The ATC-7015 (also referenced as PT-7015) is a heavy-duty piston ring compressor engineered for diesel engines with a 5.12″ (130 mm) bore. It is specifically compatible with Caterpillar C-11, C-12, C-13 engines, Cummins NH / small-bore diesel platforms, and Detroit Diesel 60 Series (12.7 non-EGR) applications. MADE IN USA
This clamshell-style compressor delivers precise, uniform ring compression around the piston before insertion into the cylinder bore. Because it eliminates the need for traditional spring-type compressors, it lowers the risk of ring distortion or breakage during piston installation. With accurate fit and durable construction, the ATC-7015 is ideal for rebuilding and maintenance environments where reliability and consistency matter.
Key Features & Benefits
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Exact fit for 5.12″ bore engines, matching original OEM specifications for CAT C and Cummins NH lines (replacement for PT-7015)
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Compatible with C-11, C-12, C-13, Cummins NH, Detroit 60 Series *(12.7 non-EGR) engines
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Clamshell, shell-style compression ensures even force and safer insertion
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Minimizes ring damage, bending, or scuffing
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Rugged design suited for shop or field use under demanding conditions
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Efficient installation — improves workflow in engine rebuilds
Applications
Use the ATC-7015 during piston reinstallation in overhauls of C-series Caterpillar engines, Cummins NH platforms, or Detroit Diesel 60 engines. It’s especially useful when working in tight engine bays or for mechanics needing a dedicated, high-precision ring compressor matched to a 5.12″ bore.