TM 9-2320-386-10 1-14 Change 1 Section III. PRINCIPLES OF OPERATION This section explains how components of the ESP vehicles work. A functional description of these components and their related parts will be covered in the follow- ing paragraphs. To find the operation of a specific system or component, see the Principles of Operation Index below. 1-19. Engine System Operation 1-14 1-20. Fuel System Operation 1-14.1 1-20.1. Compressed Air System Operation 1-14.1 1-21. Central Tire Inflation System (CTIS) Operation 1-14.1 1-22. Cooling System Operation 1-15 1-23. Electrical System Operation 1-15 1-24. Simplified Test Equipment/Internal Combustion Engines – Reprogrammable (STE/ICE-R) 1-15 1-25. Front Winch Operation 1-15 The Caterpillar 3116 engine has a 403 cu. in. (6.6 L) displacement, with 4.13 in. (105 mm) bore and 5.0 in. (127 mm) stroke. The engine is a four-stroke cycle, in-line 6 cylinder with direct fuel injection. The engine is turbocharged with an air-to-air aftercooler (ATAAC) system, and is rated 170 hp at 2700 RPM. The engine lubricating oil, which is both cooled and filtered, is supplied by a gear- type pump. Bypass valves provide unrestricted flow of lubrication oil to the engine parts when oil viscosity is high, or if either the oil cooler or the oil filter elements should become clogged. 1-19. ENGINE SYSTEM OPERATION PARA. TITLE PAGE NO. NO. 1-18. PRINCIPLES OF OPERATION INDEX 1-17. GENERAL