Cylinder Head: Assembly

Fig 1: Exploded View Of Cylinder Head

Courtesy of SUBARU OF AMERICA, INC.

1. Using the ST, install the valve oil seals to valve guides of cylinder head RH.
   CAUTION:

   • During work, place a waste cloth, etc. to avoid scratching the mating surface of the cylinder head RH.
   • Use special care not to damage the cylinder head RH and guide during work.
   • When installing the valve oil seal, press the ST with hands to install it and never drive the ST with a plastic hammer, otherwise the valve oil seal can be damaged.
   NOTE:

   • Use a new valve oil seal.
   • Apply engine oil to valve oil seal before installing.
   • The intake valve oil seals and exhaust valve oil seals are distinguished by their colors.

   Identification colors: 

   Intake [Gray]

   Exhaust [Green]

   • For installation of valve guide, refer to INSPECTION.  Ref. to MECHANICAL (H4DOTC)>Cylinder Head>INSPECTION>VALVE & VALVE GUIDE .

   ST 18261AA010 VALVE OIL SEAL GUIDE 

   Fig 2: Installing Valve Oil Seals To Valve Guides Of Cylinder Head RH

   Courtesy of SUBARU OF AMERICA, INC.
2. For cylinder head LH, install the valve oil seal in the same manner.
3. Install the valve spring seat, valve spring, valve spring retainer, valve and valve collet to the cylinder head RH.
   CAUTION: During work, place a waste cloth, etc. to avoid scratching the mating surface of the cylinder head RH.
   1. Set the valve spring seat, valve spring and valve spring retainer onto the cylinder head RH.
      NOTE: Be sure to install the valve spring with its close-coiled end facing the cylinder head side.
   2. Coat the valve stem of each valve with engine oil and insert the valve into valve guide.
      NOTE: When inserting the valve into valve guide, use special care not to damage the oil seal lip.
   3. Compress the valve spring and install the valve collet using ST.

   ST 0920287002000 REMOVER AND REPLACER 

   Fig 3: Compressing Valve Spring

   Courtesy of SUBARU OF AMERICA, INC.
4. Install the valve spring seat, valve spring, valve spring retainer, valve and valve collet to the cylinder head LH.
5. Lightly tap the valve spring retainer with a plastic hammer, and make sure that the valve collet is securely attached.
6. Install the stud bolts onto cylinder heads.

   Tightening torque: 

   18 N.m (1.8 kgf-m, 13.3 ft-lb)

   Fig 4: Locating Stud Bolts Onto Cylinder Heads

   Courtesy of SUBARU OF AMERICA, INC.
7. Install the chain cover securing bolt to the cylinder head LH.

Tightening torque: 

6.4 N.m (0.7 kgf-m, 4.7 ft-lb)

Fig 5: Locating Chain Cover Securing Bolt To Cylinder Head LH

Courtesy of SUBARU OF AMERICA, INC.