Snowmobile Polaris 2006 - 2007 FS / FST. Instruction - part 24

 

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Snowmobile Polaris 2006 - 2007 FS / FST. Instruction - part 24

 

 

4.37

EFI / Ignition Systems

4

Rev. 1 07/2006

Turbocharger Assembly

18 F

T

.L

BS

. (24 N

M

)

4.38

EFI / Ignition Systems

Rev. 1 07/2006

FST Boost / Vacuum Reference Hose System

4.39

EFI / Ignition Systems

4

Rev. 1 07/2006

Wastegate Solenoid Pressure Testing

The wastegate solenoid allows the ECU to control the amount of
boost pressure routed to the wastegate actuator. In the event
where power to the solenoid is lost, the solenoid defaults so that
all of the boost pressure generated by the turbocharger is routed
to the wastegate actuator.

To test the solenoid’s function:

1.

Connect a Mity Vac™ tool to nozzle (A).

2.

Apply pressure to the solenoid with the Mity Vac™ hand
pump.

3.

Air should exit nozzle (B). No air should escape at (C).
Replace solenoid if functions do not pass test.

To test the solenoid’s venting function:

1.

Apply 12 Vdc to the electrical connector. An audible
“click” should be heard when voltage is connected and
disconnected. Replace solenoid if “click” is not heard.

2.

Apply pressure to (B) using a Mity Vac™ hand Pump.

3.

Air should exit the (C) nozzle. No air should exit (A).
Replace solenoid if function does not pass test.

Wastegate Actuator Pressure Testing

The wastegate actuator is a mechanical device that houses a
bellows, pre-load spring, and actuator arm. The wastegate
actuator is responsible for opening and closing the
turbocharger’s internal wastegate door. When the door is closed,
all of the engine’s exhaust gases are routed to the turbine. This
action increases turbine speed and boost pressure. When the
door is opened, some exhaust gas is allowed immediately exit
into the exhaust system, bypassing the turbine. This action
decreases turbine speed and boost pressure.

To test the wastegate actuator’s function:

NOTE:  Verify the condition and that the length of the
hose connected to the compressor housing and
wastegate solenoid and the hose connected to the
wastegate solenoid and wastegate actuator are
16cm.

1.

Attach a Mity Vac™ hand pump to the inlet nozzle on the
top of the actuator housing.

2.

Apply pressure.

3.

The actuator arm should begin moving at 6 - 6.5 psi.(41 -
45 kPA)

(A)

(B)

(C)

(A)

(B)

(C)

CAUTION

Do not tamper with the length of the actuator arm. The 

factory setting is critical to engine performance. 

Changing the length may cause poor engine 

performance or severe engine damage.

4.40

EFI / Ignition Systems

Rev. 1 07/2006

Turbocharger Inspection

The turbocharger uses the energy of expanding exhaust gases
exiting the engine to power a turbine and compressor. Intake air
is drawn into the compressor impeller and pre-compressed
before entering the combustion chamber. The intake compressor
is connected by a common shaft with the exhaust turbine. The
shaft’s bearings are lubricated with engine oil. The turbocharger
on the FST is not liquid-cooled. Maximum turbine / compressor
RPM can reach 200,000 RPM.

Because of the precise manufacturing tolerances and shaft
balancing, turbocharger disassembly is never recommended.
Never attempt to remove carbon build-up from the turbine
blades.

Replace the turbocharger assembly when:

• Damage to the compressor and/or turbine blades is 

found.

• The turbine/compressor shaft seal failure (Burning oil)

• The turbocharger makes a “howling” or “whining” 

sound when engine RPM is increased or decreased. 
(Bearing failure or compressor / turbine blade damage)

Charge Air Cooler (Intercooler) Inspection

The charge air cooler (CAC) is responsible for removing the
heat created by compressing the intake air charge. Removing
heat from the intake air charge creates a denser charge with more
oxygen molecules. This action increases power and decreases
the chance for pre-ignition.

Replace the CAC when:

• Damage to the fins or core is found.

• The CAC leaks or is plugged with foreign material.

Boost / Vacuum Reference Hose System 

(FST)

The reference system routes either boost or vacuum from the
port on the PTO intake track to the fuel pressure regulator and
purge valve. It is critical for engine performance that these hoses
are securely connected and not compromised (leaking or
kinked). A blocked, leaking or kinked reference hose may cause
an overboost trouble code.

A mechanical boost / vacuum gauge can provide better detail
than the boost gauge on located on the MFD gauge. When
installing a mechanical boost / vacuum gauge, replace the three-
port tee connector in the reference hoe system with a four-port
tee connector of the same size. Always verify that each hose is
securely connected.

WARNING

The turbocharger / exhaust system generates extreme 
heat and house rotating parts which can cause severe 

injury and burns. Never touch any part of the 

turbocharger / exhaust system while the engine is 

running or until the engine has been shut off and been 

allowed to sufficiently cool. Do not allow objects such 

as clothing, hair or body parts to come into contact with 

or enter the compressor or turbine housing while the 

engine is running.

 

 

 

 

 

 

 

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