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Engine Mechanical (H4SO) (Except Sti): Adjustments Subaru Impreza GH

Mechanical 26 illustrations ~1471 words

ADJUSTMENT

CAUTIONIf engine oil is spilt onto the exhaust pipe, wipe it off with cloth to avoid emission of smoke or causing a fire.

Note. Adjustment of valve clearance should be performed while engine is cold.

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  1. Set #1 cylinder piston to top dead center of compression stroke by rotating the crank pulley clockwise using the socket wrench. NOTE: When the arrow mark (A) on cam sprocket LH is at the top position, the #1 cylinder piston is at top dead center of the compression stroke.
  2. Adjust the #1 cylinder valve clearance. Loosen the valve rocker nut and screw. Set a suitable thickness gauge. While noting the valve clearance, tighten the valve rocker adjusting screw. When the specified valve clearance is obtained, tighten the valve rocker nut. NOTE: Insert a thickness gauge in a direction as horizontal as possible with respect to the valve stem end face. Lift up the vehicle and adjust the exhaust valve clearances. Valve clearance (adjustment value): Intake 0.20±0.04 mm (0.0079±0.0016 in) Exhaust 0.25±0.04 mm (0.0098±0.0016 in) Tightening torque: 9.75 N.m (1.0 kgf-m, 7.2 ft-lb)
  3. Adjust the valve clearance in #3, #2 and #4 cylinder in the same adjustment procedure as #1 cylinder in this order. NOTE: Be sure to set the cylinder pistons to their respective top dead centers on compression stroke before adjusting valve clearances. By rotating the crank pulley clockwise every 180° from the state that #1 cylinder piston is on the top dead center of compression stroke, #3, #2 and #4 cylinder pistons come to the top dead center of compression stroke in this order.
  4. Ensure the valve clearances of each cylinder are within specifications. If necessary, readjust the valve clearances.
  5. After measurement, install the related parts in the reverse order of removal.

Note. Use a new rocker cover gasket.

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Scheme 349: REMOVAL
Scheme 349: REMOVAL

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  1. Set the vehicle on a lift.
  2. Change the bolt installation position from (A) to (B), then open the front hood completely. Tightening torque: 7.5 N.m (0.8 kgf-m, 5.5 ft-lb)
  3. Remove the V-belt covers.
  4. Collect the refrigerant from A/C system. Refer to «PROCEDURE»(ref-357257-S33384670342010031100000) , Refrigerant Recovery Procedure.
  5. Release the fuel pressure. Refer to «RELEASING OF FUEL PRESSURE»(ref-357240-S31331770972010031100000) , PROCEDURE, Fuel.
  6. Remove the battery. Refer to «REMOVAL»(ref-357234-S21509179942010031100000) , Battery.
  7. Remove the air intake duct, air cleaner case and air intake chamber. Refer to «REMOVAL»(ref-357233-S32244127582010031100000) , Air Intake Duct. Refer to «REMOVAL»(ref-357233-S04046461982010031100000) , Air Cleaner Case. Refer to «REMOVAL»(ref-357233-S01318946012010031100000) , Air Intake Chamber.
  8. Remove the under cover.
  9. Remove the radiator from vehicle. Refer to «REMOVAL»(ref-357238-S20340070792010031100000) , Radiator.
  10. Disconnect the A/C pressure hoses from A/C compressor. Refer to «REMOVAL»(ref-357257-S33730063252010031100000) , Hose and Pipe.
  11. Remove the air intake chamber stay.
  12. Disconnect the following connectors and cables. Disconnect the front oxygen (A/F) sensor connector (A) and rear oxygen sensor connector (B) and remove the clip (C) fastening the harness. Remove the bolt, and disconnect the engine harness connector from the bulkhead harness connector and rear engine hanger. Generator connector and terminal A/C compressor connector Power steering pump switch connector
  13. Disconnect the following hoses. Brake booster vacuum hose Heater inlet and outlet hoses
  14. Remove the power steering pump. Remove the front side belts. Refer to «FRONT SIDE BELT»(ref-357236-S39328741062010031100000) , REMOVAL, V-belt. Remove the bolts which secure the power steering pump to the bracket. Place the power steering pump on the right side wheel apron.
  15. Lift up the vehicle.
  16. Remove the front and center exhaust pipes. Refer to «REMOVAL»(ref-357254-S15303422132010031100000) , Front Exhaust Pipe.
  17. Disconnect the ground cable on the engine side.
  18. Remove the bolts and nuts which hold the lower side of transmission to the engine. AT MODEL MT MODEL
  19. Remove the nuts which secure the engine mounting to the front crossmember.
  20. Separate the torque converter clutch from the drive plate. (AT model) Lower the vehicle. Remove the service hole plug. Insert the wrench into the crank pulley bolt and rotate the crank pulley to remove the bolts which hold torque converter clutch to drive plate.
  21. Remove the pitching stopper.
  22. Disconnect the fuel delivery hose (A) and evaporation hose (B). Disconnect the quick connector of the fuel delivery hose by pushing the ST in the direction of the arrow. ST 42099AE000 QUICK CONNECTOR RELEASE Remove the clip and disconnect the evaporation hose from the pipe. CAUTION: Be careful not to spill fuel. Catch the fuel from hoses using a container or cloth.
  23. Support the engine with a lifting device and wire ropes.
  24. Support the transmission with a garage jack. CAUTION: Be sure to always perform this work, in order to prevent the transmission from lowering for its own weight.
  25. Separation of engine and transmission CAUTION: Before removing the engine away from transmission, check to be sure no work has been overlooked. Remove the starter. Refer to «REMOVAL»(ref-357234-S14658303492010031100000) , Starter. Attach the ST to the torque converter clutch case. (AT model) ST 498277200 STOPPER SET Remove the bolts which hold upper side of transmission to engine. AT MODEL MT MODEL
  26. Remove the engine from vehicle. Slightly raise the engine. Raise the transmission with garage jack. Move the engine horizontally until main shaft is withdrawn from clutch cover. (MT model) Slowly move the engine away from engine compartment. NOTE: Be careful not to damage adjacent parts or body panels with crank pulley, oil level gauge, etc.
  27. Remove the engine mounting from the engine.

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  1. Install the engine mounting onto the engine. Tightening torque: 35 N.m (3.6 kgf-m, 25.8 ft-lb)
  2. Apply a small amount of grease to splines of main shaft. (MT model) Grease: NICHIMOLY N-130 or equivalent
  3. Position the engine in engine compartment and align it with transmission. NOTE: Be careful not to damage adjacent parts or body panels with crank pulley, oil level gauge, etc.
  4. Tighten the bolts which hold upper side of transmission to engine. Tightening torque: 50 N.m (5.1 kgf-m, 36.9 ft-lb) AT MODEL MT MODEL
  5. Remove the lifting device and wire ropes.
  6. Remove the garage jack.
  7. Install the pitching stopper. Tightening torque: T1: 50 N.m (5.1 kgf-m, 36.9 ft-lb) T2: 58 N.m (5.9 kgf-m, 42.8 ft-lb)
  8. Remove the ST from torque converter clutch case. (AT model) NOTE: Be careful not to drop the ST into the torque converter clutch case when removing the ST. ST 498277200 STOPPER SET
  9. Install the starter. Refer to «INSTALLATION»(ref-357234-S36592124982010031100000) , Starter.
  10. Install the torque converter clutch to drive plate. (AT model) Insert the wrench into the crank pulley bolt and rotate the crank pulley to install the bolts which hold torque converter clutch to drive plate. NOTE: Be careful not to drop bolts into the torque converter clutch case. Tightening torque: 25 N.m (2.5 kgf-m, 18.4 ft-lb) Install the service hole plug.
  11. Install the power steering pump. Install the power steering pump. Tightening torque: Refer to " «COMPONENT»(ref-357236-S36432571522010031100000) " of "Power Steering" for the tightening torque. Refer to «COMPONENT»(ref-357258-S12059879692010031100000) , General Description. Connect the power steering pump switch connector. Install and adjust the front side belt. Refer to «FRONT SIDE BELT»(ref-357236-S39328741062010031100000) , INSTALLATION, V-belt.
  12. Lift up the vehicle.
  13. Install the bolts and nuts which hold lower side of the transmission to engine. Tightening torque: 50 N.m (5.1 kgf-m, 36.9 ft-lb) AT MODEL MT MODEL
  14. Install the nuts which hold the engine mounting to the crossmember. Tightening torque: 85 N.m (8.7 kgf-m, 62.7 ft-lb)
  15. Connect the ground cable. Tightening torque: 7.5 N.m (0.8 kgf-m, 5.5 ft-lb)
  16. Install the front and center exhaust pipe. Refer to «INSTALLATION»(ref-357254-S20749004742010031100000) , Front Exhaust Pipe.
  17. Lower the vehicle.
  18. Connect the following hoses. Fuel delivery hose and evaporation hose Heater inlet and outlet hoses Brake booster vacuum hose
  19. Connect the following connectors and terminals. Front oxygen (A/F) sensor connector Rear oxygen sensor connector Engine harness connectors Tightening torque: 6.4 N.m (0.7 kgf-m, 4.7 ft-lb) Generator connector and terminal Tightening torque: 15 N.m (1.5 kgf-m, 11.1 ft-lb) A/C compressor connector
  20. Install the air intake chamber stay. Tightening torque: 16 N.m (1.6 kgf-m, 11.8 ft-lb)
  21. Install the A/C pressure hoses. Refer to «INSTALLATION»(ref-357257-S30210735142010031100000) , Hose and Pipe.
  22. Install the radiator to vehicle. Refer to «INSTALLATION»(ref-357238-S34746890002010031100000) , Radiator.
  23. Install the air intake duct, air cleaner case and air intake chamber. Refer to «INSTALLATION»(ref-357233-S04808498492010031100000) , Air Intake Duct. Refer to «INSTALLATION»(ref-357233-S17998210252010031100000) , Air Cleaner Case. Refer to «INSTALLATION»(ref-357233-S09562650492010031100000) , Air Intake Chamber.
  24. Install the under cover.
  25. Install the battery. Refer to «INSTALLATION»(ref-357234-S20300629692010031100000) , Battery.
  26. Fill engine coolant. Refer to «FILLING OF ENGINE COOLANT»(ref-357238-S17669780692010031100000) , REPLACEMENT, Engine Coolant.
  27. Check the ATF level and replenish it if necessary. (AT model) Refer to «INSPECTION»(ref-357244-S25560399872010031100000) , Automatic Transmission Fluid.
  28. Charge the A/C system with refrigerant. Refer to «PROCEDURE»(ref-357257-S32465084432010031100000) , Refrigerant Charging Procedure.
  29. Install the V-belt cover. Tightening torque: 13 N.m (1.3 kgf-m, 9.6 ft-lb)
  30. Change the bolt installation position from (B) to (A), then close the front hood.

Tightening torque

7.5 N.m (0.8 kgf-m, 5.5 ft-lb)

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