Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 154
IN(w/o STI)-15
Turbocharger
INTAKE (INDUCTION)
13) Disconnect the oil outlet hose from the oil outlet
pipe, and remove the turbocharger.
14) Remove the turbocharger stay.
B: INSTALLATION
1) Install the turbocharger stay.
Tightening torque:
T1: 33 N·m (3.4 kgf-m, 24.3 ft-lb)
T2: 42.5 N·m (4.3 kgf-m, 31.3 ft-lb)
2) Connect the oil outlet hose to the oil outlet pipe.
3) Connect the engine coolant hoses to the water
pipe.
4) Temporarily tighten the union bolts and flare
nuts which secure the oil inlet pipe to the turbo-
charger.
NOTE:
Use a new gasket.
(A) To cylinder head RH
(B) To cylinder block RH
(A) To cylinder head RH
(B) To cylinder block RH
IN-02310
IN-02859
(A)
(A)
(B)
T1
IN-02860
(A)
(A)
(B)
T2
IN-02310
IN-02938
IN-02937
IN(w/o STI)-16
Turbocharger
INTAKE (INDUCTION)
5) Tighten the union bolts and flare nuts which se-
cure the oil inlet pipe to the turbocharger.
CAUTION:
In order to prevent damaging the oil pipe on the
cylinder head side, fix the section (a) shown in
the figure when tightening the oil inlet pipe flare
nut, and avoid the part from rotating together
while tightening the nut.
Tightening torque:
T1: 16 N·m (1.6 kgf-m, 11.8 ft-lb)
T2: 20 N·m (2.0 kgf-m, 14.8 ft-lb)
6) Connect the air control hose (A), and install the
intake duct to the turbocharger.
Tightening torque:
3 N·m (0.3 kgf-m, 2.2 ft-lb)
7) Connect the engine coolant hoses to the coolant
filler tank.
8) Install the joint pipe to turbocharger.
NOTE:
Replace the gasket with a new part.
Tightening torque:
42.5 N·m (4.3 kgf-m, 31.3 ft-lb)
9) Lift up the vehicle.
10) Install the center exhaust pipe. <Ref. to
EX(STI)-9, INSTALLATION, Center Exhaust
11) Lower the vehicle.
12) Install the intercooler. <Ref. to IN(w/o STI)-12,
13) Connect the battery ground terminal.
14) Fill engine coolant. <Ref. to CO(w/o STI)-13,
FILLING OF ENGINE COOLANT, REPLACE-
(a)
IN-02955
IN-02939
T1
T2
IN-02940
(A)
IN-02936
IN-02935
IN-00203
IN(w/o STI)-17
Turbocharger
INTAKE (INDUCTION)
C: INSPECTION
1. WASTE GATE ACTUATOR
1) Remove the intercooler. <Ref. to IN(w/o STI)-12,
2) Remove the turbocharger upper cover.
3) Remove the boost hose (B) from the waste gate
actuator (A) of the turbocharger, and connect the
Mighty Vac to the waste gate actuator (A).
4) Pressurize slowly with the Mighty Vac, and mea-
sure the pressure when the control rod stroke (D)
becomes 2 mm (0.08 in). If it is not within the stan-
dard, replace the turbocharger assembly.
CAUTION:
Do not pressurize over 89.9 kPa (0.92 kgf/cm
2
,
13.0 psi) to prevent damaging the waste gate
actuator.
Operating pressure (control rod stroke 2 mm
(0.08 in)):
Standard
74.7 — 80.8 kPa (0.76 — 0.82 kgf/cm
2
, 10.8
— 11.7 psi)
5) After inspection, install the related parts in the
reverse order of removal.
Tightening torque:
7.5 N·m (0.8 kgf-m, 5.5 ft-lb)
2. OTHER INSPECTIONS
1) Check that the turbocharger and pipe have no
deformation, cracks or other damages.
2) Check that the hose and intake duct have no
cracks, damage or loose part.
3) Check that there are no oil leakage or water
leakage from the pipe attachment section.
(A) Waste gate actuator
(B) Boost hose
(C) Control rod
(D) Control rod stroke
EX-02662
(C)
(B)
(A)
IN-02941
(D)
IN(w/o STI)-18
Air By-pass Valve
INTAKE (INDUCTION)
8. Air By-pass Valve
A: REMOVAL
Disconnect the air by-pass pipe (A) and vacuum
hose (B) from the air by-pass valve, and remove
the air by-pass valve from the intercooler.
B: INSTALLATION
Install in the reverse order of removal.
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)
C: INSPECTION
1. AIR BY-PASS VALVE
1) Check that the air by-pass valve has no defor-
mation, cracks or other damages.
2) Connect the Mighty Vac to the nipple (A) of the
air by-pass valve.
3) Using the Mighty Vac, generate the negative
pressure to –93.3 kPa (–0.95 kgf/cm
2
, –13.5 psi).
Check that the Mighty Vac gauge needle holds 10
seconds without falling by –92.6 kPa (–0.94 kgf/cm
2
,
–13.4 psi).
4) Set a dial gauge to the end of valve rod of the air
by-pass valve.
5) Using the Mighty Vac, generate the negative
pressure, and check the pressure when dial gauge
needle (valve stroke) shows 0.5 mm (0.02 in). If it is
not within the standard, replace the air by-pass
valve.
Opening pressure (valve stroke 0.5 mm (0.02
in)):
Standard
–53.3 — –61.3 kPa (–0.54 — –0.63 kgf/cm
2
,
–7.73 — –8.89 psi)
6) Generate the additional negative pressure from
5), and check the pressure when dial gauge needle
(valve stroke) shows 7.5 mm (0.3 in). If it is not with-
in the standard, replace the air by-pass valve.
Full open pressure (valve stroke 7.5 mm (0.3
in)):
Standard
–93.4 — –108 kPa (–0.95 — –1.10 kgf/cm
2
,
–13.5 — –15.7 psi)
2. OTHER INSPECTIONS
Check that the vacuum hose and air by-pass pipe
have no cracks, damage or loose part.
IN-03076
(A)
(B)
IN-02604
(A)
IN-02605
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