Counter Bore Cutter (1-1/4" Diameter), Cummins ISX15/QSX15

This 1-¼” Enlarging Counter Bore Cutter is a component of the Casting Repair Tooling Kits for both Cummins ISX15/QSX15 DOHC (Kit # 450-6110-60) and SOHC (Kit # 450-6117-60) engines. It is used with a pilot tool to enlarge the injector hole, preparing the casting for subsequent repair steps involving tapered reamers and taps.

This Enlarging Counter Bore Cutter, with a precise diameter of 1-¼ inches, is a crucial tool within the Casting Repair Tooling Kits designed for Cummins ISX15 and QSX15 series engines, including both DOHC (Double Overhead Camshaft) and SOHC (Single Overhead Camshaft) variants. Specifically, it is included in:

The Casting Repair Tooling Kit for Cummins ISX15 / QSX15 DOHC SERIES (450-6110-60) The Casting Repair Tooling Kit for Cummins ISX15 / QSX15 SOHC SERIES (450-6117-60) Its primary function in the casting repair process for these engines is during the “Enlarging the Injector Hole” step. This cutter is used in conjunction with a pilot tool to ensure accurate and centered machining.

The procedure involves first guiding the appropriate pilot tool into the existing injector hole from the face side of the cylinder head. The 1-¼” Enlarging Counter Bore Cutter (434-6513-20) is then used to precisely cut out the injector area of the casting. This enlargement prepares the injector hole for the next stages of the repair process, which involve the use of a tapered reamer to create a tapered bore, followed by tapping to create threads for repair plugs.