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Home >> Infiniti >> 2018 >> Q70 5.6 Luxe, RWD >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical (5.6L) (Except Hybrid) >> Unit Disassembly And Assembly >> Cylinder Head >> Disassembly and Assembly >> Assembly

Disassembly and Assembly: Assembly

  1. Install valve guide (EXH), if removed.

    Replace with oversized [0.2 mm (0.008 in)] valve guide (EXH).

    1. Using the valve guide reamer (commercial service tool) (A), ream cylinder head valve guide (EXH) hole.
      GNSJPBIA0185Z-185Courtesy of NISSAN NORTH AMERICA, INC.

      Oversize (service) [0.2 mm (0.008 in)]:

      : Refer to Cylinder Head .
    2. Heat cylinder head to 110 to 130 deg. C (230 to 266 deg. F) by soaking in heated oil (A).
      GNSJPBIA0184Z-184Courtesy of NISSAN NORTH AMERICA, INC.
    3. Using the valve guide drift (commercial service tool), press valve guide (EXH) from camshaft side to the dimensions as shown in the figure, above.
      GNSJPBIA0186Z-186Courtesy of NISSAN NORTH AMERICA, INC.

      Projection (A)

      : Refer to Cylinder Head .
      WARNING: Cylinder head contains heat. When working, wear protective equipment to avoid getting burned.
    4. Using the valve guide reamer (commercial service tool) (A), apply reamer finish to valve guide (EXH).
      GNSJPBIA0185Z-185Courtesy of NISSAN NORTH AMERICA, INC.

      Standard

      : Refer to Cylinder Head .
  2. Install valve seat (EXH), if removed.

    Replace with oversize [0.5 mm (0.020 in)] valve seat (EXH).

    1. Ream cylinder head recess diameter (a) for service valve seat (EXH).
      GNSJPBIA0188Z-188Courtesy of NISSAN NORTH AMERICA, INC.

      Oversize (service) [0.5 mm (0.020 in)]:

      : Refer to Cylinder Head .
      • Be sure to ream in circles concentric to valve guide center. This enables valve to fit correctly.
    2. Heat cylinder head to 110 to 130 deg. C (230 to 266 deg. F) by soaking in heated oil (A).
      GNSJPBIA0184Z-184Courtesy of NISSAN NORTH AMERICA, INC.
    3. Provide valve seats (EXH) cooled well with dry ice. Force fit valve seat (EXH) into cylinder head.
      WARNING: Cylinder head contains heat. When working, wear protective equipment to avoid getting burned.
      CAUTION: Avoid directly touching cold valve seats.
    4. Using the valve seat cutter set (commercial service tool) or valve seat grinder, finish seat to the specified dimensions. Refer to Cylinder Head .
      G04073074Courtesy of NISSAN NORTH AMERICA, INC.
      CAUTION: When using the valve seat cutter, firmly grip cutter handle with both hands. Then, press on the contacting surface all around the circumference to cut in a single drive. Improper pressure on cutter or cutting many different times may result in staged valve seat.
    5. Using compound, grind to adjust valve fitting.
    6. Check again for normal contact. Refer to Inspection .
  3. Install new valve oil seals as per the following:
    1. Apply new engine oil on new valve oil seal joint and seal lip.
    2. Using the valve oil seal drift [SST: KV10115600 (J-38958)] (A), press fit valve seal to height (b) shown in figure, below.
      GNSJPBIA1367Z-367Courtesy of NISSAN NORTH AMERICA, INC.

      Height (b)

      Intake

      : 14.3 - 14.9 mm (0.563 - 0.587 in)

      Exhaust

      : 13.6 - 14.2 mm (0.535 - 0.559 in)
  4. Install valve.
    NOTE: Larger diameter valves are for intake side.
  5. Install oil filter (for VVEL ladder assembly) (1) in the direction shown in the figure below, if removed.
    GNSJPBIA2129Z-129Courtesy of NISSAN NORTH AMERICA, INC.
    • Check that the oil filter does not protrude from the upper surface of cylinder block (2) after installation.
  6. Install new cylinder head gaskets.
  7. Install cylinder head as per the following:
    CAUTION:
    • If cylinder head bolts are re-used, check their outer diameters before installation. Refer to Inspection .
    • Before installing cylinder head, inspect cylinder head distortion. Refer to Inspection .
    • Tighten cylinder head bolts in numerical order as shown in figure, below.
      Fig 1: Cylinder Head Bolt Tightening Sequence
      GNSJPBIA2145Z-145Courtesy of NISSAN NORTH AMERICA, INC.

    A

    : Bank 2

    B

    : Bank 1

    SYMBOL

    : Engine front
    • Use TORX socket.
    1. Apply new engine oil to threads and seat surfaces of cylinder head bolts.
    2. Tighten all cylinder head bolts.

      SYMBOL : 40 N.m (4.1 kg-m, 30 ft-lb)
    3. Tighten all cylinder head bolts (clockwise).

      Angle tightening: 75 degrees
    4. Completely loosen all cylinder head bolts.

      SYMBOL : 0 N.m (0 kg-m, 0 ft-lb)
      CAUTION: In step "d", loosen bolts in the reverse order of that indicated in the figure.
    5. Tighten all cylinder head bolts.

      SYMBOL : 40.0 N.m (4.1 kg-m, 30 ft-lb)
    6. Tighten all cylinder head bolts (clockwise).

      Angle tightening: 90 degrees
      GNSJPBIA0175Z-175Courtesy of NISSAN NORTH AMERICA, INC.
      CAUTION: Check the tightening angle using the angle wrench [SST: KV10112100 (BT8653-A)] (A). Never make judgment by visual inspection.
      • Check tightening angle indicated on the angle wrench indicator plate.
    7. Tighten all cylinder head bolts again (clockwise).

      Angle tightening: 90 degrees
  8. Install valve spring (with valve spring seat).
    • Install narrow pitch (B) end [paint mark (C)] to cylinder head side (valve spring seat side).
      GNSJPBIA0179Z-179Courtesy of NISSAN NORTH AMERICA, INC.

      A

      : Wide pitch

      SYMBOL

      : Cylinder head side

      Paint mark color

      Intake

      : Yellow

      Exhaust

      : Pink
  9. Install valve spring retainer.
  10. Install valve collet.
    GNSJPBIA1365Z-365Courtesy of NISSAN NORTH AMERICA, INC.
    • Compress valve spring with the valve spring compressor [SST: KV10116200 (J26336-A)] (A), the attachment [SST: KV10115900 (J26336-20)] (C) and the adapter [SST: KV10109220 (--)] (B). Install valve collet with a magnet hand.
      CAUTION: When working, take care not to damage valve lifter holes.
    • Tap valve stem edge lightly with plastic hammer after installation to check its installed condition.
  11. Install valve lifter.
    • Install it in the original position.
  12. Install in the reverse order of removal.
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