CATERPILLAR PEEC FUEL SYSTEM

(PEEC) System Overview The 3406B PEEC Diesel Truck Engine is an electronically-controlled 3406B. The Electronic Control Module (ECM) for the engine controls fuel rate and timing electronically instead of using the flyweights and linkages of a mechanical governor. The electronics also replace the mechanical fuel-air ratio control, torque control group, and various adjustment screws.

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Fuel Ratio Control

The fuel ratio control mounts on the rear of the governor housing. Its purpose is to limit smoke and improve fuel economy during rapid acceleration. It does this by controlling rack movement in the fuel ON direction until there is enough (boost pressure) to allow complete combustion in the cylinders. With the fuel ratio control […]

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Governor

Governor Operation At the point the rack screw (green) first comes in full contact with the torque spring, the rack is at full load point (rated). As demand horsepower increased, with the rack at rated position, the engine speed decreases as the engine goes into lug (full throttle with rpm less than rated rpm).

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Cooling System

The cooling of an engine depends on the principles of conduction, convection, and radiation of heat energy in order to keep the engine running at the proper operating temperature. The coolant receives the heat that is conducted to it from the metal components of the engine; the engine block, the cylinder head, etc. The coolant […]

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