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10.1 State THREE pre-checks performed on the vehicle suspension before wheel alignment adjustments and checks can be done - NSC Mechanical Technology Automotive - Question 10 - 2022 - Paper 1
Question 10
10.1 State THREE pre-checks performed on the vehicle suspension before wheel alignment adjustments and checks can be done. 10.2 Draw a neat labelled sketch to expla... show full transcript
Worked Solution & Example Answer:10.1 State THREE pre-checks performed on the vehicle suspension before wheel alignment adjustments and checks can be done - NSC Mechanical Technology Automotive - Question 10 - 2022 - Paper 1
Step 1
State THREE pre-checks performed on the vehicle suspension before wheel alignment adjustments and checks can be done.
Answer
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Correct preload on the wheel (hub) bearings: Ensure that the bearings are correctly adjusted for optimal performance.
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Suspension ball joints for wear: Check the ball joints for any signs of wear or damage which could affect vehicle handling.
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Sagged springs: Inspect the springs for sagging, which indicates they may need to be replaced or adjusted.
Step 2
Draw a neat labelled sketch to explain toe-out when turning to the right.
Answer
To illustrate toe-out when turning right, draw a diagram showing the vehicle with the outer wheel at a greater steering angle (e.g., 20°) compared to the inner wheel (e.g., 23°). Label the outer and inner wheels clearly, and indicate the steering angles to emphasize the difference. Ensure the diagram accurately represents the concept of toe-out.
Step 3
State TWO suspension faults that will negatively affect toe-out on turns.
Answer
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Wear on the suspension parts: Any wear on components such as control arms or bushings can lead to improper alignment and negatively affect toe-out.
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Wheel bearing wear: Worn wheel bearings can create excess play, leading to alignment issues during turns.
Step 4
Explain the procedure to statically balance a wheel.
Answer
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Mount the wheel: Place the wheel on a spindle to allow it to spin freely.
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Spin the wheel slowly: Allow the wheel to rotate, observing its behavior as it starts to come to rest.
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Identify the heavy spot: If the wheel is unbalanced, it will come to rest at the same position at the bottom, indicating the 'heavy spot.'
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Add weights: Attach a small weight to the opposite side of the heavy spot and repeat the spin until the wheel stops at random positions, indicating balance.
Step 5
The electronic control unit (ECU) controls many systems on a vehicle. State the functions of the following systems:
Answer
10.5.1 Air-induction system: It measures and controls the air required for combustion in the engine.
10.5.2 Ignition system: The function is to ignite the air/fuel mixture in the combustion chamber at the correct timing.
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