ENGLISH FOR AUTOMOBILE ENGINEERING-UNIT 7

If your car doesn’t start in the morning, you should checkthree things first: the battery, the fuel level and the sparkplugs. It is easy to repair three faults. If the battery is flat,you should recharge it. If it doesn’t work, you shouldreplace it. If the petrol tank is empty, fill it up. If the sparkplugs are dirty, clean them, and if the gap in a spark plugis too narrow or too wide, adjust it to the correct width.Read the text and match these pictures in Figure 7.1 withwords from the passage:If your car still doesn’t start, the petrol pump may...
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ENGLISH FOR AUTOMOBILE ENGINEERING-UNIT 7 SUBJECTSENGLISH FOR AUTOMOBILE ENGINEERING LECTURER: LANG VAN THANGFACUTY OF MECHANICAL ENGINEERINGHO CHI MINH UNIVERSITY OF INDUSTRY EMAIL: thang.langvan@hotmail.com HOCHIMINH UNIVERSITY OF INDUSTRY ENGLISH FOR AUTOMOBILE ENGINEERING UNIT 7FINDING A FAULT IN A CAR MAY 14, 2011 HOCHIMINH UNIVERSITY OF INDUSTRY PresentationRead the text and match these pictures in Figure 7.1 withwords from the passage:If your car doesn’t start in the morning, you should checkthree things first: the battery, the fuel level and the sparkplugs. It is easy to repair three faults. If the battery is flat,you should recharge it. If it doesn’t work, you shouldreplace it. If the petrol tank is empty, fill it up. If the sparkplugs are dirty, clean them, and if the gap in a spark plugis too narrow or too wide, adjust it to the correct width.If your car still doesn’t start, the petrol pump may bebroken, or the fuel pipe may be blocked. If the pump isbroken, it must be repaired or replaced. If the fuel pipe isblocked, take it off and unblock it. HOCHIMINH UNIVERSITY OF INDUSTRY PresentationIf there is a loud CLICK! When you turn the key, thestarter motor may be jammed. If it is, you can try to releaseit by pushing the car forwards and backwards (in 2nd gear).If the car still doesn’t start, the starter motor should berepaired or replaced. HOCHIMINH UNIVERSITY OF INDUSTRY Practice 1Read the text and then complete the table 7.1:Petrol will not burn unless it is mixed with air: normallythe proportion of air to petrol required to burn fuelcompletely is 15 (air): 1 (petrol). This means that 1 kg ofpetrol should be mixed with 15 kg of air. More air or lesspetrol gives a weak mixture i.e. an air: petrol ratio greaterthan 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 andpossibly overheating of the engine. A rich mixture, whichwill also mean slow combustion, will similarly result inhigh fuel consumption and low engine power. A furtherindication of rich mixture is black or sooty exhaust gas. HOCHIMINH UNIVERSITY OF INDUSTRY Practice 1 Mixture Combustion Exhaust gas Effects strengthVery weak,e.g. ______ _______ _ _ _ _ _ _ _ __Very rich, e.g._______ _______ _ _ _ _ _ _ _ _ _ _ _ _ __ _ __ HOCHIMINH UNIVERSITY OF INDUSTRY Practice 2Use 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 2Now use the text above and Figure 7.2 to complete the textbelow: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 3Use Table 7.2 and Figure 7.3 to complete the text: Fault Reasons RemedyExcessive 1. Choked air cleaner 7. Clean air cleanerfuel 2. Leaking carburetor 8. Check and tightenconsumption 3. Incorrectly adjusted screws carburetor 9. Adjust as necessary 4. Incorrectly type of silencer 10. Fit correct silencerLow engine 5. Weak mixture due to 11. Remove float needlepower 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 3Use Table 7.2 and Figure 7.3 to complete the text: Excessive fuel consumption can be caused by one ofthe following reasons: a choked air cleaner, _ _ _ _ _ _, __ _ _ _ _ or _ _ _ _ _ _. If the air cleaner is not choked,examine the carburetor, since high fuel consumptioncould indicate either _ _ _ _ or _ _ _ _ . Check and tighten all screws and adjust as necessary.If, after checking the carburetor, fuel consumption is stillhigh, it will probably mean _ _ _ _ . HOCHIMINH UNIVERSITY OF INDUSTRY Practice 3Use 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 DevelopmentRead 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 petroland air mixture ignites near the spark. Then, heatgiven off by the burning fuel particles cause adjacentparticles to ignite. Consequently, a flame front spreadsthrough the combustion chamber. HOCHIMINH UNIVERSITY OF INDUSTRY Development As a result of thermal radiation, increased pressure andhot pockets in the combustion chamber, a second ignitionand flame front may occur in the unburn ...