ENGLISH FOR AUTOMOBILE ENGINEERING-UNIT 7 ppt

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.. Practi

ENGLISH FOR AUTOMOBILE

ENGINEERING

LECTURER: LANG VAN THANG FACUTY OF MECHANICAL ENGINEERING

HO CHI MINH UNIVERSITY OF INDUSTRY

EMAIL: thang.langvan@hotmail.com

SUBJECTS

UNIT 7

MAY 14, 2011

ENGLISH FOR AUTOMOBILE

ENGINEERING

FINDING A FAULT IN A CAR

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

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

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

Mixture strength Combustion Exhaust gas Effects

Very weak,

e.g.

Very rich, e.g.

Practice 1

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 _ _ _

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 _ _ _ _ _ _ _ _ _ _ _ _ _ _

Practice 3

Use Table 7.2 and Figure 7.3 to complete the text:

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

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 _ _ _ _ _ _ _, engine power is still low, this _ _ _ _ _ _ _ that there is an air leak at the carburetor joint In this case _ _ _ _ _ _ _ _ _ _ _ _

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

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

Heat given off by burning

combustion chamber Thermal radiation, _ _ _ _

_ and _ _ _ _ a second ignition and flame front_ _ _ 3 _ _ _