ENGLISH FOR AUTOMOBILE ENGINEERING-UNIT 7 ppt

HOCHIMINH UNIVERSITY OF INDUSTRY ENGLISH FOR AUTOMOBILE ENGINEERING LECTURER: LANG VAN THANG FACUTY OF MECHANICAL ENGINEERING HO CHI MINH UNIVERSITY OF INDUSTRY EMAIL: thang.langvan@hotmail.com SUBJECTS HOCHIMINH UNIVERSITY OF INDUSTRY UNIT 7 MAY 14, 2011 ENGLISH FOR AUTOMOBILE ENGINEERING FINDING A FAULT IN A CAR HOCHIMINH UNIVERSITY OF INDUSTRY Presentation If your car doesn’t start in the morning, you should check three things first: the battery, the fuel level and the spark plugs. It is easy to repair three faults. If the battery is flat, you should recharge it. If it doesn’t work, you should replace it. If the petrol tank is empty, fill it up. If the spark plugs are dirty, clean them, and if the gap in a spark plug is too narrow or too wide, adjust it to the correct width. Read the text and match these pictures in Figure 7.1 with words from the passage: If your car still doesn’t start, the petrol pump may be broken, or the fuel pipe may be blocked. If the pump is broken, it must be repaired or replaced. If the fuel pipe is blocked, take it off and unblock it. HOCHIMINH UNIVERSITY OF INDUSTRY Presentation If there is a loud CLICK! When you turn the key, the starter motor may be jammed. If it is, you can try to release it by pushing the car forwards and backwards (in 2nd gear). If the car still doesn’t start, the starter motor should be repaired or replaced. HOCHIMINH UNIVERSITY OF INDUSTRY Practice 1 Read the text and then complete the table 7.1: Petrol will not burn unless it is mixed with air: normally the proportion of air to petrol required to burn fuel completely is 15 (air): 1 (petrol). This means that 1 kg of petrol should be mixed with 15 kg of air. More air or less petrol gives a weak mixture i.e. an air: petrol ratio greater than 15:1. Less air or more petrol gives a rich mixture i.e. an air : petrol ratio of less than 15:1. A weak mixture, which will mean very slow combustion, will result in high fuel consumption, low engine power and possibly overheating of the engine. A rich mixture, which will also mean slow combustion, will similarly result in high fuel consumption and low engine power. A further indication of rich mixture is black or sooty exhaust gas. HOCHIMINH UNIVERSITY OF INDUSTRY Mixture strength Combustion Exhaust gas Effects Very weak, e.g. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ Very rich, e.g. _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ _ __ Practice 1 HOCHIMINH UNIVERSITY OF INDUSTRY Practice 2 Use Table 7.1 to complete this text: High fuel consumption and low engine power can be caused by either _ _ _ _ _ _ or _ _ _ _. If the exhaust gas is black, this will indicate _ _ _ _ _. If the engine overheats, this will probably mean the mixture is too _ _ _ __ . HOCHIMINH UNIVERSITY OF INDUSTRY Practice 2 Now use the text above and Figure 7.2 to complete the text below: Damage to sparking plugs can be caused by _ _ _ _ _ _, or _ _ _ _ _ __. If the sparking plug has _ _ _ _ _ _ _ and _ _ _ _ _, this will _ _ _ _ _. If the sparking plug __ _ _ __. If _ __ ___ _ _ _ __ _ _ _ _ _ _ _ _ __ __ _. HOCHIMINH UNIVERSITY OF INDUSTRY Practice 3 Use Table 7.2 and Figure 7.3 to complete the text: Fault Reasons Remedy Excessive fuel consumption 1. Choked air cleaner 2. Leaking carburetor 3. Incorrectly adjusted carburetor 4. Incorrectly type of silencer 7. Clean air cleaner 8. Check and tighten screws 9. Adjust as necessary 10. Fit correct silencer Low engine power 5. Weak mixture due to jammed float needle 6. Weak mixture due to air leak at carburetor joint 11. Remove float needle and clean • Check and tighten all screws HOCHIMINH UNIVERSITY OF INDUSTRY Practice 3 Use Table 7.2 and Figure 7.3 to complete the text: Excessive fuel consumption can be caused by one of the following reasons: a choked air cleaner, _ _ _ _ _ _, _ _ _ _ _ _ or _ _ _ _ _ _. If the air cleaner is not choked, examine the carburetor, since high fuel consumption could indicate either _ _ _ _ or _ _ _ _ . Check and tighten all screws and adjust as necessary. If, after checking the carburetor, fuel consumption is still high, it will probably mean _ _ _ _ . [...]...Practice 3 Use Table 7. 2 and Figure 7. 3 to complete the text: Low engine power _ _ _ _ _ _ _ _ by a weak mixture A weak mixture _ _ _ that the float needle is stuck, in which case remove the float needle and clean it If, after... still low, this _ _ _ _ _ _ _ that there is an air leak at the carburetor joint In this case _ _ _ _ _ _ _ _ _ _ _ _ HOCHIMINH UNIVERSITY OF INDUSTRY Development Read the text and then complete Table 7. 3: A petrol and air mixture is drawn into the cylinder, compressed and ignited by a spark First, the petrol and air mixture ignites near the spark Then, heat given off by the burning fuel particles cause . thang.langvan@hotmail.com SUBJECTS HOCHIMINH UNIVERSITY OF INDUSTRY UNIT 7 MAY 14, 2011 ENGLISH FOR AUTOMOBILE ENGINEERING FINDING A FAULT IN A CAR HOCHIMINH UNIVERSITY. HOCHIMINH UNIVERSITY OF INDUSTRY ENGLISH FOR AUTOMOBILE ENGINEERING LECTURER: LANG VAN THANG FACUTY OF MECHANICAL