V-BELT SET 3R9090 - Caterpillar

Introduction
For Specifications with illustrations, make reference to Specification For 3406C Industrial & Marine Engines, SENR6523. If the Specifications in SENR6523 are not the same as the Systems Operation, Testing & Adjusting, look at the printing date on the front cover of each book. Use the Specifications given in the book with the latest date.Engine Design
Cylinder and Valve LocationBore ... 137 mm (5.4 in)Stroke ... 165 mm (6.5 in)Displacement ... 14.6 liter (893 cu in)Number and Arrangement of Cylinders ... 6, InlineFiring Order (Injection Sequence) ... 1-5-3-6-2-4Valve lash setting with engine cold and stopped: Inlet ... 0.38 mm (.015 in)Exhaust ... 0.76 mm (.030 in)Rotation of Crankshaft (when viewed from flywheel end) ... CounterclockwiseRotation of Fuel Pump Camshaft (when viewed from pump drive end) ... Counterclockwise Front end of engine is opposite to flywheel end. Left side and right side of engine are as viewed from flywheel end. No. 1 cylinder is the front cylinder.Fuel System
Fuel Flow
Fuel System Schematic
(1) Fuel injection nozzle. (2) Fuel injection lines. (3) Fuel return line. (4) Constant bleed orifice (part of the elbow). (5) Fuel injection pump housing. (6) Fuel priming pump. (7) Check valves. (8) Fuel transfer pump. (9) Fuel tank. (10) Primary fuel filter. (11) Secondary fuel filter.Fuel is pulled from fuel tank (9) through primary fuel filter (10) by fuel transfer pump (8). From the fuel transfer pump the fuel is pushed through secondary fuel filter (11) and to the fuel manifold in fuel injection pump housing (5). Fuel pressure in the fuel manifold is determined by the fuel transfer pump spring. A constant bleed orifice is in the fuel return line elbow. Constant bleed orifice (4) lets a constant flow of fuel go through fuel return line (3) back to fuel tank (9). This helps keep the fuel cool and free of air. The individual fuel injection pumps get fuel from the fuel manifold and push fuel at a very high pressure through fuel lines (2) to fuel injection nozzles (1). Each fuel injection nozzle has very small holes in the tip that change the flow of fuel to a very fine spray that gives good fuel combustion in the cylinder.Fuel Injection Pump
The fuel injection pump increases the pressure of the fuel and sends an exact amount of fuel to the fuel injection nozzle. There is one fuel injection pump for each cylinder in the engine.
Fuel Injection Pump
(1) Spill port. (2) Check valve. (3) Pump barrel. (4) Bypass port. (5) Pump plunger. (6) Spring. (7) Fuel rack. (8) Gear. (9) Lifter. (10) Cam.The fuel injection pump is moved by cam (10) of the fuel pump camshaft. When the camshaft turns, the cam raises lifter (9) and pump plunger (5). The pump plunger always makes a full stroke. As the camshaft turns farther, spring (6) returns the pump plunger and lifter to the bottom of the stroke.
Pump Barrel And Plunger Assembly
(1) Spill port. (2) Check valve. (3) Pump barrel. (4) Bypass port. (5) Pump plunger. (11) Orificed reverse flow check valve.