The M50151 Counterbore Setting Master is a precision alignment and measuring fixture designed specifically for the Cummins ISC and ISL engine series. This tool serves as a calibration master for depth-gauges and liner protrusion measuring instruments, enabling engine rebuilders and machinists to establish a zero reference point before performing liner counterbore machining or shim installations.
By providing a consistent and accurate depth, the M50151 ensures that liner protrusion, deck height and counterbore surfaces are brought within factory specifications—minimizing head gasket failures, liner seating issues and expensive rebuild rework. It is especially critical when a block’s counterbore has been changed through machining, wear, or previous service steps. With its durable construction and engineered fit for ISC/ISL platforms, this tool becomes a foundational piece of any professional heavy-duty rebuild workflow.
Key Features & Benefits
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Specifically engineered for Cummins ISC & ISL engine blocks: designed to establish correct measurement reference for counterbore depth and liner height.
-
Provides a reliable “zero” point for dial gauges, laser measurement tools or depth indicators—ensuring repeatable precision.
-
Helps rebuilders restore OEM-level tolerance when preparing the deck, seat, or counterbore surfaces for liner installation or shimming.
-
Minimizes risk of head gasket seal failure, liner seating problems, or improper protrusion that can cause costly engine damage.
-
Rugged, shop-ready construction designed for heavy-duty machine-shop or fleet-service environments.
-
Ideal for full block overhauls, remanufacturing operations, fleet maintenance centers working on ISL/ISC powerplants.
The M50151 Counterbore Setting Master is a precision alignment and measuring fixture designed specifically for the Cummins ISC and ISL engine series. This tool serves as a calibration master for depth-gauges and liner protrusion measuring instruments, enabling engine rebuilders and machinists to establish a zero reference point before performing liner counterbore machining or shim installations.
By providing a consistent and accurate depth, the M50151 ensures that liner protrusion, deck height and counterbore surfaces are brought within factory specifications—minimizing head gasket failures, liner seating issues and expensive rebuild rework. It is especially critical when a block’s counterbore has been changed through machining, wear, or previous service steps. With its durable construction and engineered fit for ISC/ISL platforms, this tool becomes a foundational piece of any professional heavy-duty rebuild workflow.
Key Features & Benefits
-
Specifically engineered for Cummins ISC & ISL engine blocks: designed to establish correct measurement reference for counterbore depth and liner height.
-
Provides a reliable “zero” point for dial gauges, laser measurement tools or depth indicators—ensuring repeatable precision.
-
Helps rebuilders restore OEM-level tolerance when preparing the deck, seat, or counterbore surfaces for liner installation or shimming.
-
Minimizes risk of head gasket seal failure, liner seating problems, or improper protrusion that can cause costly engine damage.
-
Rugged, shop-ready construction designed for heavy-duty machine-shop or fleet-service environments.
-
Ideal for full block overhauls, remanufacturing operations, fleet maintenance centers working on ISL/ISC powerplants.
