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A vehicle is fitted with an automatic gearbox - NSC Mechanical Technology Automotive - Question 9 - 2023 - Paper 1
Question 9
A vehicle is fitted with an automatic gearbox. Explain how the following problems are resolved: 9.1.1 The vehicle needs to be towed over a long distance 9.1.2 Slipp... show full transcript
Worked Solution & Example Answer:A vehicle is fitted with an automatic gearbox - NSC Mechanical Technology Automotive - Question 9 - 2023 - Paper 1
Step 1
9.1.1 The vehicle needs to be towed over a long distance
Answer
To tow a vehicle with an automatic gearbox over a long distance, the following methods can be employed:
- Remove the propeller / drive shaft: This prevents the gearbox from being damaged and allows for safe towing.
- Use a flatbed tow-truck: This method eliminates stress on the transmission by lifting the vehicle entirely off the ground.
- Use a mobi-jack / lift the drive wheels off the ground: This allows the vehicle to be towed without engaging the drivetrain.
Step 2
9.1.2 Slippage occurs inside a torque converter
Answer
Slippage within a torque converter can be resolved by:
- Using a lock-up clutch: This helps to eliminate slip between the engine and transmission by creating a mechanical connection.
- Replacing the torque converter: If issues persist, it may be necessary to replace the torque converter itself.
- Topping up fluids/oil: Ensure that the transmission fluid is at the proper level to maintain effective operation.
Step 3
9.1.3 The automatic gearbox oil overheats
Answer
To address overheating of the automatic gearbox oil, one should:
- Identify the cause of the problem and repair: Check for leaks or blockage in the cooling system.
- Use an oil cooler: Install an additional cooler to regulate oil temperature.
- Topping-up fluids/oil: Ensure the transmission fluid is topped up to the correct level.
Step 4
9.1.4 Gearshift lever position is selected before starting the vehicle
Answer
Before starting the vehicle, it is essential that the gearshift lever is set to the appropriate position. Ensure that it is shifted to either:
- Park (P)
- Neutral (N) This prevents accidental engagement of the drive system once the vehicle is started.
Step 5