Perkins Phaser Series - General Description

18 ASPIRATION SYSTEM
General description
Warning! Turbochargers operate at high speed and
at high temperatures. Keep fingers, tools and
debris away from the inlet and outlet ports of the
turbocharger and prevent contact with hot surfaces.
A turbocharger (A), is fitted between the exhaust
and induction manifolds. The turbocharger is driven
by exhaust gases and passes air to the engine at
more than atmospheric pressure. It is lubricated by
oil from the main gallery. The oil passes through
the bearing housing of the turbocharger and returns
to the lubricating oil sump; arrows are included on
the illustration to indicate the typical oil flow.
Some turbochargers are fitted with a waste-gate
unit (B). This unit, which is controlled by boost
pressure, allows some of the exhaust gases to by-
pass the turbine rotor at higher engine speeds. With
this arrangement, the turbocharger can be designed
to be more effective at lower engine speeds.
PA180
A waste-gate guard (A1) is fitted to protect the
actuator rod (A2) of some engines.
Always use the manufacturers instructions and
specialist assistance to fit the service kit for the
turbocharger.
PA181
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18A.02 Perkins Phaser/1000 Series, April 1995