Page 91 - Mechanic Diesel - TT
P. 91
MECHANIC DIESEL - CITS
Function
The atmospheric air enters the air cleaner (Fig 3) through the air entrance (1) and passes through the paper
element (2). The filtered clean air goes to the intake manifold entrance (3).
Intake manifold
The intake manifold is connected with air cleaner and cylinder head intake port of the cylinder head. It is allowing
the fresh air to flow from air cleaner to cylinder through inlet valve. The intake manifold is made of a cast iron or
aluminum.
1 Air supplied to an engine must be free from dirt as far as possible.
2 If any dirt entering the air it will act as an abrasive, hence abrasive wear there is will occur on piston rings,
cylinder walls, vales, bearing and other relative moving parts.
3 Under extreme condition the wear may become very much greater.
4 An air filter also called air cleaner is always install at the entrance of the inlet manifold.
Air cleaner
In order to keep the abrasive wear at the minimum is necessary to regular clean the air to ensure only clean, dust
free air is drawn into the engine further for optimum performance of the engine the air cleaner should be fully free
from dust and dirt and should offer no resistance at all to the incoming air.
Remove the air cleaner once in every week (1000 kms) Dismantle and clean thoroughly the bowl and the wire
mesh with the petrol (Use kerosene in absence of petrol). Fill in bowl with clean engine oil up to the mark and
assemble.
While cleaning the wire mesh filter, if small broken metallic pieces are found getting dislodged replace the same
with new one.
Do not overfill the bowl as this will result in smoky Exhaust
The air cleaner where need earlier attention if the operating condition are particularly dusty.
Turbo charger and its type
Turbocharger: Turbo charger is mounted on the engine. It increases the amount of air delivered to the engine
cylinder, thereby more fuel can be burnt which increases engine power. Whenever the density of air is less
78
CITS : Automotive - Mechanic Diesel - Lesson 25 - 28
