The M50129 Counterbore Shim Cutter Plate is a precision-engineered machining fixture designed specifically for servicing Mack E7 engine blocks. Functioning as a direct alternative to OEM tool PT-2210-3A, this cutter plate provides the stable, accurate alignment required for counterbore machining and shim installation during top-deck and liner seat restoration.
When an E7 block experiences liner seat wear, distortion, or erosion, correct counterbore machining is essential to restore factory liner protrusion specifications. The M50129 plate securely positions the cutter assembly, ensuring controlled, concentric metal removal and a perfectly uniform counterbore surface. This helps prevent head gasket sealing issues, liner movement, combustion leakage, and premature rebuild failure.
Built from high-grade materials and manufactured for durability, the M50129 is ideal for professional engine rebuilders, remanufacturing facilities, and heavy-duty fleet maintenance operations working extensively with Mack E-series engines. It delivers repeatable accuracy on every job, ensuring the block is properly prepared for shimming and liner installation.
Key Features & Benefits
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Designed specifically for Mack E7 diesel engine counterbore machining.
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Direct replacement for PT-2210-3A cutter plate used in shim cutting operations.
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Provides precise cutter alignment for restoring counterbore depth and liner seat geometry.
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Supports accurate liner protrusion setup, improving head-gasket sealing and preventing future failures.
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Heavy-duty construction ensures stability, rigidity, and long service life in high-volume shop environments.
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Ideal for block resurfacing, liner seat repair, and full engine rebuild workflows.
Applications
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Mack E7 diesel engines
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Counterbore machining for shim installation
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Engine rebuild shops, machine shops, fleet service programs, and remanufacturing centers
