GEAR RING 3P2894 - Caterpillar

Components Of The 6V9050 Exhaust Stud Removal Group
1. 6V3073 Carrying Case2. 6V4094 Liner3. 5P7330 Lock Screw4. 6V7847 Fixture5. 6V9051 Block6. 6V9046 Bushing [for 7.938 mmØ (.312"Ø) drill]7. 6V9047 Bushing [for 3.175 mmØ (.125"Ø) drill]8. 6V9045 Bushing [for 9.5 mmØ (.375"Ø) bolt]9. 0S1571 Bolt10. 6V9049 Drill [3.175 mmØ (.125"Ø)]11. 6V9048 Drill [7.938 mmØ (.312"Ø)]12. 5P6732 ScrewInstallation And Use Of 6V9050 Exhaust Stud Removal Group
1 If broken stud (1) is more than 3.2 mm (.125") above the gasket surface, grind the end of stud (1) flat so it is less than this dimension. Be careful not to grind the surface of the cylinder head.2 Fasten 6V7847 Fixture (2) to the cylinder head using two 6V9045 Bushings (3) and two 0S1571 Bolts (4). 3 Put 6V9047 Bushing (5) in fixture (2). Use a 9.5 mm (.375") capacity drill and 6V9049 Drill (6) to drill through the broken stud.
Do not drill into the cylinder head. While drilling, periodically pull out the drill to remove chips and lubricate drill (6).
4 Remove bushing (5) and chips from the hole. Put 6V9046 Bushing (7) in fixture (2). Use 12.7 mm (.50") capacity drill and 6V9048 Drill (8) to drill out the remainder of the broken stud.
Do not drill into the cylinder head. While drilling periodically pull out the drill to remove chip and lubricate drill (8).
5 Remove the fixture from the cylinder head. Remove the tip of the stud from the cylinder head using 5P6732 Screw (9).6 Use a 3/8-16 tap (10) to remove any remaining stud threads from the hole. Do not make threads past the depth of the original threads. Clean the threaded hole. Inspect the threads for damage. If damaged, helicoils may be installed in the heads of 1100, 3100 and 3200 Series engines; on 3300 and 3400 Series engines, the cylinder head should be replaced with a new or exchange cylinder head.