Cylinder Head: Installation

2016 Subaru Legacy 2.5iSECTION Installation
WARNING: This page is about a different variant/trim than selected.
  1. Apply liquid gasket to the mating surface of cylinder block shown in the figure.
    NOTE:
    • Install within 5 min. after applying liquid gasket.
    • Do not apply liquid gasket excessively. If too much is applied, remove any liquid gasket that is squeezed out.

    Liquid gasket: 

    THREE BOND 1217G (K0877Y0100), THREE BOND 1217H or equivalent 

    Liquid gasket applying diameter: 

    3.5±1.0 mm (0.138±0.039 in) 

    • LH side
      Fig 1: Identifying Liquid Gasket Applying Area On Mating Surface Of Cylinder Block (LH Side)
      G10311020Courtesy of SUBARU OF AMERICA, INC.
    • RH side
      Fig 2: Identifying Liquid Gasket Applying Area On Mating Surface Of Cylinder Block (RH Side)
      G10311021Courtesy of SUBARU OF AMERICA, INC.
  2. Install the cylinder head gaskets LH and RH onto the cylinder block.
    NOTE: Use a new cylinder head gasket.
  3. Apply liquid gasket to the mating surface of cylinder head gasket shown in the figure.
    NOTE:
    • Install within 5 min. after applying liquid gasket.
    • Do not apply liquid gasket excessively. If too much is applied, remove any liquid gasket that is squeezed out.

    Liquid gasket: 

    THREE BOND 1217G (K0877Y0100), THREE BOND 1217H or equivalent 

    Liquid gasket applying diameter: 

    3.5±1.0 mm (0.138±0.039 in) 

    • LH side
      Fig 3: Identifying Liquid Gasket Applying Area On Mating Surface Of Cylinder Head Gasket (LH Side)
      G06649871Courtesy of SUBARU OF AMERICA, INC.
    • RH side
      Fig 4: Identifying Liquid Gasket Applying Area On Mating Surface Of Cylinder Head Gasket (RH Side)
      G05667866Courtesy of SUBARU OF AMERICA, INC.
  4. Attach the cylinder head to the cylinder block.
    CAUTION: Be careful not to scratch the mating surface of cylinder head and cylinder block.
  5. Tighten the cylinder head bolts.
    1. Apply a thin coat of engine oil to washers and cylinder head bolt threads.
    2. Mount the cylinder head onto the cylinder block, then tighten the bolts with a torque of 20 N.m (2.0 kgf-m, 14.8 ft-lb) in the order indicated in the figure.
    3. Tighten the bolts with a torque of 50 N.m (5.1 kgf-m, 36.9 ft-lb) in the order indicated in the figure.
    4. Loosen all the bolts by 180° in the reverse order of installing, and loosen them further by 180°.
    5. Tighten the bolts with torque of 20 N.m (2.0 kgf-m, 14.8 ft-lb) in numerical sequence as shown in the figure.
    6. Tighten the bolts (1) - (4) in the order indicated with a torque of 48 N.m (4.9 kgf-m, 35.4 ft-lb).
    7. Tighten the bolts (5) - (8) in the order indicated with a torque of 44 N.m (4.5 kgf-m, 32.5 ft-lb).
    8. Tighten all bolts 90° in the numerical order as shown in the figure.
    9. Tighten the bolt (1) - (4) by 45° in the numerical order.
      Fig 5: Identifying Cylinder Head Bolts Tightening Sequence
      G05667867Courtesy of SUBARU OF AMERICA, INC.
  6. Install the seal bolt shown in the figure.
    NOTE: Before installing seal bolts, apply a sealing material to bolt threads.

    Seal material: 

    THREE BOND 1324 (Part No. 004403042) or equivalent 

    Tightening torque: 

    6.4 N.m (0.7 kgf-m, 4.7 ft-lb) 

    Fig 6: Locating Camshaft Seal Bolt
    G05667861Courtesy of SUBARU OF AMERICA, INC.
  7. Install the camshaft. < Ref. to INSTALLATION , Camshaft. >
  8. Install the crank sprocket. < Ref. to INSTALLATION , Crank Sprocket. >
  9. Install the cam sprocket. < Ref. to INSTALLATION , Cam Sprocket. >
  10. Install the timing chain assembly. < Ref. to INSTALLATION , Timing Chain Assembly. >
  11. Install the chain cover. < Ref. to INSTALLATION , Chain Cover. >
  12. Install the crank pulley. < Ref. to INSTALLATION , Crank Pulley. >
  13. Install the engine to the vehicle. < Ref. to INSTALLATION , Engine Assembly. >
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.