ATC30144 Counterbore Shim Cutter Plate for Detroit Diesel 60 Series J-41065 Conversion Kit

ATC30144 Counterbore Shim Cutter Plate – Detroit Diesel Series 60 – J-41065 Conversion Kit

Professional Product Description

The ATC30144 Counterbore Shim Cutter Plate is an engine-specific cutter plate designed for machining the cylinder liner counterbore shim ledge on Detroit Diesel Series 60 engines. It is a direct replacement for the Detroit Diesel J-41065 Counterbore Cutter Plate Assembly / Conversion Kit and converts the PT-2250 / M50133 Upper Deck Counterbore Tool for Series 60 counterbore shim-cutting operations.

Detroit's Series 60 service procedure specifically identifies the J-41065 cutter plate assembly used with the PT-2250-B counterbore tool to machine cylinder block counterbores for installation of repair shims. This is an important distinction: the ATC30144 is intended for shim-style counterbore repair, where the existing liner seating surface is accurately recut so a correctly sized repair shim can restore cylinder liner protrusion.

The ATC30144 mounts to the M50133 / PT-2250 style counterbore machine and positions the cutting bit at the correct diameter for the Series 60 liner counterbore. The plate provides the rigid, concentric cutting platform needed to remove only the necessary material from the damaged or fretted counterbore ledge.

The kit includes one PT-2200-93-S cutter bit, so the plate arrives equipped for machining rather than requiring the cutting insert to be purchased separately. Monaco and other professional specialty-tool suppliers confirm this same 30144/J-41065 configuration and cutter-bit specification.

Correct counterbore machining is critical on the Series 60 because the finished ledge establishes the seating surface for the liner and repair shim. An uneven, fretted, or improperly machined counterbore can produce incorrect liner protrusion, contributing to poor cylinder-head sealing, liner movement, and repeat head-gasket problems.

Important Compatibility Note: The ATC30144 is designed for the M50133 / PT-2250 / PT-2250-B style upper-deck counterbore machine. It does NOT work with the PT-2050-D sleeving machine. The PT-2050-D uses different tooling for machining the block for top-deck repair inserts/bushings.

Key Features & Benefits

• Designed specifically for Detroit Diesel Series 60
• Direct replacement / alternative for J-41065
• Converts the M50133 / PT-2250-B counterbore tool for Series 60 applications
• Used to machine counterbores for repair shim installation
• Includes (1) PT-2200-93-S cutter bit
• Provides accurate, concentric machining of the liner shim ledge
• Helps restore proper cylinder liner protrusion
• Allows repair of fretted or damaged counterbores without immediately moving to a block-insert repair
• Replaceable cutter-bit design for long-term professional shop use

Verified Engine Coverage

Designed for the Detroit Diesel Series 60 engine family, including common:

• 11.1L Series 60
• 12.7L Series 60
• 14.0L Series 60

The key application requirement is the Series 60 counterbore configuration and applicable Detroit service procedure, rather than vehicle model alone.

Tool Compatibility

Works With:

• M50133 Upper Deck Counterbore Tool
• PT-2250
• PT-2250-B

Includes:

• ATC30144 Series 60 cutter plate
• (1) PT-2200-93-S Cutter Bit

Does NOT Work With:

• PT-2050-D Top Deck Sleeving Machine

This compatibility difference is important because Detroit uses separate procedures and tooling for shim repairs versus top-deck insert/bushing repairs.

Typical Applications

• Series 60 cylinder counterbore machining
• Counterbore shim ledge resurfacing
• Repair shim installation preparation
• Correcting counterbore fretting and wear
• Restoring cylinder liner protrusion
• In-frame engine overhaul
• Complete Series 60 engine rebuilding
• Heavy-duty diesel machine-shop service