Section i - Introduction Definition Of Terms M11 Page i-11 Definition Of Terms A.C.: Alternating Current ACT Harness: The wiring harness used to connect the actuators to the ECM AFC: Air Fuel Control; a device in the fuel pump that limits the fuel delivery until there is sufficient intake manifold pressure to allow for complete combustion. Alligator Clip: An electrical test clip attached to the end of a wire API: American Petroleum Institute ASA: Air Signal Attenuator ASTM: American Society of Testing and Materials ATDC: After Top Dead Center; refers to the position of the piston or the crankshaft rod journal. The piston is moving downward on the power stroke or intake stroke. BDC:
Bottom Dead Center; refers to the position of the piston or the crankshaft rod journal. The piston is at its lowest position in the cylinder. BTDC: Before Top Dead Center; refers to the position of the piston or the crankshaft rod journal. The piston is moving upward on the power stroke or exhaust stroke. C: Celsius CAC: Charge Air Cooler CARB: California Air Resources Board CELECT™: A fuel control system that electronically controls the fuel injection to improve fuel economy and to reduce the exhaust emissions. The system does this by controlling the torque and horsepower curve, AFC (smoke) function, engine high speed, engine low idle speed and the road speed.
The CELECT™system also can control fan clutch operation, engine brake enabling and turbocharger wastegating. Additional electronic features include cruise control, PTO, gear down protec- tion, progressive shifting, automotive or VS governor and idle shutoff. C.I.D.: Cubic Inch Displacement Circumferential Direction: In the direction of a circle in respect to the centerline of a round part or a bore. Cm: Centimeter Compulink™: A Cummins service tool used for electronic system analysis and to reprogram the system Concentricity: A measurement of the difference between the centers of either two or more parts, or the bores in one part. CPL:
Control Parts List; this listing identifies the specific parts that must be in- stalled on the engine to meet agency certification. cSt: Centistokes Cummins Sealant: This is a one part Room Temperature Vulcanizing (RTV) silicone rubber, ad- hesive and sealant material having high heat and oil resistance, and low compression set. Some of the equivalent products are Marston Lubricants, Hylosil, Dow Corn- ing, Silastic 732, Loctite Superflex, General Electric 1473, and General Elec- tric 1470. D.C.: Direct Current