EG–53 ENGINE – ENGINE MECHANICAL EM0963 EM0964 200052 (b) Using a micrometer, measure the diameter of the valve 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 from the guide bushing inside diameter measurement. Standard oil clearance: Intake .025–0.060 mm (0.0010–0.0024 in.) Exhaust .030–0.065 mm (0.0012–0.0026 in.) Maximum oil clearance: Intake .08 mm (0.0031 in.) Exhaust .10 mm (0.0039 in.) If the clearance is greater than maximum, replace the valve and guide bushing. 6. IF NECESSARY, REPLACE VALVE GUIDE BUSHINGS (a) Using SST and a hammer, tap out the guide bushing. SST 09201–10000 (09201–01060). 09608–30022 (09608–05010) P02190 SST P02265 (b) Using a caliper gauge, measure the bushing bore diameter of the cylinder head. 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.) | Use O/S 0.05 Select a new guide bushing (STD or 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.