2006 DODGE RAM SRT-10 Service Repair Manual

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Page 2161 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual TURBOCHARGER
DESCRIPTION
The turbocharger is an exhaust-driven supercharger
which increases the pressure and density of the air
entering the engine. With the increase of air entering
the engine, more

Page 2162 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual OPERATION
Exhaust gas pressure and energy drive the turbine,
which in turn drives a centrifugal compressor that
compresses the inlet air, and forces the air into the
engine through the charge air cool

OPERATION
Exhaust gas pressure and energy drive the turbine,
which in turn drives a centrifugal compressor that
compresses the inlet air, and forces the air into the
engine through the charge air cooler and plumbing.
Since heat is a by-product of this compression, the air
must pass through a charge air cooler to cool the
incoming air and maintain power and efficiency.
Increasing air flow to the engine provides:
Improved engine performance
Lower exhaust smoke density
Improved operating economy
Altitude compensation
Noise reduction.
The turbocharger features a wastegate , which regu-
lates intake manifold air pressure and prevents over
boosting at high engine speeds and loads. When the
wastegate valve is closed, all of the exhaust gases
flow through the turbine wheel. As the boost pressure
(compressor outlet ) increases, the boost pressure is
fed to the wastegate actuator via a wastegate signal
line. When sufficient boost pressure is achieved, the
boost pressure applied to the wastegate diaphragm
overcomes spring pressure and moves an actuator
rod to open an exhaust bypass valve. When exhaust
gas is diverted from the turbine wheel, turbine shaft
speed is limited which reduces compressor wheel
speed, thereby limiting boost pressure.
The turbocharger wastegate system incorporates, an
Electronically Controlled Wastegate Command Valve,
to control boost pressure. The command valve is
located on the turbocharger compressor housing.
When the command valve is not actuated (no current supplied to the valve), apassage in the valve allows the
wastegate signal line to be supplied with boost pressure. This allows boost pressure to be mechanically regulated
by the wastegate as in a conventional wastegated system.
When the engine control module (ECM) provides a pulse width modulated (PWM) signal to the command valve,
boost pressure is bypassed away from the wastegate signal line through a drilling in the turbocharger compressor
housing. The internal drilling bleeds boost pressure back to the turbocharger compressor inlet (low pressure). Actu-
ating the command valve, (bypassing the boost pressure signal to the wastegate) allows the engine to operate at a
higher boost than would be achieved if the wastegate were allowed to operate normally.
Actuating the command valve does not increase boost pressure if the boost pressure is below the wastegate actua-
tor setting. With the command valve actuated, maximum boost pressure at a given operating condition will vary
based on ambient atmospheric pressure and temperature.

Page 2163 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual The turbocharger is lubricated by engine oil that is
pressurized, cooled, and filtered. The oil is delivered to
the turbocharger by a supply line that is tapped into
the oil filter head. The oil trave

Page 2164 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual REMOVAL
TURBOCHARGER
1. Disconnect the battery negative cables.
2. Raise vehicle on hoist.
3. Disconnect the exhaust pipe from the turbocharger
elbow (1) (Refer to 11 - EXHAUST SYSTEM/EX-
HAUST PIPE -

Page 2165 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual TURBOCHARGER OIL DRAIN TUBE
NOTE: If oil is present on either the inlet or
exhaust side of the turbo charger, check the
charge air cooler for evidence of oil. Clean charge
air cooler of any oil before

Page 2166 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual 4. Measure the turbocharger axial end play:
a. Install a dial indicator as shown . Zero the indi-
cator at one end of travel.
b. Move the impeller shaft fore and aft and record
the measurement. Allowa

Page 2167 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual NOTE: Always use a new clamp when installing
the exhaust elbow.
4. Install the exhaust elbow (1)
5. Reinstall the exhaust system on the exhaust hang-
ers.
6. Connect the exhaust pipe to the turbocharg

Page 2168 of 5267

DODGE RAM SRT-10 2006 Service Repair Manual WASTEGATE - ELECTRONIC ACTUATOR
REMOVAL
1. Disconnect battery negative cable.
2. Remove air inlet tube.
3. Disconnect wastegate command valve connector.
4. Remove wastegate command valve.
5. Inspect w

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