Toyota 4Y 2006 Manual page 53

SST
Inspection:
lnspect for cracking in the cylinder head.
With color check (dye penetrant inspection), inspect the
combustion chambers, the intake ports, the exhaust ports, and
the lower and upper faces of the heads.
[Point 81
Disassembly:
Use the SST to disassemble the valve spring and valve.
SST 09202-76002-71
(09202-70020)
Disassembly:
Store the removed parts by sorting them out for each cylinder.
[Point 91
Inspection:
lnspect the oil clearance between the valve guide bushing and
the valve stem.
1. Measure the valve guide bushing inside diameter with a caliper
gauge.
Standard
IN: 8.010 to 8.030 mm (0.3154 to 0.3161 in.)
2. Measure the outside diameter of the valve stem
Standard
IN: 7.970 to 7.985 mm (0.3138 to 0.3144 in.)
EX: 7.965 to 7.980 mm (0.3136 to 0.3142 in.)
3.
Calculate the oil clearance.
Standard
IN: 0.025 to 0.060 mm (0.0010 to 0.0024 in.)
EX: 0.030 to 0.065 mm (0.0012 to 0.0026 in.)
Limit
IN: 0.10 mm (0.0039 in.)
EX: 0.12 mm (0.0047 in.)
If it exceeds the limit, replace the valve stem or the valve guide
bushing. Also, if necessary, grind the inside surface by using a
reamer to correct the oil clearance between the valve guide
bushing and the valve stem within the standard range.