NSC Mechanical Technology Automotive Use test equipment to diagnose faults: 5.1 The steps to conduct a compr

Question

5.1 The steps to conduct a compression test on an internal combustion engine are listed below. Complete STEPS 5 to 8.

STEP 1
Ensure the engine is at operating temperature.

STEP 2
Disconnect the fuel supply and ignition system.

STEP 3
Clean the area around the spark plugs and remove all spark plugs.

STEP 4
Connect a compression tester to the spark plug hole.

STEP 5
5.1.1

STEP 6
5.1.2

STEP 7
5.1.3

STEP 8
5.1.4

5.2 Answer the questions related to the cylinder leakage tester shown in FIGURE 2 below.

5.2.1 Label parts A–D in FIGURE 2 above. (4)

5.2.2 What is the unit of measure on component A? (1)

5.3 Name TWO components that protect the exhaust gas analyser against soot and moisture when performing the exhaust gas analysing test. (2)

5.4 Describe the set-up procedure of an on-board diagnostics (OBD) scanner to check for faults. (3)

5.5 FIGURE 5.5 below shows a machine used in an automotive workshop. Answer the questions that follow.

5.5.1 Identify the machine shown in FIGURE 5.5 above. (1)

5.5.2 What is the function of the machine shown in FIGURE 5.5 above? (1)

5.5.3 Which safety feature is not present on the machine in FIGURE 5.5 above? (1)

5.6 Which THREE wheel alignment angles can be measured using the bubble gauge? (3)

5.7 State THREE precautions to be taken before the optical wheel alignment equipment is fitted to the wheels.

5.1 The steps to conduct a compression test on an internal combustion engine are listed below - NSC Mechanical Technology Automotive - Question 5 - 2021 - Paper 1