M52050 Top Deck Counterbore Sleeving Tool (PT-2050 / PT-2050-D Equivalent)

The M52050 Counterbore Boring Tool is a heavy-duty block deck repair tool engineered for top-deck sleeving applications. It is designed to machine out damaged, cracked, or over-cut counterbores in the upper deck of engine blocks so that repair sleeve inserts (liners) can be installed. Once the old counterbore ledge is removed, a repair bushing is inserted, and the new ledge is finished with a subsequent cutter.

This tool is an USA. made replacement for the Porta-Tool PT-2050-D top deck sleeving tool, offering equal functionality with a removable handle design for safer access in tight engine compartments.

Key Features & Benefits

• Performs heavy deck sleeving and counterbore boring on engine blocks

• Specifically intended to salvage blocks where the original counterbore ledge is cracked, damaged, or machined (shim cut) beyond depth limits

• Removable handle design for easier access in tight working spaces (e.g. engine bays)

• Comes with hold-down fixtures, micrometer block, set standard, driver handle, and adapter (cutter plates / bits sold separately)

• Compatible with complet line of campatable repair bushings and subsequent counterbore finishing tools

• Allows reuse of salvageable engine blocks by renewing the deck surface

Typical Applications

• Rebuilding heavy-duty diesel blocks (Cat, Cummins, Detroit, etc.) with damaged top decks

• Repairing counterbores in engines where the ledge is cracked or worn

• Prepping blocks for installation of repair sleeves when original ledge is compromised

• Use in machine shops, overhaul facilities, and heavy-duty engine rebuilders

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