VALVE SEAT INSPECTION

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1. Before correcting the valve seat, check for clearance between the valve guide and valve and, if necessary, replace the valve guide. 2. Using the seat grinder, correct to obtain the specified seat width and angle. 3. After correction, valve and valve seat should be lapped with a lapping compound.

4. Install the valve and, while pressing the valve against the valve seat, measure the valve stem projection between the valve stem end and the valve spring seat seating surface. Standard value: Intake: 40.95 mm Exhaust: 40.95 mm Limit: Intake: 41.45 mm Exhaust: 41.45 mm

1. Cut the valve seat to be replaced from the inside to thin the wall thickness. Then, remove the valve seat.

2. Rebore the valve seat hole in cylinder head to the oversize valve seat diameter. Intake valve seat hole diameter: 0.30 O.S.: 35.300 - 35.325 mm 0.60 O.S.: 35.600 - 35.625 mm Exhaust valve seat hole diameter: 0.30 O.S.: 33.300 - 33.325 mm 0.60 O.S.: 33.600 - 33.625 mm 3. Before fitting the valve seat, either heat the cylinder head up to approximately 250°C or cool the valve seat using cooling spray to prevent the cylinder head bore from galling. 4. Using valve seat cutter, correct the valve seat to the specified width and angle. See "VALVE SEAT RECONDITIONING PROCEDURE."