Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 153

IN(w/o STI)-11

Intake Duct

INTAKE (INDUCTION)

5. Intake Duct

A: REMOVAL

1) Disconnect the ground cable from battery.

2) Remove  the  intake  manifold.  <Ref.  to  FU(w/o

STI)-18, REMOVAL, Intake Manifold.>

3) Remove  the  sensor,  engine  harness  and  fuel

pipe  from  the  intake  manifold.  <Ref.  to  FU(w/o

STI)-26, DISASSEMBLY, Intake Manifold.>

4) Remove the intake duct from intake manifold.

B: INSTALLATION

Install in the reverse order of removal.
Tightening torque:

17 N·m (1.7 kgf-m, 12.5 ft-lb)

C: INSPECTION

Check  that  the  intake  duct  has  no  deformation,

cracks or other damages.

IN-00203

IN-02505

IN(w/o STI)-12

Intercooler

INTAKE (INDUCTION)

6. Intercooler

A: REMOVAL

1) Disconnect the air by-pass pipe (A) and vacuum

hose (B) from the air by-pass valve.

2) Loosen  the  clamp  (C)  which  holds  the  intake

duct to intercooler.

3) Remove the bolts which secure the intercooler to

the turbocharger.

4) Remove the bolts which secure the intercooler to

the intercooler stay, and remove the intercooler.

5) Remove  the  brake  booster  vacuum  hose  from

the clip (A), and remove the intercooler stay.

B: INSTALLATION

Install in the reverse order of removal.
NOTE:

• Use new O-rings.

• Be careful not to pinch the O-ring.
Tightening torque:

16 N·m (1.6 kgf-m, 11.8 ft-lb)

Tightening torque:

3 N·m (0.3 kgf-m, 2.2 ft-lb)

IN-03069

(C)

(A)

(B)

IN-03070

IN-03071

IN-03072

(A)

IN-03073

IN-03074

IN-03070

IN-03075

IN(w/o STI)-13

Intercooler

INTAKE (INDUCTION)

C: DISASSEMBLY

1) Remove the air by-pass valve from intercooler.

D: ASSEMBLY

Assemble in the reverse order of disassembly.
NOTE:

• Use new O-rings.

• Be careful not to pinch the O-ring.
Tightening torque:

6.5 N·m (0.7 kgf-m, 4.8 ft-lb)

E: INSPECTION

1) Check that the intercooler has no deformation,

cracks or other damages.

2) Check  that  the  vacuum  hose,  air  by-pass  pipe

and intake duct have no cracks, damage or loose

part.

IN-02094

IN(w/o STI)-14

Turbocharger

INTAKE (INDUCTION)

7. Turbocharger

A: REMOVAL

1) Disconnect the ground cable from battery.

2) Lift up the vehicle.

3) Drain approximately 3.0 L (3.2 US qt, 2.6 Imp qt)

of  coolant.  <Ref.  to  CO(w/o  STI)-13,  DRAINING

OF ENGINE COOLANT, REPLACEMENT, Engine

Coolant.>

4) Lower the vehicle.

5) Remove the intercooler. <Ref. to IN(w/o STI)-12,

REMOVAL, Intercooler.>

6) Remove  the  center  exhaust  pipe.  <Ref.  to

EX(STI)-8, REMOVAL, Center Exhaust Pipe.>

7) Lower the vehicle.

8) Remove the joint pipe from the turbocharger.

9) Disconnect the engine coolant hoses from cool-

ant filler tank.

10) Disconnect the air control hose (A), and loosen

the clamp holding the intake duct to the turbocharg-

er.

11) Remove the oil inlet pipe from the turbocharg-

er.
CAUTION:

In order to prevent damaging the oil pipe on the

cylinder head side, fix the section (a) shown in

the figure when loosing the oil inlet pipe flare

nut, and avoid the part  from  rotating  together

while loosening the nut.

12) Disconnect  the  engine  coolant  hose  from  the

water pipe.

IN-00203

IN-02935

IN-02936

IN-02940

(A)

(a)

IN-02955

IN-02937

IN-02938