Skills in Light Vehicle Four Wheel Alignment — City & Guilds Limited End-Point Assessment Motor Vehicle & Transport Revision
This subtopic covers the practical skills required to accurately measure and adjust the geometry of a light vehicle's four-wheel alignment, ensuring optima
Topic Synopsis
This subtopic covers the practical skills required to accurately measure and adjust the geometry of a light vehicle's four-wheel alignment, ensuring optimal tyre wear, fuel efficiency, and vehicle handling. Learners will develop proficiency in using alignment equipment, interpreting readings, making component adjustments, and advising customers on corrective actions, all within strict health and safety guidelines.
Key Concepts & Core Principles
- Tyre construction: Understanding the layers of a tyre (tread, sidewall, belts, plies, bead) and how they affect performance and safety.
- Tyre identification: Reading sidewall markings (e.g., size, load index, speed rating, date code) to select the correct tyre for a vehicle.
- Fitting and balancing: Correct procedures for mounting and demounting tyres, using tyre changers and balancers, and applying torque settings.
- Health and safety: Following COSHH regulations, using PPE, handling hazardous materials (e.g., old tyres, balancing weights), and ensuring workshop safety.
- Tyre pressure monitoring systems (TPMS): Understanding direct and indirect TPMS, how to service them, and the importance of correct pressure for fuel economy and tyre life.
Exam Tips & Revision Strategies
- In practical assessments, narrate your process: explain why you are checking tyre pressures and ride height first, and what each angle affects (e.g., camber influences tyre edge wear).
- Always refer to the vehicle manufacturer’s alignment specifications, not generic ones, and be prepared to demonstrate how you locate these data in the workshop information system.
- When recording information, note any seized adjusters or wear components and recommend related services (e.g., 'camber bolt replacement' or 'suspension bushing inspection').
- For safety questions, emphasize that the alignment lift must be clear of obstructions and you must never adjust under a vehicle supported only on a jack.
- Always begin by referencing the vehicle manufacturer’s specifications; demonstrate your ability to access and interpret digital or printed data sources.
- In practical assessments, narrate your actions clearly to show assessors your understanding of each step, especially when identifying safety critical checks.
- When recording results, double-check your entries against the alignment machine printout to ensure accuracy—assessors will verify this.
- If a setting cannot be adjusted due to vehicle design or faults, clearly state the limitation and recommend further investigation, showing your wider diagnostic understanding.
Common Misconceptions & Mistakes to Avoid
- Students often forget to check tyre pressures and ride height before alignment, leading to inaccurate readings.
- Misinterpreting alignment printouts, e.g., confusing positive and negative toe or camber values.
- Attempting to adjust angles that are non-adjustable without consulting manufacturer procedures, potentially damaging components.
- Failing to neutralize the steering wheel and lock it during measurements, causing inconsistent results.
- Failing to perform a pre-alignment inspection of tires, suspension, and steering components, which can lead to inaccurate alignment or missed underlying issues.
- Misinterpreting alignment angle readings (e.g., confusing positive and negative camber) or using incorrect units of measurement.
Examiner Marking Points
- Award credit for demonstrating correct preparation of the vehicle and alignment bay, including checking tyre pressures, vehicle loading, and suspension condition before measurements.
- Expect accurate use of alignment sensors/targets and software to capture live caster, camber, and toe data for both front and rear axles.
- Adjustments must be made to manufacturer specifications, with clear documentation of 'before' and 'after' values, and credit for explaining the impact of any non-adjustable angles.
- Credit for following safe working practices, such as wearing appropriate PPE, using axle stands if required, and ensuring the vehicle is securely positioned on the alignment lift.
- Award credit for demonstrating a systematic safety check of the alignment equipment and vehicle lifting procedures before commencing work.
- Credit should be given for accurately interpreting alignment readings against manufacturer data and identifying any deviations beyond tolerance.
- Marks are earned by correctly adjusting tie rods, cam bolts, or other specified components to bring measurements within specification, following a logical sequence.
- Evidence must show clear, legible recording of before-and-after measurements on the appropriate service documentation, along with any recommendations for additional work.