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