overhauling activitiesK10 how to find, interpret and use sources of information on overhauling procedures and statutory requirementsK11 how the relevant vehicle mechanical units and assemblies operateK12 how mechanical units and assemblies are constructed, dismantled and reassembledK13 the possible causes of faults in mechanical units and assembliesK14 vehicle operating specification for limits, fits and tolerances and where this information can be sourcedK15 how to assess the condition evident within unit sub-assemblies and componentsK16 the cost-benefit relationship between the reconditioning, repair and replacement of components within unitsK17 how to carry out overhauling activities for the types of unit on which you work
K18 the relationship between test methodology and the faults repaired – the use of appropriate testing methodsK19 how to test and evaluate the performance of overhauled units against the operating specificationK20 how to interpret test resultsK21 how to identify the types and causes of mechanical unit and assembly failureK22 how to make suitable adjustments to units and components
K23 how to work safely avoiding personal injury, damage to components, leakage and hazardous substances
Scope/range
1. Overhauling activities are
1.1. dismantling
1.2. assessment
1.3. repair
1.4. replacement
1.5. adjustment of internal components
1.6. re-assembly
1.7. functional testing
Scope Performance
Scope Knowledge
Values
Behaviours
Skills
Glossary
This section contains examples and explanations of some of the terms used but does not form part of the standard.
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Adjustments
Examples include, adjustments made to clearances, settings, pressures, tensions, pre-load and speeds.
Agreed timescales
Examples include manufacturer's recommended work times, job times set by your company or a job time agreed with a specific customer.
Assessments
Examples include those for wear, damage, alignment, corrosion, leakage, distortion and balance.
Equipment
Examples include hand tools, pullers and presses, measuring instruments, refurbishment tools, general workshop equipment and special service tools.
Functional testing
This refers to any applicable functional tests carried out after overhaul.
Heavy goods and public service vehicles
These are medium and large goods vehicles, buses and coaches of 3500kgs gross vehicle mass (GVM) and above.
Mechanical units
Examples are: engines, gear boxes, final drives, steering, suspension, chassis assemblies.
Testing methods
As prescribed by the appropriate technical literature.
Links To Other NOS
External Links
Version Number
3
Indicative Review Date
31 Mar 2024
Validity
Current
Status
Original
Originating Organisation
IMI
Original URN
MRHV11
Relevant Occupations
Engineering, Heavy Vehicle Diagnostic Technician (Automotive), Heavy Vehicle Service Technician (Automotive), Vehicle Trades, Bus and Coach Mechanic, Bus and Coach Mechelec
SOC Code
5231
Keywords
Overhaul; units; mechanical; bench; adjustments; heavy goods vehicle; public service vehicle; bus; coach