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8.1 State FOUR safety requirements to meet during the setting up of the gas analyser on an internal combustion engine - NSC Mechanical Technology Automotive - Question 8 - 2020 - Paper 1
Question 8
8.1 State FOUR safety requirements to meet during the setting up of the gas analyser on an internal combustion engine. 8.2 State THREE safety precautions to adhere ... show full transcript
Worked Solution & Example Answer:8.1 State FOUR safety requirements to meet during the setting up of the gas analyser on an internal combustion engine - NSC Mechanical Technology Automotive - Question 8 - 2020 - Paper 1
Step 1
State FOUR safety requirements to meet during the setting up of the gas analyser on an internal combustion engine.
Answer
- Ensure that there are no leaks in the exhaust, manifolds or vacuum system to prevent hazardous emissions.
- Conduct the test in a well-ventilated area to avoid inhaling harmful gases.
- Make sure the power battery connection of the gas analyser is secure to ensure proper functioning.
- Place the tester in a stable position to prevent it from falling off the engine or onto the ground.
Step 2
State THREE safety precautions to adhere to when setting up the fuel pressure tester on an internal combustion engine.
Answer
- Ensure the location where the tester is connected is accessible and safe before removing the sender unit.
- Use the correct adapter for the engine to prevent any malfunctions.
- Check the pressure tightness of the couplings to avoid leaks during testing.
Step 3
Explain the difference between a compression test and a cylinder leakage test performed on an internal combustion engine.
Answer
The compression test determines the overall condition of the engine's cylinders by measuring the compression pressure when the engine is cranked. In contrast, the cylinder leakage test identifies how well each cylinder retains its pressure by using compressed air while the engine is turned off, allowing for the detection of specific leaks.
Step 4
State FOUR safety precautions to adhere to while setting up a compression tester on an engine.
Answer
- Ensure that the tester can reach the spark plug holes safely without obstruction.
- Clean the plug holes with compressed air to eliminate debris before removing the spark plugs.
- Disable the fuel supply to prevent accidental ignition during the test.
- Be cautious when cranking the engine to prevent injuries from moving parts.
Step 5
Complete TABLE 8.5 by adding another TWO possible causes and another TWO corrective measures at each fault.
Answer
8.5.1 Possible Causes:
- Blocked oil pump sieve in the oil sump.
- Worn gearbox.
Corrective Measures:
- Remove sump and clean the sieve.
- Overhaul the gearbox.
8.5.2 Possible Causes:
- Oil pressure relief valve malfunctioning.
- Oil filter is clogged.
Corrective Measures:
- Renew the oil pressure relief valve.
- Replace or clean the oil filter.
8.5.3 Possible Causes:
- Incorrect installation of oil gaskets.
- Contaminated oil due to external leaks.
Corrective Measures:
- Replace defective gaskets.
- Change the oil thoroughly.
8.5.4 Possible Causes:
- Low oil level in the engine.
- Worn out bearings.
Corrective Measures:
- Top-up with oil until the correct level is reached.
- Replace the bearings if necessary.