Jack conducted a compression test on a four-cylinder petrol engine - NSC Mechanical Technology Welding and Metalwork - Question 3 - 2016 - Paper 1
Question 3
Jack conducted a compression test on a four-cylinder petrol engine. He found that the engine has low compression.
3.1.1 Name TWO types of compression tests Jack can... show full transcript
Worked Solution & Example Answer:Jack conducted a compression test on a four-cylinder petrol engine - NSC Mechanical Technology Welding and Metalwork - Question 3 - 2016 - Paper 1
Step 1
Name TWO types of compression tests Jack can perform on his car's engine.
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Answer
Wet compression test
Dry compression test
Step 2
Give TWO reasons for low compression in the engine.
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Answer
Worn cylinders
Worn piston rings
Step 3
Name the equipment that is used to check the oil pump for functionality.
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Answer
Oil pressure meter or oil pressure tester
Step 4
Explain, in point form, the procedure when the cooling-system pressure tester is used to test the pressure in the cooling system.
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Answer
Remove the radiator cap and fit the tester.
Pump air at the prescribed pressure into the system.
Note the reading; if the reading drops, it indicates a leaking system.
To test for a leaking cylinder-head gasket, the engine is started.
If the reading increases while the engine idles, it indicates a leaking cylinder-head gasket.
