Exhaust Turbocharger/Manifold Module - Volkswagen 2004 Jetta Introduction Manual

Exhaust Turbocharger/Manifold Module

To conserve space and improve
performance and serviceability, the exhaust
manifold and turbine housing have been
combined into a single module. Special
emphasis was placed on easy removal and
installation of the exhaust manifold and the
close-coupled catalytic converter.
The turbine shaft mount is integrated into
the compressor housing. The air intake
includes connections for crankcase and
ACF ventilation. A silencer reduces
pressure pulsation noises.
Boost pressure is controlled by a
Wastegate Bypass Regulator Valve N75. A
Turbocharger Recirculating Valve N249
prevents "overbraking" of the turbine when
the engine is in overrun with the throttle
valve closed and boost pressure still
present. The Wastegate Bypass Regulator
Valve N75 and the Turbocharger
Recirculating Valve N249 are located on the
turbocharger.
Coolant Inlet From
Engine Block
332_024
Engines
Crankcase Breather
Connection
Coolant Flow to Radiator or
From Auxiliary Water Pump
ACF Connection
Pressurized Oil Inlet
Turbocharger
Recirculating Valve
N249
41