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
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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 _ _ _ _ .

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
fuel particles
1._ _ _ _ _ _ __ _ _ _ _
2. a flame front spreads through the
combustion chamber
Thermal radiation, _ _ _ _
_ __ and _ _ _ _ __
a second ignition and flame front_ _
__ _ 3. _ _ ___