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Diagnosing slow engine shutdown, excessive engine run-on after key-off, hard starting, or white exhaust smoke on Cummins ISX and Signature (CM570, CM870, CM871 HPI-TP fuel system) commercial heavy-duty diesel engines? Attempting to isolate leaking injector check valves or metering plungers by swapping out all six expensive fuel injectors blindly—or fabricating makeshift test block-off plates without calibrated air-bleed ports—causes thousands of dollars in wasted parts and unbilled shop downtime. On Dual-Overhead-Cam (DOHC) Cummins ISX HPI-TP fuel systems, fuel metering actuators regulate fuel rail delivery to the injectors. When an internal injector check valve or nozzle seat wears out, cylinder compression backpressure leaks backward past the injector into the metering rail, or residual fuel drips into combustion chambers after key-off—causing dangerous engine run-on and white smoke. Engineered for professional commercial diesel mechanics, Cummins dealership service stalls, fleet maintenance depots, and heavy equipment field specialists as a direct high-strength replacement for OEM Cummins tool part number 3164001, the ATC3164001 Cummins ISX Injector Leak Test Kit provides a 2.00-pound precision-machined test adapter plate, brass barb hose fitting, and diesel-resistant flexible tubing—delivering 100% accurate, leak-free cylinder isolation to pinpoint leaking injectors immediately without pulling valve covers or injectors unnecessarily.

The Critical Physics of Compression Backpressure & Manometer / Bubble Isolation

On Cummins ISX and Signature engines equipped with HPI-TP fuel systems, the ATC3164001 test adapter plate mounts directly in place of the fuel metering actuator on the Integrated Fuel System Module (IFSM). Once bolted down with its precision-sealed port, technicians connect the supplied diesel-resistant flexible tubing either to a calibrated water manometer or submerge the open tube end into a clear container of water. As the engine is barred over by hand using the crankshaft barring tool, each piston travels upward on its compression stroke. If an injector check valve is leaking, cylinder compression air escapes backward through the faulty injector, travels into the metering gallery, and exits through the ATC3164001 test fixture—producing an immediate rise on the manometer or visible air bubbles in the water container. By matching the moment of pressure rise or bubbling against the overhead set marks on the vibration damper, technicians pinpoint the exact failing cylinder in minutes.

• Targeted Cummins ISX & Signature Fitment – Built specifically for Cummins ISX and Signature engines (CM570, CM870, CM871 HPI-TP fuel systems) experiencing slow shutdown or run-on.
• Direct Cummins OEM Tool Interchange – Direct high-strength replacement for factory Cummins tool part number **3164001** (ATC3164001 / ATC 3164001 / 3164002 / 3164009 / 3163527).
• Complete Test Fixture Assembly – Includes precision-machined test adapter plate, brass barb hose fitting, and diesel-resistant flexible diagnostic tubing.
• Pinpoints Faulty Injectors Without Teardown – Uses engine barring compression backpressure with a manometer or water cup to isolate the exact leaking cylinder quickly.
• Compact 2.00 lbs Professional Shop Build – Precision-machined alloy test plate and brass fittings built for continuous daily use in commercial diesel diagnostic stalls.

Stop Replacing Good Injectors. Command Total Cummins ISX Diagnostic Precision.

The ATC3164001 Cummins ISX Injector Leak Test Kit 3164001 is an essential capital asset for commercial truck repair centers, Cummins dealership service stalls, fleet maintenance facilities, and mobile diesel technicians. Prevent unnecessary six-pack injector replacements, diagnose slow key-off shutdown issues accurately, and service Cummins ISX engines with complete mechanical authority using Apex tools.

Technical Specifications

Technical Metric	Value / Fitment Reference Guidelines
Target Engine Platforms	Cummins ISX and Signature Heavy-Duty Engines (CM570, CM870, CM871 HPI-TP Fuel Systems)
Primary Diagnostic Function	Isolating internal injector check-valve leaks causing slow shutdown or engine run-on
Specialty Tool Cross Reference	Direct OEM replacement for Cummins 3164001 (ATC3164001 / ATC 3164001)
Kit Component Architecture	Machined Test Adapter Plate (3164002), Brass Barb Fitting (3164009), Diesel-Resistant Tubing (3163527)
Part / Model Reference Number	ATC3164001 (ATC 3164001 / 3164001)
Construction Metallurgy	Precision-machined aluminum alloy plate, solid brass barb fitting, and fuel-resistant flexible tubing
Total Package Shipping Weight	2.00 lbs (Essential specialized Cummins ISX fuel system diagnostic kit)

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