CYLINDER GP-COUPLER 4522509 - Caterpillar

Introduction
For Specifications with illustrations, make reference to SPECIFICATIONS for 3408 & 3408B INDUSTRIAL AND MARINE ENGINES, Form No. SENR7380. If the Specifications in Form SENR7380 are not the same as in the Systems Operation and the Testing and Adjusting, look at the printing date on the back cover of each book. Use the Specifications given in the book with the latest date.Engine Design
CYLINDER, VALVE AND INJECTION PUMP LOCATIONBore ... 137.2 mm (5.40 in.)Stroke ... 152.4 mm (6.00 in.)Number and Arrangement of Cylinders ... V-8Firing Order (Injection Sequence) ... 1, 8, 4, 3, 6, 5, 7, 2Rotation of Crankshaft (when seen from flywheel end) ... counterclockwiseRotation of Fuel Pump Camshaft (when seen from pump drive end) ... counterclockwise Front end of engine is opposite to flywheel end. Left side and right side of engine are as seen from flywheel end. No. 1 cylinder is the front cylinder on the left side. No. 2 cylinder is the front cylinder of the right side.Fuel System
This engine has a pressure type fuel system. There is one injection pump and one injection valve for each cylinder. The injection pumps are in injection pump housing (4) on the top of the engine. The injection valves are in the precombustion chambers or adapters (for engines with direct injection) under the valve covers.Fuel is pulled from fuel tank (6) through primary fuel filter (8) by fuel transfer pump (9). The transfer pump sends fuel through main fuel filter (11) to the manifold of the fuel injection pump housing.Fuel in the manifold of the injection pump housing is the supply for the injection pumps. Some of the fuel in the manifold is constantly sent through an orifice in the tee or fitting that connects the return line to the manifold. The orifice controls the pressure in the manifold and the amount of fuel that returns to the tank. The constant flow of fuel back to the tank removes air from the system.
FUEL SYSTEM SCHEMATIC
1. Fuel inlet line for the injection pump housing. 2. Damper. 3. Adapter with orifice. 4. Injection pump housing. 5. Fuel return line. 6. Fuel tank. 7. Fuel supply lines. 8. Primary fuel filter. 9. Fuel transfer pump. 10. Fuel priming pump. 11. Main fuel filter.
LOCATION OF FUEL SYSTEM COMPONENTS
1. Fuel inlet line for the injection pump housing. 2. Damper. 3. Adapter with orifice. 4. Injection pump housing. 5. Fuel return line. 7. Fuel supply line. 9. Fuel transfer pump. 12. Nut for a fuel injection line at the injection pump. 13. Fuel manifold across the injection pump housing. 14. Adapter through the valve cover base. 15. Governor.There is a surge damper (2) in the system to reduce shock loads on the fuel filter caused by high pressure from the injection pumps. On later engines, damper (2) is installed on the outlet side of fuel manifold (13). On earlier engines, damper (2) is installed on the inlet side of fuel manifold (13).The injection pumps are in time with the engine. They send fuel to