The M50134 (PT2210-A) is a mid-stop counterbore tool engineered for precise machining of the counterbore ledge (shim surface) on heavy-duty diesel engine blocks. It is intended to repair depth or re-dress the mid-stop counterbore ledge when shim adjustments are required to restore proper cylinder liner protrusion.
For use with Cummins C, 8.3, 8.9, ISL, ISC, L10, M11, as well as Mack E7, and Caterpillar C-10, C-12, C-13.
This tool accepts interchangeable cutter plates / bits (see below) specialy designed to OEM engine families.
Note: This tool is not compatible with Cummins ISX / ISX15 counterbores — for those, use tool M50145 instead.
By machining an accurate, concentric counterbore ledge, the M50134 ensures consistent shim seating, proper liner protrusion, and improved sealing in rebuilt or re-machined engine blocks. It is widely used by professional rebuild shops, diesel machinists, and heavy-duty engine service centers.
Key Features & Benefits
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Mid-stop counterbore / shim cutter for cleaning or re-cutting the counterbore ledge
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Supports multiple engine families: Cummins C / 8.3 / 8.9 / ISL / ISC / L10 / M11, Mack E7, CAT C-10 / C-12 / C-13
-
Interchangeable cutter plates / bits
-
Precise alignment and concentricity help restore proper liner protrusion
-
Enables reuse of engine blocks after machining counterbore surfaces
-
Durable build for repeated use in shop / machining environments
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The M50134 (PT2210-A) is a mid-stop counterbore tool engineered for precise machining of the counterbore ledge (shim surface) on heavy-duty diesel engine blocks. It is intended to repair depth or re-dress the mid-stop counterbore ledge when shim adjustments are required to restore proper cylinder liner protrusion.
For use with Cummins C, 8.3, 8.9, ISL, ISC, L10, M11, as well as Mack E7, and Caterpillar C-10, C-12, C-13.
This tool accepts interchangeable cutter plates / bits (see below) specialy designed to OEM engine families.
Note: This tool is not compatible with Cummins ISX / ISX15 counterbores — for those, use tool M50145 instead.
By machining an accurate, concentric counterbore ledge, the M50134 ensures consistent shim seating, proper liner protrusion, and improved sealing in rebuilt or re-machined engine blocks. It is widely used by professional rebuild shops, diesel machinists, and heavy-duty engine service centers.
Key Features & Benefits
-
Mid-stop counterbore / shim cutter for cleaning or re-cutting the counterbore ledge
-
Supports multiple engine families: Cummins C / 8.3 / 8.9 / ISL / ISC / L10 / M11, Mack E7, CAT C-10 / C-12 / C-13
-
Interchangeable cutter plates / bits
-
Precise alignment and concentricity help restore proper liner protrusion
-
Enables reuse of engine blocks after machining counterbore surfaces
-
Durable build for repeated use in shop / machining environments
