52 4 DLT ENGINE VALVE SEATS OF VALVES Check valve seat height with respect to cylinder head mating surface. Replace valve seat inserts if they are worn out beyond specified limit. Cut exhaust and inlet valve seats with a 450 cutter. Refer Figures 87 & 88 VALVE SEAT MUST BE ABSOLUTELY FAULTLESS AND WITHOUT ANY CHATTER MARKS. If necessary, lap valve seats to a smooth and even finish by using suitable hand pump grinder or a lapping paste and valve itself. Smear valve seat with carbon blue. Install valve in guide and turn it slowly under axial pressure. CONTACT LINE ON VALVE SEAT MUST BE AROUND ENTIRE CIRCUMFERENCE AT EQUAL WIDTH. Distance between narrow diameter of valve face to contact line should be minimum 0.5 mm. - Refer Figure 89 Check for leakages through valve seat by pouring kerosene on valve head.Kerosene must not seep past valve seat. Fig. 87 Fig. 88 Fig. 89
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