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 explai... 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
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
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?
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The cylinder leakage tester is used to check for leaks in the combustion chamber. It measures pressure loss during the compression stroke, helping to determine the effectiveness of the combustion chamber and identify potential issues.
Step 3
Briefly explain how to set up the cylinder leakage tester to check for leaks in the combustion chamber.
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Turn the crankshaft until both valves on the cylinder to be tested are closed.
Remove the HT leads/spark plugs.
Connect the spark plug adaptor (tester) to the spark plug hole.
Couple the compressed air pipe to the tester and calibrate the tester.
Apply pressure and observe the results to check for leaks.
Step 4
Name TWO other gases that can also be analysed by a exhaust gas analyser.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Hydrocarbon (HC) and Sulphur dioxide (SO₂).
Step 5
State THREE precautions when performing an exhaust gas analysis test.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Always calibrate the exhaust gas analyser with the pick-up hose removed.
Ensure the pick-up hose connections are not stepped on or restricted.
Conduct the test in a well-ventilated area.
Step 6
Explain the function of the turn-tables when checking the wheel alignment angles.
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Turn-tables allow for the turning of the front wheels in and out, facilitating the measurement of the wheel alignment angles from various positions, ensuring accuracy in adjustments.
Step 7
What is the optical alignment gauge used for?
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
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.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
