5-101.bk Page 34 Friday, March 17, 2006 11:05 AM INSPECTION Visually inspect valve seat inserts for looseness, cracks or other conditions that may result in improper operation. Replace as necessary. Collet PT6390-4 is not included in basic kit PT6391. VALVE SEAT INSERT REMOVAL Refer to Figure 5-41. Valve seat extractor kit PT6391 and collet PT6390-4 are used to remove inlet and exhaust seat inserts. 2 5 1 3 4 6 7 8 9 200298a Figure 5-41 — Valve Seat Extractor Kit PT6391 Page 5-34 200 BENCH PROCEDURES 1. Grinding wheels 2. T-handle and shaft assembly 3. Collet 4. Allen wrench 5. Lifting bridge 6. Grinder base 7. Grinder 8. Wrenches 9. Dressing stone