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Toyota Supra JZA80

Cylinder head replacement

Replace valve guide bushings

  1. Using SST and a hammer, tap out the guide bushing.
    SST 09201-10000 (09201-01060), 09950-70010 (09951-07100)
  2. Using a caliper gauge, measure the bushing bore diameter of the cylinder head.
  3. Select a new guide bushing (STD or O/S 0.05).
    Both intake and exhaust
    Bushing bore diameter mm (in.) Bushing size
    10.985 - 11.006 mm (0.4325 - 0.4333 in.) Use STD
    11.035 - 11.056 mm (0.4344 - 0.4353 in.) Used O/S 0.05
    If the bushing bore diameter of the cylinder head is greater than 11.006 mm (0.4333 in.), machine the bushing bore to the following dimension:
    11.035 - 11.056 mm (0.4344 - 0.4353 in.)
    If the bushing bore diameter of the cylinder head is greater than 11.056 mm (0.4353 in.), replace the cylinder head.
  4. Using SST and a hammer, tap in a new guide bushing to the specified protrusion height.
    SST 09201-10000 (09201-01060), 09950-70010 (09951-07100) Protrusion height:
    Intake 12.3 - 12.7 mm (0.484 - 0.500 in.)
    Exhaust 11.4 - 11.8 mm (0.449 - 0.465 in.)
    Different bushings are used for the intake and exhaust.
  5. Using a sharp 6 mm reamer, ream the guide bushing to obtain the standard specified clearance (See page EM-35 ) between the guide bushing and valve stem.
This guide is based on the book edition Toyota (RM502U, 1997)

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