ENGINE 84 Fig. 6 0.5 mm Fig. 4 Fig. 5 c. Check valve seat height with respect to cylinder head parting surface. Replace valve seat inserts if they are worn out beyond specified limit. 1 Place cylinder head on suitable wooden support. 2 Measure valve seat diameter. 3 Use 15 deg cutter for cutting exhaust valve seat inserts as shown in Fig. 4. 4 Cut valve seats with a 45 deg cutter both for the intake and exhaust inserts. Fig. 5. NOTE Seat must be absolutely faultless and without any chatter mark. 5 If necessary, lap valve seats to a smooth and even finish by using lapping paste. 6 Smear valve seat with carbon blue, place valve in guide and turn it slowly under axial pressure. The contact line on valve seat must be around the entire circumference at equal width. The distance between narrow diameter of valve seat to contact line should be within specified limit. Fig. 6. 7 Check for leakage past valve and its seat by pouring gasoline on valve head. The gasoline must not seep past the seat. 8 Measure distance between valve head and cylinder head parting surface. Refinish valve seats if required.
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