8.1 State THREE manufacturers' specifications that could be used to conduct an oil pressure test - NSC Mechanical Technology Automotive - Question 8 - 2019 - Paper 1
Question 8
8.1 State THREE manufacturers' specifications that could be used to conduct an oil pressure test.
8.2 Give TWO reasons why an exhaust pressure test is conducted.
8... show full transcript
Worked Solution & Example Answer:8.1 State THREE manufacturers' specifications that could be used to conduct an oil pressure test - NSC Mechanical Technology Automotive - Question 8 - 2019 - Paper 1
Step 1
State THREE manufacturers' specifications that could be used to conduct an oil pressure test.
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
Oil pressure at engine idle speed.
Oil pressure when the engine is cold.
Oil pressure at engine high revolutions.
Step 2
Give TWO reasons why an exhaust pressure test is conducted.
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
To determine if the catalytic converter is blocked.
To identify a decrease in power output.
Step 3
Explain how a pressure test is conducted on a radiator cap.
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
To conduct a pressure test on a radiator cap, the following steps are taken:
The cap is installed on the cooling system pressure tester.
Pressure is increased in the tester while monitoring the pressure gauge.
The cap should release the pressure at a rated stamp pressure on the cap, and it should hold pressure for at least one minute.
Step 4
List FOUR manufacturer's specifications that must be obtained before a fuel pressure test can be carried out.
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
Fuel pressure before fuel pump.
Fuel pressure before the carburettor.
Fuel pressure at idle speed.
Fuel pressure at high revolutions.
Step 5
Remove the high-tension lead.
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
This is done to prevent electrical shock during the testing process.
Step 6
Unplug the fuel-injection system.
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
This prevents unburnt fuel from entering the exhaust system and avoids entering the tester.
Step 7
Open the throttle valve fully.
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
This allows for the correct amount of air entering the cylinder, ensuring an accurate reading.
Step 8
Record the readings.
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
This involves noting the readings obtained during the compression test to determine if the piston rings are worn.
Step 9
Explain how a wet compression test is conducted on an internal combustion engine after a dry compression test has been done on the engine.
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
A wet compression test is performed by adding a small amount of oil to each cylinder and then repeating the compression test. If the readings increase, it indicates that the piston rings are worn.
