Glossary Of Terms Section I - Introduction N14 Page i-10 Glossary Of Terms AFC: Air Fuel Control; a device in the PT fuel pump that limits the fuel delivery until there is sufficient intake manifold pressure to allow for complete combustion. 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 and 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 compression stroke and ex- haust stroke. Circumferential Direction: In the direction of a circle in respect to the centerline of a round part or a bore. 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. Cummins Sealant: This is a one part Room Temperature Vulcanizing (RTV) silicone rubber, adhe- sive and sealant material having high heat and oil resistance, and low com- pression 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 Dye Penetrant Method: A method used to check for cracks in a part by using a dye penetrant and a developer. Use crack detection kit, Part No. 3375432, or its equivalent. End Clearance: The clearance in an assembly determined by pushing the shaft in an axial di- rection one way and then pushing the shaft the other way. E.S.N.: Engine Serial Number Hammer: A hand tool consisting of a hard steel head on a handle. I.D.: Inside Diameter Loctite 290:
A single component, anaerobic, polyester resin, liquid sealant compound that hardens between closely fitted metal surfaces producing a tough, hard bond with good characteristics. An equivalent product is Perma-Lok HL 126. Loctite 609: A single component anaerobic, liquid adhesive that meets or exceeds the re- quirements of MIL-R-46082A (MR) TYPE 1. Some of the equivalent products are Loctite 601 and Permabond HL 138. Lubriplate 105: A mineral oil base grease with calcium soap (2 percent to 6 percent), and zinc oxide (2 percent to 4 percent) additives.