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 Cylinder head height (standard value for new part): 129.9 - 130.1 mm

1.Check the valve face for correct contact. If incorrect, reface using valve refacer. Valve seat contact should be maintained uniform at the centre of valve face. 2.If the margin is smaller than the service limit, replace the valve. Standard value: Inlet: 1.3 mm Exhaust: 1.5 mm Limit: Inlet: 0.8 mm Exhaust: 1.0 mm

3.Measure the valves total length. If the measurement is less than the limit, replace the valve. Standard value: Inlet: 107.58 mm Exhaust: 107.98 mm Limit: Inlet: 107.08 mm Exhaust: 107.48 mm

1.Measure the free height of spring and if it is smaller than the limit, replace. Standard value: 53.1 mm Limit: 52.1 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: Inlet: 0.020 - 0.047 mm Exhaust: 0.035 - 0.062 mm Limit: Inlet: 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: 1.1 - 1.5 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. 3.After correction, valve and valve seat should be lapped with a lapping compound.

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. Inlet valve seat hole diameter: 0.30 O.S.: 33.300 - 33.325 mm Exhaust valve seat hole diameter: 0.30 O.S.: 29.300 - 29.321 mm 3.When the valve sheet is a press fit, 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. Standard value: 18.3 - 18.9 mm note Press the valve guide from above the cylinder head. note The valve guides for the inlet valves are different in length from those for the exhaust valves (45.2 mm for inlet valves; 48.2 mm for exhaust valves) 4.After installing the valve guide, insert a new valve in it to check for smooth movement.