General Information (Except Sti): Removal & Installation Subaru Impreza GH

REPLACEMENT

Spark plug: Refer to "SPECIFICATION" for spark plug. Refer to ELECTRICAL , Impreza.

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1. Disconnect the ground cable from battery.
2. Remove the air cleaner case. Refer to «REMOVAL»(ref-357233-S04046461982010031100000) , Air Cleaner Case.
3. Remove the spark plug cords by pulling the boot. (Do not pull the cord itself.)
4. Remove the spark plug with a spark plug socket.
5. Install in the reverse order of removal.

Tightening torque: 21 N.m (2.1 kgf-m, 15.5 ft-lb)

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Scheme 126

1. Remove the battery. Refer to «REMOVAL»(ref-357234-S21509179942010031100000) , Battery.
2. Remove the spark plug cords by pulling the boot. (Do not pull the cord itself.)
3. Remove the spark plug with a spark plug socket.
4. Install in the reverse order of removal.

Tightening torque: 21 N.m (2.1 kgf-m, 15.5 ft-lb)

Scheme 127

1. Disconnect the ground cable from battery.
2. Remove the air cleaner case. Refer to «REMOVAL»(ref-357235-S04762520242010031100000) , Air Cleaner Case.
3. Disconnect the connector from ignition coil.
4. Remove the ignition coil. NOTE: Turn #3 ignition coil by 180 degrees to remove it.
5. Remove the spark plug with a spark plug socket.
6. Install in the reverse order of removal.

Tightening torque (Spark plug): 21 N.m (2.1 kgf-m, 15.5 ft-lb)

Tightening torque (Ignition coil): 16 N.m (1.6 kgf-m, 11.8 ft-lb)

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Scheme 129

1. Remove the battery and battery carrier.
2. Disconnect the air duct from the secondary air pump.
3. Remove the bolts attaching the air duct to the rocker cover (LH) and raise the air duct.
4. Disconnect the connector from ignition coil.
5. Remove the ignition coil. NOTE: Turn #4 ignition coil by 180 degrees to remove it.
6. Remove the spark plug with a spark plug socket.
7. Install in the reverse order of removal.

Tightening torque (Spark plug): 21 N.m (2.1 kgf-m, 15.5 ft-lb)

Tightening torque (Ignition coil): 16 N.m (1.6 kgf-m, 11.8 ft-lb)

Tightening torque (Air duct): 9 N.m (0.9 kgf-m, 6.6 ft-lb)

For fuel filter replacement procedure, refer to Fuel article.

1. Non-turbo model Refer to «FUEL FILTER»(ref-357240-S41874556342010031100000) .
2. Turbo model

Refer to FUEL FILTER .

REPLACEMENT OF ENGINE COOLANT

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1. Lift up the vehicle.
2. Remove the under cover.
3. Place a container under drain pipe.
4. Loosen and remove the drain plug to drain engine coolant into container.
5. For quick draining, open the radiator cap. CAUTION: If the engine coolant is spilt over exhaust pipe, wipe it off with cloth to avoid emitting smoke or causing a fire. NOTE: For turbo model, be sure to open the radiator cap on the filler tank side. Be careful not to spill coolant on the floor.
6. Drain the coolant from reservoir tank.
7. Tighten the radiator drain cock securely after draining coolant.
8. Pour cooling system conditioner through the filler neck. Cooling system protective agent: Cooling system conditioner (SOA345001)
9. Pour the engine coolant into the radiator (or the coolant filler tank on turbo models) up to the filler neck position.
10. Fill engine coolant into the reservoir tank up to "FULL" level. Recommended engine coolant: Refer to Recommended Materials information. Refer to «COOLANT»(ref-357229-S23641285062010031100000) , RECOMMENDED MATERIALS, Recommended Materials. Coolant capacity (fill up to "FULL" level): Refer to "Specifications information. Refer to «CAPACITY»(ref-357229-S06546000422010031100000) , Impreza. NOTE: The SUBARU Super Coolant contains anti-freeze and anti-rust agents, and is especially made for Subaru engines with an aluminum cylinder block. Always use SUBARU Super Coolant since other engine coolant may cause corrosion.
11. Close the radiator cap (or the coolant filler tank cap on turbo models), and start the engine. Race 5 to 6 times at 3,000 rpm or less, then stop the engine. (Complete this operation within 40 seconds.)
12. Wait for one minute after the engine stops, then open the radiator cap (or the coolant filler tank cap on turbo models). If the engine coolant level drops, add engine coolant into the radiator (or the coolant filler tank on turbo models) up to the filler neck position.
13. Perform the procedures 11) and 12) again.
14. Install the radiator cap (or the coolant filler tank cap on turbo models) and reservoir tank cap properly.
15. Start the engine and operate the heater at maximum hot position and the blower speed setting to "LO".
16. Run the engine at 2,000 rpm or less until radiator fan starts and stops. NOTE: Be careful with the engine coolant temperature gauge to prevent overheating. If the radiator hose becomes harden with the pressure of engine coolant, air bleeding operation seems to be almost completed.
17. Stop the engine and wait until the engine coolant temperature drops to 30°C (86°F) or less.
18. Open the radiator cap (or the coolant filler tank cap on turbo models). If the engine coolant level drops, add engine coolant into the coolant filler tank up to the filler neck position and the reservoir tank to "FULL" level.
19. Install the radiator cap (or the coolant filler tank cap on turbo models) and reservoir tank cap properly.
20. Set the heater setting to maximum hot position and the blower speed setting to "LO" and start the engine. Perform racing at 3,000 rpm or less. If the flowing sound is heard from heater core, repeat the procedures from step 16).

Note. During the operation, keep the reservoir tank filled with brake fluid to prevent entry of air. Operate the brake pedal slowly. For convenience and safety, two people should do the work. The required amount of brake fluid is approximately 500 m l (16.9 US fl oz, 17.6 lmp fl oz) for the entire brake system.

Scheme 131

1. Either jack-up the vehicle and place a rigid rack under it, or have the vehicle lifted.
2. Remove all the wheels.
3. Drain brake fluid from the reservoir tank.
4. Refill the reservoir tank with recommended brake fluid. Recommended brake fluid: Refer to "Recommended Materials" information. Refer to «FLUID»(ref-357229-S30284941522010031100000) , RECOMMENDED MATERIALS, Recommended Materials. Perform the same procedure as for bleeding the brake line, until new brake fluid comes out from vinyl tube. Refer to «PROCEDURE»(ref-357245-S11747967432010031100000) , Air Bleeding. NOTE: Perform brake fluid replacement starting in the order from the farthest wheel cylinder from the master cylinder.
5. Install one end of a vinyl tube onto the air bleeder and insert the other end of the tube into a container to collect the brake fluid.
6. Instruct your co-worker to depress the brake pedal slowly two or three times and then hold it depressed.
7. Loosen the bleeder screw approximately 1/4 turn until a small amount of brake fluid drains into the container, and then quickly tighten the screw.
8. Repeat steps 6 and 7 until there are no air bubbles in drained brake fluid and new fluid flows through vinyl tube. NOTE: Add brake fluid as necessary while performing the air bleed operation, in order to prevent the tank from running short of brake fluid.
9. After completing the bleeding operation, hold the brake pedal depressed and tighten the screw and install bleeder cap. Tightening torque: 8 N.m (0.8 kgf-m, 5.9 ft-lb)
10. Bleed air from each wheel cylinder by following steps from 5) to 9).
11. Depress the brake pedal with a force of approx. 294 N (30 kgf, 66 lbf) and hold it there for approx. 20 seconds. At this time check the pedal to see if it makes any unusual movement. Visually inspect the bleeder screws and brake pipe joints to confirm there is no fluid leakage.

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Scheme 133

1. Jack-up the vehicle and support it with rigid racks. Remove the wheels.
2. Visually check the pad thickness through inspection hole of disc brake assembly. Replace the pad if necessary. NOTE: When replacing a pad, always replace the pads for both the left and right wheels at the same time. Also replace the pad clips if they are twisted or worn. Front (back metal not included) PAD THICKNESS CHART Pad thickness mm (in) Standard 11 (0.43) Wear limit 1.5 (0.059) Rear (back metal not included) PAD THICKNESS CHART Pad thickness mm (in) Standard 9.0 (0.354) Wear limit 1.5 (0.059)
3. Check the disc rotor, and correct or replace if it is damaged or worn. Front DISC ROTOR THICKNESS CHART Disc rotor thickness mm (in) Standard 24 (0.94) Wear limit 22 (0.87) Rear DISC ROTOR THICKNESS CHART Disc rotor thickness mm (in) Standard 10 (0.39) Wear limit 8.5 (0.33)
4. Remove the caliper body. Refer to «FRONT DISC BRAKE ASSEMBLY»(ref-357245-S21036081422010031100000) . Refer to «REAR DISC BRAKE ASSEMBLY»(ref-357245-S37850973812010031100000) .
5. Tighten the wheel nuts to secure disc rotor.
6. Set a dial gauge at a point of 10 mm (0.39 in) or less from outer periphery of the rotor, and then measure the disc rotor runout.

Disc rotor runout limit

Front: 0.050 mm (0.0020 in)

Rear: 0.050 mm (0.0020 in)

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1. Remove the brake drum and check that there is no fluid leakage from the wheel cylinder. If fluid leaks are found in the wheel cylinder, check the wheel cylinder and replace it.
2. Inspect the brake shoes for damage or deformation and check the brake linings for wear. NOTE: Always replace both leading and trailing brake shoes for the left and right wheels at the same time. When replacing either the left or the right brake assembly, always replace the leading shoe and the trailing shoe of one side. Thickness of brake lining (except for back metal): Standard: 4.5 mm (0.177 in) Service limit: 1.5 mm (0.059 in)
3. Check the brake drum for wear, dents or other damage.

If the inside surface of the brake drum is streaked, correct the surface with emery cloth (#200 or more). If it is unevenly worn or tapered, or the outer surface of the brake drum is damaged, repair or replace it.

Brake drum inside diameter

Standard: 254 mm (10.000 in)

Service limit: 256 mm (10.08 in)

If the deformation or wear of back plate, shoe, etc. is noticeable, replace problem parts.

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