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

1. Determine if the catalytic converter is blocked. A blockage can lead to increased back pressure, affecting engine performance and efficiency.

2. Identify a decrease in power output. Monitoring exhaust pressure can reveal issues within the exhaust system contributing to power loss.

1. Install the cap on the cooling system pressure tester. This ensures a proper seal for the test.

2. Increase the pressure in the tester while observing the pressure gauge. Watch for any drops in pressure which would indicate a fault.

3. Check the pressure release. The cap should release pressure at a specified value to ensure it maintains operation within designed limits.

1. Fuel pressure before fuel pump. This ensures the system can adequately supply fuel.

2. Fuel pressure at idle speed. Knowing this helps assess engine performance at low RPM.

3. Fuel pressure at high revolutions. This indicates how well the fuel system performs under load.

4. Fuel pressure before the injectors pump. Critical for ensuring even distribution to the engine's cylinders.

This step prevents electrical shock and ensures safety while working on the vehicle's ignition system.

This is done to prevent unburned fuel from entering the exhaust system and to stop fuel from entering the cylinders, thus avoiding potential engine damage.

Opening the throttle allows for maximum air intake, ensuring accurate readings during the compression test.

The readings obtained during the compression test are essential for evaluating the condition of the engine and determining if the piston rings are worn.

1. Add oil to the cylinder low on reading. This allows testing of the cylinder’s seal and the condition of the piston rings.

2. Conduct a compression test again. By comparing the wet test results to the dry compression tests, it can determine if the piston rings are indeed worn.