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3. Heat cylinder head to 110 to 130°C (230 to 266°F). 4. Press fit valve seat until it seats on the bottom. 5. Cut or grind valve seat using suitable tool to the specified 6. After cutting, lap valve seat with abrasive compound. 7. Check valve seating condition. Seat face angle “ α ”: 45°15 ′ - 45°45 ′ Contacting width “W”: Intake 1.06 - 1.34 mm (0.0417 - 0.0528 in) Exhaust 1.20 - 1.68 mm (0.0472 - 0.0661 in) 8. Use a depth gauge to measure the distance “L” between the Valve seat resurface limit: Intake 35.95 - 36.55 mm (1.4154 - 1.4390 in) Exhaust 35.92 - 36.52 mm (1.4142 - 1.4378 in) VALVE DIMENSIONS NCEM0019S12 Check dimensions of each valve. Refer to SDS, EM-182 for dimen- Grinding allowance for valve stem tip is 0.2 mm (0.008 in) or VALVE SPRING NCEM0019S13 Squareness NCEM0019S1301 1. Measure dimension “S”. Out-of-square “S”: Less than 1.75 mm (0.0689 in) 2. If it exceeds the limit, replace spring. SEM008A Oil SEM892B AEM343 SEM188A T (Margin thickness) SEM288A S (Out-of-square) CYLINDER HEAD QG Inspection (Cont’d) EM-39 |