ENGLISH FOR AUTOMOBILE ENGINEERING-UNIT 7

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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...

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Nội dung Text: ENGLISH FOR AUTOMOBILE ENGINEERING-UNIT 7

SUBJECTS ENGLISH FOR AUTOMOBILE ENGINEERING LECTURER: LANG VAN THANG FACUTY OF MECHANICAL ENGINEERING HO CHI MINH UNIVERSITY OF INDUSTRY EMAIL: thang.langvan@hotmail.com HOCHIMINH UNIVERSITY OF INDUSTRY
ENGLISH FOR AUTOMOBILE ENGINEERING UNIT 7 FINDING A FAULT IN A CAR MAY 14, 2011 HOCHIMINH UNIVERSITY OF INDUSTRY
Presentation Read the text and match these pictures in Figure 7.1 with words from the passage: 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. 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
Practice 1 Mixture Combustion Exhaust gas Effects strength Very weak, e.g. ______ _______ _ _ _ _ _ _ _ __ Very rich, e.g. _______ _______ _ _ _ _ _ _ _ _ _ _ _ _ __ _ __ 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 1. Choked air cleaner 7. Clean air cleaner fuel 2. Leaking carburetor 8. Check and tighten consumption 3. Incorrectly adjusted screws carburetor 9. Adjust as necessary 4. Incorrectly type of silencer 10. Fit correct silencer Low engine 5. Weak mixture due to 11. Remove float needle power jammed float needle and clean 6. Weak mixture due to air • Check and tighten all leak at carburetor joint 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 _ _ _ _ . HOCHIMINH UNIVERSITY OF INDUSTRY
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 _ _ _ _ _ _ _, engine power is 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 adjacent particles to ignite. Consequently, a flame front spreads through the combustion chamber. HOCHIMINH UNIVERSITY OF INDUSTRY
Development As a result of thermal radiation, increased pressure and hot pockets in the combustion chamber, a second ignition and flame front may occur in the unburned mixture. Sometimes this may lead to violent combustion of the unburned mixture, causing knocking in the engine. Cause Effects Heat given off by burning 1._ _ _ _ _ _ __ _ _ _ _ fuel particles 2. a flame front spreads through the combustion chamber Thermal radiation, _ _ _ _ a second ignition and flame front_ _ _ __ and _ _ _ _ __ __ _ 3. _ _ ___ HOCHIMINH UNIVERSITY OF INDUSTRY