TIGOR

1.2L REVOTRON ENGINE 63 E. Cylinder Head Valve Seats : Valve Seat Specification (REVOTRON 1.2L) Dimension Intake Valve Exhaust Valve Valve Seat Diameter 29.1 ± 0.05 mm 24.1 ± 0.05 mm Maximum Runout of Valve Seat with Respect to Valve Guide Axis 0.030 mm 0.030 mm Valve Seat Insert Thickness 5.14 -0.1 mm 4.8 -0.1mm Valve Seat Insert I.D. 27.6 ± 0.1 mm 21.7 ± 0.1 mm Valve Seat Bore I.D.(in cylinder head) Normal : 32.39/32.416 Normal : 27.37/27.400 Valve Seat Insert O.D. Normal : 32.42 (+0.105/+0.080) Normal 1 : 32.92 (+0.105/+0.080) Normal : 27.42 (+0.085/+0.064) Normal 1 : 27.92 (+0.085/+0.064) Valve Seat Insert Bore Angle 15 0 from vertical alignment with cylinder head mating surface 1. Check the height of each valve seat insert with respect to the cylinder head mating surface. Replace the valve seat if worn beyond the specified limit. 2. Measure the runout of the valve seat with respect to the valve guide axis. Maximum runout is 0.030 mm. Replace or resurface the valve seat(s) as necessary. Cylinder Head Vale Seat Resurfacing-: NOTE  The valve seat must be free from chatter marks, scratches and other specifications. 1. Lap the valves and valve seats to a smooth and even finish using lapping paste and a hand pump grinder or by inserting the valve into the cylinder head and rotating to achieve the proper finish. 2. Coat the valve seat with carbon blue I Prussian blue dye and insert the appropriate valve into the cylinder head. 3. Rotate the valve under axial pressure several times and remove from the cylinder head. 4. Inspect the area of contact created by the axial rotation of the valve.  The contact pattern should be equal and unbroken around the circumference of the seat.  The distance from the narrow diameter of the valve seat face to the contact line should be 0.5 mm.