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CYLINDER HEAD AND VALVES ENGINE OVERHAUL 11B-43 VALVE SEAT Assemble the valve, then measure the valve stem Standard value: <Intake> 48.33 mm Limit: <Intake> 48.83 mm VALVE SEAT RECONDITIONING 1. Before correcting the valve seat, check for clearance between the valve guide and valve and, 2. Using the seat grinder, correct to obtain the specified seat width and angle. 3. After correcting the valve seat, lap the valve and valve seat using lapping compound. Then, check VALVE SEAT REPLACEMENT 1. Cut the valve seat from the inside to thin the wall thickness. Then, remove the valve seat. 2. Rebore the valve seat hole in the cylinder head to a selected oversize valve seat diameter. Intake seat ring hole diameters 0.3 oversize: 35.30 − 35.33 mm 0.6 oversize: 35.60 − 35.63 mm Exhaust seat ring hole diameters 0.3 oversize: 33.30 − 33.33 mm 0.6 oversize: 33.60 − 33.63 mm 3. Before fitting the valve seat, either heat the cylinder head up to approximately 250 °C or cool the valve seat in liquid nitrogen, to prevent the 4. Using a valve seat cutter, correct the valve seat to the specified width and angle. VALVE GUIDE REPLACEMENT 1. Using a press, remove the valve guide toward the cylinder block. AK300596 Valve stem Spring AB Valve stem AK300385AB Intake side Exhaust side 43.5˚ – 44˚ 20˚ 10˚ 65˚ 65˚ 0.9 – 1.3 mm 0.9 – 1.3 mm AK300719AB 0.5 - 1 mm 0.5 - 1 mm Cut AK300720AB Oversize hole diameter Valve seat |