ENGINE AR 1W1023 - Caterpillar

Introduction
The 9U7990 Counter Bore Tool Group is used to salvage engine block liner seats which are cracked or damaged. The liner seat is machined out and an insert is installed. The 9U7990 Tool Group contains those items needed for every counterbore operation. Each counterbore operation will also require a cutter plate and a cutter bit. Refer to chart "Cutter Plate, Cutter Bit, and Machining Dimensions for Cylinder Block" for the correct cutter bit, cutter plate, counterbore depth and diameter for each insert. The 9U7988 Riser Plate Group is available for use on 3300 Series Engines eliminating the need to remove adjacent cylinder liners.
9U7990 Counter Bore Tool Group. Consists: 1. 9U7985 Basic Counterbore Tool Group (metal box included but not shown) 4. 9U7986 Base and Micrometer Group (case included but not shown) (part of 9U7985 Basic Counterbore Tool Group)14. 9U7987 Master Gauge (part of 9U7985 Basic Counterbore Tool Group)2. 5P7983 Offset Washer (3 required)3. 0L1328 Bolt, 3/4-16 × 4" (3 required)5. 5P8248 Washer, 3/4" (3 required)6. 8T0207 Bolt, M16 × 2 × 100mm (3 required)7. 5P1656 Tool Remover Hook8. 5P1630 Drive Adapter9. 0S1569 Bolt, 5/8-11 × 4" (3 required)10. 5P8247 Washer, 5/8" (3 required)11. 1U7575 Allen Wrench, 1/8"12. 1U7576 Allen Wrench, 5/32"13. 1U7577 Allen Wrench, 3/16"15. 9U7984 Depth Set Spacer Optional Tool
9U7993 Gauge Assembly, Depth (case included but not shown) Cutter Plate and Cutter Bit (Typical Example) 9U7988 Riser Plate Group (case included but not shown)The 9U7988 Riser Plate Group is available for use on 3300 Series Engines, eliminating the need to remove adjacent cylinder liners.Cutter Plate, Cutter Bit, and Machining Dimensions for Cylinder Block
Preparation for Machining
Care and Maintenance of the Hydraulic-Feed Housing
The oil level should always be checked prior to initial use. If a low oil condition exists, tool chatter will occur. The oil level should also be checked periodically to prevent chatter (once a month is sufficient).Check Oil Level
Lay the feed unit on its side with the oil port 1 in the highest position. Support the feed unit so that it lays in the horizontal position. Remove the oil port plug. The feed unit is full when the oil is filled up into the threads. If the oil level is below the threads, then top off using only 30 weight non-detergent motor oil. Open feed valve and slowly rotate and push the mainshaft of the counterbore tool in and out. Top off the oil level any time the oil level drops below the threads. Continue this procedure until no more bubbles appear and oil level is maintained into the threaded area. Replace oil port plug.Cutter Plate Inspection
Always inspect the cutter plate for nicks, burrs or excessive wear (it should be smooth) before proceeding. Refer to the chart "Cutter Plate, Cutter Bit, and Machining Dimensions for Cylinder Block" for the correct cutter plate. Inspect and adjust the ball spring plunger screw (brass colored) which provides tension to the cutter bit. To adjust this screw to the proper tension, first install a cutter bit into the cutter slot. Tighten