ENGINE 60 C. VALVE GUIDES: 1. In case of valve stem sticking in valve guide bore or Excessive clearance between them, remove valve guide From cylinder head using drift (Part No.2868 5890 06 05). 2. Check the condition of valve guide oil seals. 3. Check valve guide bore diameter in cylinder head and if necessary, ream valve guide bore in cylinder head to next over size. 4. Install matching size valve guide in cylinder head using drift (Part No. 2868 5890 06 05) and spacer (Part No. 2653 5890 06 01). 5. Fit Valve guide oil seals D. VALVE SEAT: 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.
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