TIAGO

1.05L REVOTORQ ENGINE

Construction And Function:



Turbocharger is comprised of a compressor

and a turbine. The turbine and compressor

wheels are mounted on a common shaft. This

sub-assembly is known as the rotor. The rotor

is supported by journals housed in the Central

housing.



The exhaust gas driven turbine drives the

compressor, which draws in filtered air and

delivers it, pre-compressed, to the engine.



The turbocharger turbine consists of the

turbine wheel and turbine housing. The engine

exhaust gases are directed to the turbine via

turbine housing. The energy available in the

exhaust gases is converted into kinetic energy

by the turbine housing and is used to drive the

turbine wheel.



The compressor consists of the compressor

wheel and compressor housing. By rotation of

the compressor wheel, the air is drawn axially,

compressed in the compressor housing and

delivered radially at a higher pressure to the

intake manifold. Increase in pressure also

results in increase in temperature. To reduce

the compressed air temperature, most of the

turbocharged engines use after cooler / inter

cooler.



Westgate is a unit, which allows the use of a

smaller turbocharger to reduce lag while

preventing it from spinning too quickly at high

engine speeds. The wastegate is a valve that

allows the exhaust to bypass the turbine

blades. The wastegate senses the boost

pressure. If the pressure gets too high, it could

be an indicator that the turbine is spinning too

quickly, so the wastegate bypasses some of

the exhaust around the turbine blades,

allowing the blades to slow down



The boost pressure acts on the actuator

diaphragm, which is pre-stressed by a coil

spring. Once the boost pressure has overcome

the spring pre-load, the diaphragm pushes the

actuator control rod, which in-turn operates the

flap (by-pass valve), thus allowing to set the

boost pressure as required

Operation And Preventive Maintenance:

Good maintenance practices should be

observed, particularly regarding oil quality and its

filtration and air filtration. These areas are

important because of turbocharger's speed and

operating conditions. Proper operating procedures

and preventive maintenance practices give good

turbocharger service life and performance.

Years of experience has shown that the

largest percentage of turbocharger failures are

caused by lubrication problems such as oil lag,

restriction or lack of oil flow and foreign material in

the oil.

The second largest percentage is caused

by foreign objects entering the compressor /

turbine wheels

The

engine

manufacturer's

recommendations for operation and maintenance

shall be authoritative for the operation of

turbocharged engines. Special attention should be

paid to:

Following operating Recommendations



The engine should not be put under full load

immediately after start. We recommend the

engine to be run at idling speed for a short

time (One minute). Warm up the engine under

medium speed and load.



Revving the engine immediately after start can

force the turbocharger to operate at very high

speed with inadequate lubricating oil. A

turbocharger

running

with

inadequate

lubrication will undergo higher bearing wear.

Repeated occurrences will lead to premature

turbocharger failure.



Turbocharger operating temperatures and

speeds should be reduced before switching-off

the engine Turbocharger operates at speeds

and continuous temperatures that are much

higher than most other machines. When an

engine is run at maximum power / torque,

turbocharger speed and temperature are also

at maximum. Problems can be caused for

engine more so for turbocharger, when the

engine is shut off suddenly. This may require

operating the engine at no load condition and

at medium idle, while still maintaining full

engine oil pressure and airflow for effective

cooling.



The turbocharger needs to be pre-oiled after

an oil change or any service that involves oil

draining. Whenever the vehicle has not been

used for a long period, or operated at low

ambient temperatures. Crank the engine a few

times before allowing it to start. Then start the