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
Label A–D
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Answer
A - Spark Plug Adaptor
B - Pressure Gauge
C - Leakage Gauge
D - Air Supply Hose
Step 2
What is the purpose of the cylinder leakage tester?
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Answer
The purpose of the cylinder leakage tester is to determine the percentage of gas leakage from an engine cylinder, identifying potential issues such as valve leaks, piston ring wear, or gasket failures.
Step 3
State, in the correct sequence, the set-up procedure of the cylinder leakage tester on an internal combustion engine.
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Answer
Turn the crankshaft until both valves on cylinder No. 1 are closed (ensuring it is on the power stroke).
Remove the spark plug and connect the spark plug adaptor (tester) to the spark plug hole.
Use a spanner to lock the crankshaft pulley to prevent it from turning.
Release air into the cylinder according to the prescribed pressure.
Read the gauge to indicate the percentage gas leakage.
Listen for hissing sounds at various points to locate any leaks.
Step 4
What is the purpose of conducting an engine cylinder compression test?
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Answer
The purpose is to determine the amount of compression pressure from a specific cylinder during the compression stroke, which helps assess the condition of the engine's valves, valve seats, and piston rings.
Step 5
State ONE purpose of the pressure relief valve in the compression tester.
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Answer
The pressure relief valve allows the user to remove pressure from the gauge to ensure an accurate reading and prevent damage to the gauge.
Step 6
Name TWO gases that the exhaust gas analyser analyses.
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Answer
Carbon monoxide (CO)
Hydrocarbon (HC)
Step 7
What is the purpose of the turn tables with reference to the wheel alignment equipment?
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Answer
Turn tables make it possible to turn the front wheels when conducting wheel alignment adjustments.
Step 8
State THREE outcomes of dynamic wheel balancing.
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Answer
The elimination of wheel vibrations.
The reduction of unbalanced forces acting on the vehicle.
Enhanced steering response and overall ride quality.
