2
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Wastegate control valve
3
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Turbocharger coolant return pipe
The turbocharger consists of two elements, a turbine and a compressor both installed on a single shaft and are contained within a turbocharger housing. The turbocharger and exhaust manifold are not a combined assembly and are supplied separately.
The turbocharger bearings are supplied, cooled and lubricated by oil from the engine via the oil supply tube. Oil is then returned to the oil pan via the oil return pipe. In addition the turbocharger is also cooled by engine coolant which is supplied from the engine and cooled down by the radiator.
The turbine element of the turbocharger uses the energy of the exhaust gas to drive the compressor. The compressor draws in air from the air cleaner, through the turbocharger which increases pressure and flow of air. Turbocharged air is then forced through the charge air cooler where air temperature is cooled before it reaches the intake manifold.
The turbocharger boost pressure is governed by means of a wastegate control valve. The wastegate redirects some of the exhaust gas past the turbine so over boosting does not occur. The wastegate control valve is controlled by a wastegate control solenoid which is preset during manufacture and must not be tampered with.
