5.1 FIGURE 5.1 shows a compression tester. Label parts A–D as indicated in FIGURE 5.1. 5.2 What is the function of the cylinder leakage tester? 5.3 Briefly explain how to set up the cylinder leakage tester to check for leaks in the combustion chamber. 5.4 Carbon monoxide (CO), nitrogen oxide (NO₂) and oxygen (O₂) are gases that are analysed when conducting an exhaust gas analysis. Name TWO other gases that can be analysed by a exhaust gas analyser. 5.5 State THREE precautions when performing an exhaust gas analysis test. 5.6 Explain the function of the turn-tables when checking the wheel alignment angles. 5.7 What is the optical alignment gauge used for? 5.8 Describe THREE basic functions of the on-board diagnostic scanner.

NSC Mechanical Technology Automotive Purpose-made tooling and diagnostic equipment: 5.1 FIGURE 5.1 shows a compressi

5.1 FIGURE 5.1 shows a compression tester - NSC Mechanical Technology Automotive - Question 5 - 2021 - Paper 1

Question 5

5.1 FIGURE 5.1 shows a compression tester. Label parts A–D as indicated in FIGURE 5.1. 5.2 What is the function of the cylinder leakage tester? 5.3 Briefly explain... show full transcript

Worked Solution & Example Answer:5.1 FIGURE 5.1 shows a compression tester - NSC Mechanical Technology Automotive - Question 5 - 2021 - Paper 1

Step 1

Label parts A–D as indicated in FIGURE 5.1

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Answer

A - Pressure gauge/Pressure meter B - Pressure release valve C - Air hose/Pipe/Flexible pipe D - Spark plug connector/Adapter

Step 2

What is the function of the cylinder leakage tester?

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Answer

The cylinder leakage tester is used to check for leaks in the combustion chamber during the compression stroke. It measures the percentage of pressure loss from the combustion chamber.

Step 3

Briefly explain how to set up the cylinder leakage tester to check for leaks in the combustion chamber.

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Answer

To set up the cylinder leakage tester:

Turn the crankshaft until both valves are closed on the cylinder being tested.
Remove the HT leads or spark plugs.
Connect the spark plug adaptor (tester) to the spark plug hole.
Compress the air into the tester to calibrate it.
Coupling the spark plug adaptor hose to the cylinder leakage tester.
Observe the results and location of gas leakage occurring in the combustion chamber.

Step 4

Name TWO other gases that can be analysed by an exhaust gas analyser.

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Answer

Hydrocarbon (HC)
Sulphur dioxide (SO₂)

Step 5

State THREE precautions when performing an exhaust gas analysis test.

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Always calibrate the exhaust gas analyser with the pick-up hose removed.
The pick-up hose connections must be clear and not restricted in any way.
Ensure the vehicle does not have leaks in the exhaust, manifolds or vacuum systems.

Step 6

Explain the function of the turn-tables when checking the wheel alignment angles.

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Answer

The turn-tables function to facilitate the turning of the front wheels in and out, allowing for accurate measurement of wheel alignment angles to ensure proper tracking and wear.

Step 7

What is the optical alignment gauge used for?

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The optical alignment gauge is used to measure and check the toe-in and toe-out of the vehicle.

Step 8

Describe THREE basic functions of the on-board diagnostic scanner.

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Answer

Scan for faults (diagnostics).
Programme the ECU (Electronic Control Unit).
Reset fault codes.

5.1 FIGURE 5.1 shows a compression tester - NSC Mechanical Technology Automotive - Question 5 - 2021 - Paper 1

Worked Solution & Example Answer:5.1 FIGURE 5.1 shows a compression tester - NSC Mechanical Technology Automotive - Question 5 - 2021 - Paper 1

Label parts A–D as indicated in FIGURE 5.1

What is the function of the cylinder leakage tester?

Briefly explain how to set up the cylinder leakage tester to check for leaks in the combustion chamber.

Name TWO other gases that can be analysed by an exhaust gas analyser.

State THREE precautions when performing an exhaust gas analysis test.

Explain the function of the turn-tables when checking the wheel alignment angles.

What is the optical alignment gauge used for?

Describe THREE basic functions of the on-board diagnostic scanner.

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