Using SST and a hammer, tap out the guide bushing. SST 09201-10000 (09201-01060), 09950-70010 (09951-07100)
Using a caliper gauge, measure the bushing bore diameter of the cylinder head.
Select a new guide bushing (STD or O/S 0.05). Both intake and exhaust
Bushing bore diameter mm (in.)
10.985 - 11.006 (0.4350 - 0.4333)
11.035 - 11.056 (0.4344 - 0.4353)
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.
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.
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)