Page 107 - Mechanic Diesel - TT
P. 107
MECHANIC DIESEL - CITS
8 Emission testing
Maintenance of exhaust system
1 Check for rust and corrosion
2 Look for damage
3 Clean the exterior
4 Remove carbon deposits
5 Listen for unusual noises
6 Check gaskets and seals
7 Check for efficiency
8 Use quality fuel
Causes of failure of the components of exhaust system
Objectives: At the end of this lesson you shall be able to
• explain causes of failure of the components of exhaust system.
• Exhaust manifold
Exposure to extreme pressure and heat cycles can damage exhaust manifolds.
• Oxygen sensor
Oxygen sensor failure can lead to incorrect reading of exhaust gases.
• Catalytic converter
Catalytic converters can become blocked or choked, which can cause a noticeable lack of power, a smell of
Sulphur, or heat from the floor of the vehicle.
• Diesel Particulate Filter
DPFs can become clogged and may even need to be replaced in some circumstances. DPFs go through
which helps clear out the soot. The danger is that it can become clogged beyond the engine management’s
capabilities to clean it.
• Exhaust pipe
Checking for holes or signs of rust is required; any sign of rust may indicate a more serious problem within the
silencer.
• Silencer
Rust is the main culprit when it comes to exhaust damage or erosion.
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CITS : Automotive - Mechanic Diesel - Lesson 25 - 28
