CYLINDER HEAD (4A–FE) - CelicaTech
CYLINDER HEAD (4A–FE) - CelicaTech CYLINDER HEAD (4A–FE) - CelicaTech
EM–94ENGINE MECHANICAL–Cylinder Head (4A–FE)5. INSPECT VALVE STEMS AND GUIDE BUSHINGS(a) Using a caliper gauge, measure the inside diameterof the guide bushing.Bushing inside diameter:6.010 – 6.030 mm (0.2366 – 0.2374 in.)(b) Using a micrometer, measure the diameter of thevalve stem.Valve stem diameter:Intake 5.970 – 5.985 mm(0.2350 – 0.2356 in.)Exhaust 5.965 – 5.980 mm(0.2348 – 0.2354 in.)(c) Subtract the valve stem diameter measurement fromthe guide bushing inside diameter measurement.Standard oil clearance:Intake 0.025 – 0.060 mm(0.0010 – 0.0024 in.)Exhaust 0.030 – 0.065 mm(0.0012 – 0.0026 in.)Maximum oil clearance:Intake 0.08 mm (0.0031 in.)Exhaust 0.10 mm (0.0039 in.)If the clearance is greater than maximum, replace thevalve and guide bushing.6. IF NECESSARY, REPLACE VALVE GUIDE BUSHINGS(a) Gradually heat the cylinder head to 80 –100°C (176– 212°F).(b) Using SST and a hammer, tap out the guidebushing.SST 09201–70010
ENGINE MECHANICAL–Cylinder Head (4A–FE)EM–95(c) Using a caliper gauge, measure the bushing borediameter of the cylinder head.Both intake and exhaustBushing bore diameter Bushing sizemm (in.)(d) Select a new guide bushing (STD or O/S 0.05).If the bushing bore diameter of the cylinder head isgreater than 11.027 mm (0.4341 in.), machine the bushingbore to the following dimension:11.050 –11.077 mm (0.4350 – 0.4361 in.)If the bushing bore diameter of the cylinder head isgreater than 11.077 mm (0.4361 in.), replace the cylinderhead.(e) Gradually heat the cylinder head to 80 –100°C (176– 212°F).(f) Using SST and a hammer, tap in a new guide bushinguntil there is 12.7 –13.1 mm (0.500 – 0.516 in.)protruding from the cylinder head.SST 09201–70010(g) Using a sharp 6 mm reamer, ream the guide bushingto obtain the standard specified clearance (Seepage EM–94) between the guide bushing and valvestem.
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ENGINE MECHANICAL–Cylinder Head (<strong>4A–FE</strong>)EM–95(c) Using a caliper gauge, measure the bushing borediameter of the cylinder head.Both intake and exhaustBushing bore diameter Bushing sizemm (in.)(d) Select a new guide bushing (STD or O/S 0.05).If the bushing bore diameter of the cylinder head isgreater than 11.027 mm (0.4341 in.), machine the bushingbore to the following dimension:11.050 –11.077 mm (0.4350 – 0.4361 in.)If the bushing bore diameter of the cylinder head isgreater than 11.077 mm (0.4361 in.), replace the cylinderhead.(e) Gradually heat the cylinder head to 80 –100°C (176– 212°F).(f) Using SST and a hammer, tap in a new guide bushinguntil there is 12.7 –13.1 mm (0.500 – 0.516 in.)protruding from the cylinder head.SST 09201–70010(g) Using a sharp 6 mm reamer, ream the guide bushingto obtain the standard specified clearance (Seepage EM–94) between the guide bushing and valvestem.
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