The M50145 Counterbore Tool (shim Cutter) is engineered for heavy-duty block service on Cummins ISX, ISX15, and QSX15 engines (Signature 600 as well). It’s specifically designed to machine or correct the 150 mm and 152 mm counterbore surfaces in the engine block, ensuring precise seating and alignment of liner, sleeve, or insert components.
Included in this set is the Setting Master Tool #50146 and the Cutter Plate #20184, as well as the carbide PT-2210-12 cutter bit (spare bits available). This tool does not work on the ISX-12 platform — for that, see part M50159.
Designed for professional engine rebuilders and diesel overhaul facilities, the M50145 ensures repeatable, accurate counterbore machining to OEM standards, reducing runout and maintaining block integrity.
Key Features & Benefits
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Tailored for Cummins ISX / Signature 600 / ISX15 / QSX15 engine blocks
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Cuts both 150 mm and 152 mm counterbore diameters without multiple tooling changes
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Includes a precision Setting Master plus cutter plate and carbide bit
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Facilitates accurate, concentric bore surfaces for liners, sleeves, or inserts
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Built for shop durability and heavy-use environments
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Enables tighter tolerances, lower rejection rates, and improved long-term engine performance
