SEAL-O-RING 1291653 - Caterpillar

General Information
LOW EMISSION SYSTEM COMPONENTS
1. Electronic control. 2. Breather. 3. Inlet manifold. 4. Exhaust tube. 5. Switch cover.
LOW EMISSION SYSTEM COMPONENTS
4. Exhaust tube. 6. Pressure oil line. 7. Solenoid (two). 8. Lever. 9. Actuator rod. 10. Actuator. 11. Oil drain line. 12. Exhaust recirculation valve.The Low Emission 3208 Engine is a 3208 Engine with modifications to meet California diesel exhaust emissions standards.The fuel injection pump for the Low Emission Engine has a different load stop pin with a switch and switch cover (5) installed over it. There is a separate electronic control (1) fastened to the fuel injection pump and connected to switch cover (5). Exhaust recirculation valve (12) is installed on the left side exhaust manifold and is operated by actuator (10) and two solenoids (7). Exhaust recirculation tube (4) is installed between exhaust recirculation valve (12) and inlet manifold (3). The Low Emission Engine has a 3° automatic timing advance in place of the standard 5° automatic timing advance unit. Crankcase breather (2) is installed on the valve cover in the place of a positive crankcase ventilation valve.When the Low Emission Engine is at idle or low load, some of the exhaust is sent back to the inlet manifold. As the engine load increases, the amount of exhaust sent back to the inlet manifold decreases. At full load there is no exhaust sent back to the inlet manifold.The switch and switch cover (5), and electronic control (1) operate two solenoids (7) and actuator (10). The actuator uses engine oil pressure that works against pistons in the actuator to control the position of actuator rod (9). The actuator rod is connected to lever (8) on the shaft of exhaust recirculation valve (12). Baffles on the valve shaft control the amount of exhaust gas that is sent back to the inlet manifold to be burned again.The Low Emission System is designed so that if the electronic control does not function properly, there will be NO exhaust sent to the inlet manifold.
DO NOT use a 24 V source to "Jump Start" a Low Emission Engine. The electronic control will be damaged if more than 12 V is connected to the electrical system.
Low Emission Systems
Switch And Switch Cover And Electronic Control
LOW EMISSION SWITCH AND SWITCH COVER
1. Switch cover. 2. Wires (to electronic control). 3. Fuel setting adjustment screw. 4. Switch. 5. Load stop pin. X. Contact. Y. Contact. Z. Full load contact.Switch (4) opens or closes electrical circuits which control the operation of the two actuator solenoids. The circuits are completed when load stop pin (5) makes contact with one or both contacts (X or Y). Contacts (X and Y) can be adjusted to a specific distance apart so that contact (X) is closed by the load stop pin before contact (Y) is closed. Contacts (X and Y) must also be adjusted a specific distance from fuel setting screw (3). Contact (Z) is for the use of a circuit tester when the fuel setting is adjusted.Only a very small amount