Inspect Valve Stems And Guide Bushings; Inspect Valves - Toyota Celica 2000 Repair Manual

EM-50
ENGINE MECHANICAL CYLINDER HEAD

INSPECT VALVE STEMS AND GUIDE BUSHINGS

9.
Using a caliper gauge, measure the inside diameter of the
(a)
guide bushing.
Bushing inside diameter:
1 ZZ-FE 5.510 - 5.530 mm (0.21 69 - 0.2177 in.)
2ZZ-GE 5.500 - 5.518 mm (0.2165 - 0.2172 ln.)
AQ1478
{b) Using a micrometer, measure the diameter of the valve
stem.
Valve stem diameter:
1ZZ-FE
Intake 5.470- 5.485 mm (0.2154 - 0.2159 in.)
Exhaust 5.465 - 5.480 mm (0.2152 - 0.2157 in.)
2ZZ-GE
Intake 5.460 - 5.475 mm (0.21496 - 0.21555 in.)
Exhaust 5.445 - 5.470 mm (0.21 437 - 0.21535 in.)
Subtract the valve stem diameter measurement from the
{c)
guide bushing inside diameter measurement.
Standard oil clearance:
1ZZ-FE
Intake 0.025 - 0.060 mm (0.0010 - 0.0024 ln.)
Exhaust 0.030 - 0.065 mm (0.001 2 - 0.0026 in.)
2ZZ-GE
Intake 0.025 - 0.058 mm (0.00098 - 0.00228 in.)
Exhaust 0.030 - 0.063 mm (0.0011 8 - 0.00248 in.)
Maximum oil clearance:
1ZZ-FE
Intake 0.08 mm (0.0031 in.)
Exhaust 0.10 mm (0.0039 1n.)
2ZZ-GE
0.10 mm (0.0039 in.)
If the clearance is greater than maximum, replace the valve and
guide bushing.
10.

INSPECT VALVES

Check the valve is ground to the correct valve face angle.
(a)
Valve face angle: 44.5·
Check that the surface of the valve for wear.
(b)
If the valve face is worn, replace the valve.