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Cylinder Head: Installation

  1. Clean mating surfaces of cylinder head and crankcase so that they are free of oil, grease and dirt.
    NOTE: Apply head gasket sealant Three Bond 1201 or Dow Corning #92-024 to both sides of new cylinder head gasket. Install gasket quickly after applying sealant.
  2. Before installing cylinder heads, coat all nut and bolt threads with oil. Reverse removal procedure, tightening nuts and bolts in 3 successive steps. See Tightening Specifications table  for torque.
  3. After tightening all the cylinder head nuts and bolts, retighten the center nut (No. 1) to ensure it is correctly torqued.
    Fig 1: Cylinder Head Tightening Sequence
    G09332275Courtesy of SUBARU OF AMERICA, INC.

    Tighten all bolts to 47 ft. lbs. (64 N.m). 

    Fig 2: Crankcase Tightening Sequence
    G09332276Courtesy of SUBARU OF AMERICA, INC.

    Torque varies with bolt size. 

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