Remove and replace light vehicle transmission and driveline units and components

Business Sectors (Suites): Maintenance and Repair - Light Vehicle
Developed by: IMI
Approved on: 30 Mar 2020


This NOS is about removing and replacing units and components where dismantling and re-assembly of transmission and driveline systems is required. It is also about evaluating the performance of replaced units and components. The units and components concerned are not those replaced as part of normal routine, vehicle maintenance (servicing) activities.

Performance criteria

You must be able to:

P1 use suitable personal and vehicle protective equipment throughout all removal and replacement activities
P2 support your removal and replacement activities by reviewing:

P2.1 vehicle technical data
P2.2 removal and replacement procedures
P2.3 legal requirements
P3 prepare the vehicle systems and work area for safe working procedures (where appropriate)
P4 prepare, check and use all the equipment required following manufacturers' instructions
P5 carry out all removal and replacement activities following; 

P5.1 manufacturers' instructions
P5.2 recognised repair methods
P5.3 health, safety and environmental requirements
P5.4 your workplace procedures
P6 work in a way which minimises the risk of:

P6.1 damage to other vehicle systems
P6.2 damage to other vehicle components and units
P6.3 contact with leakage
P6.4 contact with hazardous substances
P6.5 damage to your working environment
P7 ensure replacement transmission or driveline units and components conform to the vehicle operating specification and any legal requirements
P8 record and report any additional faults you notice during the course of your work promptly
P9 use suitable testing methods to evaluate the performance of the reassembled system accurately
P10 ensure the reassembled transmission or driveline system performs to the vehicle operating specification and meets any legal requirements prior to return to the customer
P11 ensure your records are accurate, complete and passed to the relevant person(s) within the agreed timescale and in the format required
P12 complete all removal and replacement activities within the agreed timescale
P13 report any expected delays in completion to the relevant person(s) promptly 

Knowledge and Understanding

You need to know and understand:

Legislative and organisational requirements and procedures
K1 the legal requirements relating to the vehicle
K2 the legislation and workplace procedures relevant to 

K2.1 health and safety
K2.2 the environment (including waste disposal)
K2.3 personal and vehicle protective equipment
K3 your workplace procedures for:

K3.1 recording removal and replacement information
K3.2 the referral of problems
K3.3 reporting delays to the completion of work
K4 the importance of documenting removal and replacement information
K5 the importance of working to agreed timescales and keeping others informed progress
K6 the relationship between time and costs
K7 the importance of reporting anticipated delays to the relevant person(s) promptly

Use of technical information

K8 how to find, interpret and use sources of information applicable to units and component removal and replacement within transmission and driveline systems
K9 the importance of using suitable sources of technical information
K10 the purpose of and how to use identification codes

Electrical and electronic principles

K11 vehicle earthing principles and earthing methods 
K12 electrical and electronic principles associated with transmission and driveline systems
K13 types of circuit protection and why these are necessary
K14 electrical safety procedures electric symbols, units and terms
K15 electrical and electronic control system principles
K16 the hazards associated with working on or near high energy electrical vehicle components

Transmission and driveline system operation and construction

K17 how transmission and driveline systems and their related units and components are constructed, removed and replaced for the classification of vehicle worked upon
K18 how transmission and driveline systems and their related units and components operate for the classification of vehicle worked upon


K19 how to prepare, check and use all the removal and replacement equipment required

Transmission and driveline system units and components removal and replacement

K20 how to remove and replace transmission and driveline system mechanical, electrical and hydraulic/pneumatic units and components for the classification of vehicle worked upon 
K21 how to select and use gaskets, sealants, seals, fittings and fasteners
K22 how to test and evaluate the performance of replacement transmission and driveline system units and components and the reassembled system against the vehicle operating specifications and any legal requirements
K23 how to select the appropriate test method when checking transmission and driveline systems following replacement of components
K24 when replacement units and components must meet the original equipment specification (OES) for warranty or other requirements
K25 how to work safely avoiding damage to other vehicle systems, units and components and contact with leakage and hazardous substances


*1. Equipment** is:

1.1. hand tools
1.2. special workshop tools
1.3. general workshop equipment
1.4. electrical testing equipment

2. Testing methods are:

2.1. visual
2.2. aural
2.3. functional
2.4. measurement

3. Units and components are:

3.1. mechanical
3.2. electrical
3.3. hydraulic/pneumatic

4. Transmission and driveline systems are:

4.1. gearbox
4.2. hubs and bearings
4.3. final drive assembly
4.4. driveline components (including propeller shafts and drive shafts)
4.5. clutch

Scope Performance

Scope Knowledge





This section contains examples and explanations of some of the terms used but does not form part of the standard.
Agreed timescales:
Examples include: manufacturer's recommended work times, job times set by your company or a job time agreed with a specific customer.

Units and components:
Any unit or component from the transmission and driveline systems defined in the scope/range above.

Functional testing:
Examples include: use of brake roller tester, chassis dynamometer, transmission stall test.

These can be any of the following – light vehicles. Additionally, these vehicles may be SI, CI, Hybrid or Alternative fuel vehicles.

Alternative fuel:
This is defined as any type of fuel that may be used to power an internal combustion engine, examples would include LPG, bio ethanol etc.

Links To Other NOS

External Links

Version Number


Indicative Review Date

31 Mar 2024





Originating Organisation


Original URN


Relevant Occupations

Engineering, Light Vehicle Service Technician (Automotive), Vehicle Trades

SOC Code



Components; light; vehicle; transmission; gearbox; driveshaft; clutch; differential; driveline; remove; replace