Workshop Manual, TSD3450E, Issue 1 91
9
2800
Aspiration system 9
General information
The induction system of the engine is supplied with air under pressure by a turbocharger. The turbocharger is
driven by the energy of the exhaust gas.
Special thermal sleeves manufactured from stainless steel are fitted to the exhaust ports. These reduce the
amount of heat transferred to the cooling system and direct the thermal energy to the turbocharger.
The exhaust gas passes through the exhaust manifold and enters the turbine housing of the turbocharger. The
pressure of the exhaust gas causes the turbine rotor to rotate, the gas then leaves the engine through the
exhaust pipes. Exhaust pipes and exhaust silencers are fitted in accordance with the requirements of the
installation. An impeller at the other end of the turbine shaft supplies clean air to the engine at more than
atmospheric pressure. The air is drawn through the air cleaner and into the compressor housing which
contains the impeller. From the compressor housing the air is forced through the air-to-air charge cooler which
is integral with the radiator. The air is cooled as it flows through the charge cooler, this improves the
combustion efficiency. From the charge cooler the air is directed through ducts to the cylinder head and enters
the cylinders of the engine.
A restriction indicator is fitted next to the casing of the air filter to give a visual indication when the filter element
is dirty. The air filter needs no special maintenance, except for the procedures given in the User’s Handbook.
The engine breather is an integral part of the rocker cover. If the breather becomes blocked or damaged, the
assembly of the rocker cover should be renewed, refer to Operation 3-1.
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