Competency in Inspection, Repair and Replacement of Standard Light Vehicle Tyres — City and Guilds of London Institute Vocationally-Related Qualification Motor Vehicle & Transport Revision
This unit focuses on developing the hands-on skills required for the safe inspection, repair, and replacement of standard light vehicle tyres, aligning wit
Topic Synopsis
This unit focuses on developing the hands-on skills required for the safe inspection, repair, and replacement of standard light vehicle tyres, aligning with industry standards. Learners will demonstrate competency in using appropriate tools and techniques to assess tread depth, identify damage, perform puncture repairs, fit tyres correctly, balance wheel assemblies, and verify vehicle readiness, while adhering to health and safety regulations and providing accurate customer documentation.
Key Concepts & Core Principles
- Tyre identification: Understanding tyre size markings (e.g., 205/55 R16), load index, speed rating, and sidewall information to select the correct tyre for a vehicle.
- Wheel removal and refitting: Correct use of jacks and axle stands, torque tightening wheel nuts to manufacturer specifications, and checking wheel alignment.
- Tyre inflation and pressure: Using pressure gauges and air lines to set correct pressures based on vehicle load and tyre type, and understanding the importance of pressure for safety and tyre life.
- Puncture repair: Identifying repairable punctures (within the tread area and not on the sidewall), using string or plug repairs, and following safety procedures for sealing.
- Balancing: Understanding static and dynamic imbalance, using a wheel balancer to add weights, and ensuring smooth running to prevent vibration and uneven wear.
Exam Tips & Revision Strategies
- Familiarise yourself with the City & Guilds assessment criteria document; all practical tasks are graded against specific checkpoints—review them before the observation.
- When performing inspection, verbalise your findings as you go; assessors cannot record what they cannot see, so clearly state measurements and defects.
- Always refer to the vehicle or tyre manufacturer's data (placard or manual) for correct pressure and wheel nut torque values—guessing leads to faults.
- During the balancing task, explain why you are placing weights where you are; this demonstrates understanding of dynamic vs static imbalance.
- For the written or verbal questioning component, be prepared to discuss legal tread depths, date codes, puncture repair limits, and consequences of improper balancing.
- Practice completing the job card or recording sheet as you work, not at the end; accurate real-time records are part of the competency and avoid omissions.
Common Misconceptions & Mistakes to Avoid
- Neglecting to remove the valve core completely before deflating the tyre, leading to a slow deflation and unsafe bead breaking.
- Using a rattle gun to tighten wheel nuts without final torque verification, causing over- or under-tightening that may lead to wheel detachment.
- Misinterpreting tread depth measurements by measuring on the outer ribs rather than the main grooves, giving a false pass for legal limits.
- Forgetting to lubricate the tyre bead and rim during fitting, resulting in improper seating or bead damage during inflation.
- Ignoring run-out checks after balancing, which can mask a bent rim or incorrectly mounted tyre, causing vibration complaints.
- Omitting to note previous repairs or tyre age during inspection, potentially fitting a tyre that is beyond serviceable life or mismounted.
Examiner Marking Points
- Award credit for demonstrating consistent use of PPE (gloves, safety glasses, steel-toe boots) throughout all practical tasks.
- Evidence must show correct jacking and lifting procedures, including locating approved jacking points and using axle stands before removing wheels.
- Require demonstration of accurate tyre inspection using a tread depth gauge and visual checks for cuts, bulges, and uneven wear patterns.
- Instructors should confirm the learner correctly identifies the tyre's speed rating and load index when matching to the vehicle specification.
- Credit should be given for precise application of the puncture repair process, including internal inspection, proper buffing, cementing, and patch/stem insertion followed by a leak test.
- Assess correct wheel balancing procedure: static and dynamic balance check using a calibrated balancer, attachment of weights in the proper planes, and final verification spin.
- Look for systematic final checks: torqueing wheel nuts to manufacturer's specifications with a calibrated torque wrench, resetting TPMS (if applicable), and road testing if required.
- Documentation must include accurate recording of repair details, tyre serial numbers, customer advisory notes, and recommendations for future maintenance.