INSPECTION

Check the cylinder head gasket surface for flatness by using a straightedge in the directions of illustration. Standard value: 0.03 mm Limit: 0.2 mm

1.Check the valve face for correct contact. If incorrect, reface using valve refacer. Valve seat contact should be maintained uniform at the center of valve face. 2.If the margin is smaller than the service limit, replace the valve. Standard value: 1.0 mm Limit: 0.5 mm

3.Measure the valves total length. If the measurement is less than the limit, replace the valve. Standard value: Intake: 115.4 mm Exhaust: 115.4 mm Limit: Intake: 114.9 mm Exhaust: 114.9 mm

1.Measure the free height of spring and if it is smaller than the limit, replace. Standard value: 51.3 mm Limit: 50.3 mm 2.Measure the squareness of the spring and, if the limit is exceeded, replace. Standard value: 2° or less Limit: Max. 4°

Measure the clearance between the valve guide and valve stem. If the limit is exceeded, replace the valve guide or valve, or both. Standard value: Intake: 0.025 - 0.058 mm Exhaust: 0.050 - 0.088 mm Limit: Intake: 0.10 mm Exhaust: 0.15 mm

Assemble the valve, then measure the contact width. If the measurement exceeds the specified limit, replace the valve seat. Standard value: 1.8 - 2.2 mm

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. Standard value: 43.25° - 43.75° 3.After correction, valve and valve seat should be lapped with a lapping compound.

4.Assemble the valve, then measure the contact width. Standard value: 1.8 - 2.2 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 engine oil is applied to the valve sheet or the cylinder head not to damage the inside diameter of the cylinder head. 4.Using valve seat cutter, correct the valve seat to the specified width and angle. See "VALVE SEAT RECONDITIONING PROCEDURE."

3.Press-fit the valve guide until it remains protruded above the cylinder head by the amount indicated in the illustration. Protrusion: 17.0 - 17.5 mm note Press the valve guide from above the cylinder head. note The valve guides for the intake valves are different in length from those for the exhaust valves (54 mm for intake valves; 47 mm for exhaust valves) 4.After installing the valve guide, insert a new valve in it to check for smooth movement.