The ATC-7040 (also referenced as PT-7040) is a heavy-duty piston ring compressor engineered to safely compress piston rings for installation in engine blocks with 5.400″ (5.4 in) bore diameters. Used commonly on Caterpillar 3400 / 3406 / C-15 and Cummins ISX / QSX engines, this compressor helps prevent ring damage or scuffing during insertion.
The clamshell design ensures a secure, uniform grip around the piston and rings during installation.
Key Features & Benefits
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Precise compression diameter: 5.4″ bore applications
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Compatible with CAT 3400 / C-15 and Cummins ISX / QSX engine blocks
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Replaces PT-7040, ensuring interchangeability with many existing toolkits
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Helps reduce ring breakage or distortion during piston insertion
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Durable construction suited for engine rebuild environments
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Simplifies piston installation and improves consistency
Made In USA
