FIGURE 5.1 below shows a cylinder leakage tester. Answer the questions that follow.
5.1.1 Label A–D.
5.1.2 What is the purpose of the cylinder leakage tester?
5.1... show full transcript
Worked Solution & Example Answer:FIGURE 5.1 below shows a cylinder leakage tester - NSC Mechanical Technology Automotive - Question 5 - 2019 - Paper 1
Step 1
5.1.1 Label A–D.
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Answer
A - Cylinder Connector
B - Pressure Gauge (for cylinder pressure)
C - Leakage Gauge (for indicating gas leakage)
D - Release Valve
Step 2
5.1.2 What is the purpose of the cylinder leakage tester?
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Answer
The cylinder leakage tester is used to measure the amount of gas leakage from the combustion chamber of an engine. It helps to identify issues such as worn piston rings, damaged valves, or poor sealing surfaces, which may affect engine performance.
Step 3
5.1.3 State, in the correct sequence, the set-up procedure of the cylinder leakage tester on an internal combustion engine.
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Turn the crankshaft until both valves on cylinder no. 1 are closed (ensure the piston is at the top dead center).
Remove the spark plug from cylinder no. 1 and connect the spark plug adaptor (tester) to the spark plug hole.
Use a spanner to lock the crankshaft pulley so that it cannot turn during the test.
Release air into the cylinder according to the prescribed pressure.
The reading will indicate the percentage gas leakage.
Listen for a hissing sound at various points to diagnose the location of the leak.
Step 4
5.2.1 What is the purpose of conducting an engine cylinder compression test?
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Answer
The purpose of conducting an engine cylinder compression test is to determine the amount of compression pressure from a specific cylinder during its compression stroke. This helps in assessing the condition of the engine's valves, valve seats, and piston rings.
Step 5
5.2.2 State ONE purpose of the pressure relief valve in the compression tester.
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The pressure relief valve is used to remove pressure from the gauge to ensure an accurate reading and to prevent damage to the gauge during the testing process.
Step 6
5.3 Name TWO gases that the exhaust gas analyser analyses.
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Carbon monoxide (CO)
Hydrocarbon (HC)
Step 7
5.4 What is the purpose of the turn tables with reference to the wheel alignment equipment?
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Turn tables make it possible to turn the front wheels when conducting wheel alignment settings, allowing for accurate alignment adjustments.
Step 8
5.5 State THREE outcomes of dynamic wheel balancing.
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Elimination of vibration in the steering wheel.
Longer lifespan of tires due to even wear.
Increased comfort for passengers due to smoother ride quality.
