HEXA

ENGINE 52 E. Valve Seats : 1. Check valve seat height with respect to cylinder head mating surface. Replace valve seat inserts if they are worn out beyond specified limit. 2. Cut exhaust and inlet valve seats with a general 45 deg. cutter. NOTE  Valve seat must be absolutely faultless and without any chatter marks. 3. If necessary lap the valve seats to a smooth and even finish by using suitable hand pump grinder or a lapping paste and valve itself. 4. Smear valve seat with carbon blue. Install valve in guide and turn it slowly under axial pressure. 5. Contact line on valve seat must be around entire circumference at equal width. 6. Distance between narrow diameters of valve face to contact line should be minimum 0.5 mm. 7. Check for leakages through valve seat by pouring gasoline on valve head. Gasoline must not seep past valve seat. Valve seat Specifications Dimensions Intake Valve Exhaust Valve Valve Seat Angle 'H' 45 0 + 15’ 45 0 + 15’ Distance ‘F’ between Cylinder head mating Surface with crank Case to Valve Seat in Cylinder head 7.5 - 0.1 mm 7.5 - 0.1 mm Maximum run out of Valve Seat in Cylinder Head with Respect to Valve guide axis 0.1 mm 0.1 mm Valve Seat Insert Bore Dia. in Cylinder Head (mm) Normal : 30.7 H7 Normal 1 : 30.9 H7 Normal : 26.8 H7 Normal 1 : 27 H7 Valve Seat Insert Outside Bore Dia. in Cylinder Head (mm) Normal : 30.81 H6 Normal 1 : 31.01 H6 Normal : 26.91 H6 Normal 1 : 27.11 H6