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Engine Mechanical (H4SO - 2.5L SOHC): Overhaul Subaru Outback BR

Mechanical 3 illustrations ~377 words

ASSEMBLY

  1. Install the front cushion rubber to the front mounting bracket. Tightening torque: 45 N.m (4.6 kgf-m, 33.2 ft-lb)
  2. Install the front cushion rubber to the engine mounting bracket. Tightening torque: 25 N.m (2.5 kgf-m, 18.4 ft-lb)

V-BELT TENSIONER ASSEMBLY AND IDLER PULLEY

Install in the reverse order of removal.

Tightening torque

25 N.m (2.5 kgf-m, 18.4 ft-lb)

Tightening torque

20 N.m (2.0 kgf-m, 14.8 ft-lb)

Scheme 152

Scheme 152: INSPECTION
Scheme 152: INSPECTION
  1. Check the V-belt for cracks, tear or wear.
  2. Remove the air intake duct. Ref. to «REMOVAL»(ref-371894-S28286124812010091900000) , Air Intake Duct.
  3. Check the V-belt tensioner assembly and idler pulley for deformation, cracks or other damages.
  4. Check that the V-belt tension indicator (A) is within the limit (B).

DISASSEMBLY

Note. Intake valve rocker assembly cannot be disassembled.

  1. Remove the exhaust valve rocker arm from the rocker shaft. NOTE: Keep all the removed parts in order for re-installing in their original positions.
  2. Remove the nut and adjusting screw from exhaust valve rocker.

Note. Intake valve rocker assembly cannot be disassembled.

  1. Install the adjusting screw and nut to the exhaust valve rocker.
  2. Insert the exhaust valve rocker arm to rocker shaft. NOTE: Valve rocker arms, and rocker shaft have identification marks. Make sure the parts with same markings are properly assembled.

INTAKE VALVE ROCKER ASSEMBLY

  1. If the roller or valve contact surface of valve rocker arm is worn or dented excessively, replace the valve rocker assembly.
  2. Check that the valve rocker arm roller rotates smoothly. If not, replace the valve rocker assembly.

Scheme 153

Scheme 153: EXHAUST VALVE ROCKER ASSEMBLY
Scheme 153: EXHAUST VALVE ROCKER ASSEMBLY

Scheme 154

Scheme 154
Scheme 154
  1. Measure the inner diameter of valve rocker arm and outer diameter of valve rocker shaft, and confirm the difference (oil clearance) between the two values. Clearance between arm and shaft: Standard 0.020 - 0.054 mm (0.0008 - 0.0021 in)
  2. If the oil clearance exceeds the limit, replace the valve rocker arm or shaft, whichever shows the greater amount of wear. Rocker arm inside diameter: 22.020 - 22.041 mm (0.8669 - 0.8678 in) Rocker shaft diameter: 21.987 - 22.000 mm (0.8656 - 0.8661 in)
  3. If the roller or valve contact surface of valve rocker arm is worn or dented excessively, replace the valve rocker arm.
  4. Check that the valve rocker arm roller rotates smoothly. If not, replace the valve rocker arm.

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