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Toyota Supra JZA80

Cylinder head installation

  1. Place cylinder head on cylinder block
    1. Place a new cylinder head gasket in position on the cylinder block.
      Be sure to install it correctly.
    2. Place the cylinder head in position on the cylinder head gasket.
  2. Install cylinder head bolts
    • The cylinder head bolts are tightened in 2 progressive steps (steps (c) and (f)).
    • If any of bolts break or deform, replace them.
    1. Apply a light coat of engine oil on the threads and under the heads of the cylinder head bolts.
    2. Install the 14 plate washers to each cylinder head bolt.
    3. Using a 10 mm bi-hexagon wrench, uniformly tighten the cylinder head bolts, in several passes, in the sequence shown.
      Torque: 34 N·m (350 kgf·cm, 25 ft·lbf)
      If any of the bolts do not meet the torque specification, replace the bolt.
    4. Mark the front of the cylinder head bolt head with paint.
    5. Retighten the cylinder head bolts by 90° in the numerical order shown in the illustration on previous page.
    6. Retighten cylinder head bolts by an additional 90° shown in the illustration on previous page.
    7. Check that the painted mark is now turned to the rear.
  3. Install camshafts
    1. Apply engine oil to the thrust portion of the camshaft.
    2. Place the camshaft on the cylinder head with the cam lobe facing up as shown.
    3. Place the No.3 and No.7 bearing caps in their proper location.
    4. Apply a light coat of engine oil on the threads and under the heads of the bearing cap bolts.
    5. Temporarily tighten these bearing cap bolts uniformly and alternately, in several passes, until the bearing caps are snug with the cylinder head.
    6. Apply MP grease to a new camshaft oil seal lip.
    7. Install the 2 oil seals to the camshafts.
    8. Clean the installed surfaces of the No.1 bearing cap and cylinder head with cleaner.
    9. Apply seal packing to the No.1 bearing cap as shown.
      Seal packing: Part No. 08826-00080 or equivalent
    10. Install the No.1, No.2, No.4, No.5 and No.6 bearing caps in their proper locations.
    11. Apply a light coat of engine oil on the threads and under the heads of the bearing cap bolts.
    12. Install and uniformly tighten the 14 bearing cap bolts on one side, in several passes, in the sequence shown.
      Torque: 20 N·m (200 kgf·cm, 14 ft·lbf)
    13. Using SST, push the 2 oil seals in as far as they can go.
      SST 09316-6001 1 (09316-00011, 09316-00051)
    14. Rotate the camshaft with a wrench at the hexagon position, bring the forward straight pin up.
    15. Loosen the 12 bearing cap bolts as shown, until they can be turned by hand; retighten, in several passes.
      Torque: 20 N·m (200 kgf·cm, 14 ft·lbf)
    16. Turn the camshaft 1/3 of revolution.
    17. Loosen the 8 bearing cap bolts as shown, until they can be turned by hand; retighten, in several passes.
      Torque: 20 N·m (200 kgf·cm, 14 ft·lbf)
    18. Turn the camshaft a further 1/3 of a revolution.
    19. Loosen the 8 bearing cap bolts as shown, until they can be turned by hand; retighten, in several passes.
      Torque: 20 N·m (200 kgf·cm, 14 ft·lbf)
  4. Check and adjust valve clearance (See page EM-4 )
    Turn the camshaft, and position the cam lobe upward, check and adjust the valve clearance.
  5. Install No.4 timing belt cover
    Install the timing belt cover with 4 bolts.
    Torque: 8.0 N·m (80 kgf·cm, 71 in.·lbf)
  6. Install camshaft timing pulleys
    1. Align the camshaft knock pin with the groove in the pulley, and slide on the pulley.
    2. Temporarily install the timing pulley bolt.
    3. Hold the hexagon portion of the camshaft with a wrench, and tighten the timing pulley bolt.
      Torque: 81 N·m (810 kgf·cm, 60 ft·lbf)
  7. Install No.1 and No.2 cylinder head covers
    1. Remove any old packing (FIPG) material.
    2. Apply seal packing to the cylinder head as shown in the illustration.
      Seal packing: Part No. 08826-00080 or equivalent
    3. Install the gaskets to the No.1 and No.2 cylinder head covers.
    4. Install the seal washers to the mounting bolts.
    5. Install the No.1 cylinder head cover with the 4 seal washers and 4 bolts.
      Torque: 5.5 N·m (55 kgf·cm, 49 in.·lbf)
    6. Install the No.2 cylinder head cover with the 4 seal washers and 4 bolts.
      Torque: 5.5 N·m (55 kgf·cm, 49 in.·lbf)
    7. Install the PCV valve.
    8. Install the cruise control actuator cable bracket and IAC valve pipe clamp with the 2 bolts.
  8. Install spark plugs
  9. Install ignition coils assemblies (See page IG-7 )
  10. Install timing belt (See page EM-21 )
  11. Install intake manifold and delivery pipe assembly
    Install a new gasket, the intake manifold, delivery pipe assembly and engine wire bracket with the 4 bolts and 2 nuts.
    Torque: 27 N·m (280 kgf·cm, 20 ft·lbf)
  12. Install fuel inlet pipe
    1. Connect the fuel inlet pipe with 2 new gaskets and the union bolt.
      Torque: 42 N·m (420 kgf·cm, 30 ft·lbf)
    2. Install the clamp bolt to the intake manifold.
  13. Install fuel pressure pulsation damper (See page SF-32 )
  14. Install pressure tank and VSV assembly
    Torque: 21 N·m (210 kgf·cm, 15 ft·lbf)
  15. Connect engine wire
    1. Install the engine wire protector to the intake manifold with the nut.
    2. Install the 2 ground straps to the intake manifold with the bolts.
    3. Connect these connectors and clamps:
      • VSV connector for EVAP
      • 6 injectors connectors
        The No.1, No.3 and No.5 injector connectors are dark gray, and the No.2, No.4 and No.6 injector connectors are gray.
      • 2 camshaft position sensor connectors
      • 3 engine wire clamps to injector holders
  16. Install air intake chamber assembly (See page SF-29 )
  17. Connect fuel return hose
  18. Install PS pump
    Torque: 58 N·m (590 kgf·cm, 43 ft·lbf)
  19. Install No.1 water bypass pipe and water outlet
    1. Install 2 new O-rings to the No.1 water bypass pipe.
    2. Apply soapy water to the O-rings.
    3. Install the No.1 water bypass pipe to the water pump.
    4. Install a new gasket and the water outlet with the 2 bolts.
      Torque: 21 N·m (210 kgf·cm, 15 ft·lbf)
    5. Connect the ECT sensor and sender gauge connectors.
    6. Connect the upper radiator hose to the water outlet.
  20. Install drive belt
    Install the drive belt by turning the drive belt tensioner clockwise.
  21. M/T:
    Install drive belt tensioner damper (See page EM-21 )
  22. Install exhaust manifold
    1. Place 2 new gaskets to the cylinder head facing the protrusion as shown.
    2. Install the exhaust manifold with 12 new nuts, in several passes, in the sequence shown.
      Torque: 39 N·m (400 kgf·cm, 29 ft·lbf)
  23. Install turbocharger (See page TC-20 )
This guide is based on the book edition Toyota (RM502U, 1997)

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