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ENGINE 24 OVERHAUL 3. Lightly lubricate the tool with engine oil. chamber side of cylinder head until shoulder of 5. Check that collet is fully inserted into valve guide and expand collet against the guide 6. Assemble the 45 ° cutter, MS621 (exhaust valves) and 60 ° cutter, MS627 (inlet valves) to tool LRT-12-501. 7. Position tool LRT-12-501 and appropriate cutter to valve seat insert to be refaced. 8. Using the Allen key, adjust position of cutter so that centre of cutter contacts area of seat insert |