The M50152 Counterbore Setting Master is a precision measurement and setup tool designed specifically for Mack Trucks E7 diesel engines. This setting master is used during counterbore machining and repair operations to accurately establish and verify the correct counterbore depth prior to cutting or finishing operations, ensuring proper cylinder liner protrusion and reliable head gasket sealing.
On Mack E7 engines, correct counterbore depth is critical. Worn or improperly machined counterbores can lead to low liner height, coolant leakage, combustion gas blow-by, and repeated head gasket failures. The M50152 provides a precise reference surface that allows technicians to set counterbore cutting tools accurately, eliminating guesswork and ensuring consistent, OEM-level results.
Designed for professional diesel engine rebuilders, machine shops, and fleet maintenance facilities, the M50152 is an essential companion tool when performing in-frame repairs, full engine rebuilds, or block reconditioning on Mack E7 platforms.
Key Features & Benefits
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Engine-Specific Design: Precision-machined for Mack E7 counterbore specifications.
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Accurate Depth Reference: Establishes correct counterbore depth before machining operations.
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Supports Proper Liner Protrusion: Helps ensure liner height meets factory requirements.
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Prevents Repeat Failures: Reduces the risk of head gasket leaks caused by incorrect counterbore depth.
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Professional-Grade Construction: Built for repeated use in demanding diesel engine machine shop environments.
Typical Applications
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Counterbore machining and repair on Mack E7 engine blocks.
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Setup and calibration of counterbore cutting tools and shim cutter plates.
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Engine rebuild shops, diesel machine shops, and professional fleet service facilities.
Why It Matters
Counterbore depth directly determines liner protrusion, which is one of the most critical dimensions in a diesel engine rebuild. Even small errors can compromise head gasket sealing and engine reliability. The M50152 Mack E7 Counterbore Setting Master ensures cutting tools are set correctly from the start, supporting long-lasting repairs and OEM-quality rebuild results.
