The M10226 Counterbore Cutter Plate Assembly is a precision-machined service fixture designed for Caterpillar 3406 and 3408 diesel engine blocks. Engineered as a direct functional equivalent to OEM part numbers PT-2000-207 and 9U-7991, this cutter plate assembly is used during counterbore restoration to accurately machine the block for installing repair inserts. Works on the Porta-Tool PT2050-D/M52050 and Legacy Porta-Tool Top Deck sleevers PT2000 series
On CAT 3406/3408 platforms, liner seat wear, fretting, or distortion can compromise head gasket sealing and combustion integrity. The M10226 provides rigid, concentric guidance for the cutter, enabling controlled material removal and a flat, true counterbore surface after insert is installed. This precision helps restore OEM liner seating geometry, reducing the risk of liner movement, coolant leakage, and premature head gasket failure.
Manufactured for professional engine rebuilders, machine shops, and fleet maintenance facilities, the M10226 delivers repeatable accuracy and durability for high-volume rebuild environments where consistency and reliability are critical.
Key Features & Benefits
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Designed specifically for Caterpillar 3406 and 3408 engine blocks.
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Direct replacement for PT-2000-207 and CAT 9U-7991 counterbore cutter plate assemblies.
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Provides stable, concentric cutter alignment for precise counterbore machining.
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Helps prevent head gasket leaks, liner fretting, and uneven deck loading.
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Heavy-duty, shop-grade construction for long service life and repeatable results.
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Ideal for engine rebuild shops, remanufacturers, and professional diesel technicians.
Applications
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Caterpillar 3406 and 3408 diesel engines
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Counterbore machining for block deck instert installation
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Engine block refurbishment and overhaul operations
Please check your tool. If your plate screws on this is the wrong cutter plate please order ATC10225
