The M50172 Counterbore Shim Cutting Tool Kit is a comprehensive machining kit designed specifically for heavy-duty rebuilds of the Caterpillar CAT 3500 engine family. This precision repair system enables machinists and engine rebuilders to accurately machine the liner counterbore ledge, ensuring correct liner seating, protrusion, and sealing in CAT 3500 blocks.
Included in the kit are:
-
A dedicated counterbore tool drive body
-
Mounting plates custom-matched to the CAT 3500 block
-
A cutter plate assembly for removing excess or damaged block from liner seat
-
A precision carbide cutter bit for example, PT-2200-93 to create a flat, concentric surface ready for shim installation
-
A rugged metal storage case for shop-ready durability
Using the M50172 kit streamlines the liner repair workflow:
-
Secure the block and mount the tool body.
-
Install the mounting plate and cutter plate.
-
Machine the counterbore ledge to spec.
-
Install liner shims (as required) and liners.
-
Re-check liner protrusion, head gasket fit-up, and deck alignment.
By producing a true, concentric counterbore surface and enabling accurate shim placement, the kit helps prevent liner misalignment, head gasket sealing failure, and premature engine wear—common problems when the liner support surface is compromised.
This tool kit is ideal for engine remanufacturers, heavy-duty repair facilities, fleet maintenance centers, and block machining shops that service CAT 3500 series engines and need to restore blocks to OEM geometric standards.
Key Features & Benefits
-
Purpose-built for CAT 3500 series engine block counterbore repair.
-
All-inclusive kit: tool drive body + mounting plates + cutter plate + bit = ready-to-go for block machining.
-
Provides precise and repeatable machining of the liner ledge, enabling proper shim and liner installation.
-
Helps avoid costly re-machining, block scrap, seat-failures or head gasket issues.
-
Packaged in a heavy-duty metal carry case to protect tooling and simplify shop organization.
-
Provides professional-grade solution for heavy-duty engine rebuilds and reman operations.
THIS IS A HEAVY ITEM AND NOT ELIGIBLE FOR FREE FREIGHT.
The M50172 Counterbore Shim Cutting Tool Kit is a comprehensive machining kit designed specifically for heavy-duty rebuilds of the Caterpillar CAT 3500 engine family. This precision repair system enables machinists and engine rebuilders to accurately machine the liner counterbore ledge, ensuring correct liner seating, protrusion, and sealing in CAT 3500 blocks.
Included in the kit are:
-
A dedicated counterbore tool drive body
-
Mounting plates custom-matched to the CAT 3500 block
-
A cutter plate assembly for removing excess or damaged block from liner seat
-
A precision carbide cutter bit for example, PT-2200-93 to create a flat, concentric surface ready for shim installation
-
A rugged metal storage case for shop-ready durability
Using the M50172 kit streamlines the liner repair workflow:
-
Secure the block and mount the tool body.
-
Install the mounting plate and cutter plate.
-
Machine the counterbore ledge to spec.
-
Install liner shims (as required) and liners.
-
Re-check liner protrusion, head gasket fit-up, and deck alignment.
By producing a true, concentric counterbore surface and enabling accurate shim placement, the kit helps prevent liner misalignment, head gasket sealing failure, and premature engine wear—common problems when the liner support surface is compromised.
This tool kit is ideal for engine remanufacturers, heavy-duty repair facilities, fleet maintenance centers, and block machining shops that service CAT 3500 series engines and need to restore blocks to OEM geometric standards.
Key Features & Benefits
-
Purpose-built for CAT 3500 series engine block counterbore repair.
-
All-inclusive kit: tool drive body + mounting plates + cutter plate + bit = ready-to-go for block machining.
-
Provides precise and repeatable machining of the liner ledge, enabling proper shim and liner installation.
-
Helps avoid costly re-machining, block scrap, seat-failures or head gasket issues.
-
Packaged in a heavy-duty metal carry case to protect tooling and simplify shop organization.
-
Provides professional-grade solution for heavy-duty engine rebuilds and reman operations.