3412E Petroleum Engine Caterpillar

• Four cycle

• Direct fuel injection

• Hydraulically actuated electronic unit injection

• Turbocharged

• Jacket water aftercooling on the 3412E

Electronic Engine Features

The Caterpillar 3412E Petroleum Engines is designed with electronic controls. The integral on board computer controls the operation of the engine. Current operating conditions are monitored. The Electronic Control Module (ECM) controls the response of the engine to these conditions and to the demands of the operator. These conditions and operator demands determine the precise control of fuel injection by the ECM. The electronic engine control system provides the following features:

• Engine and auxiliary monitoring

• Engine speed governing

• Cold start strategy

• Automatic air/fuel ratio control

• Integrated ether start

• Torque rise shaping

• Automatic altitude compensation

• Injection timing control

• System diagnostics

For more information on electronic engine features, refer to the Operation and Maintenance Manual, "Features and Controls" topic (Operation Section).

Engine Cooling and Lubrication

The cooling system consists of the following components:

• Gear-driven centrifugal water pump

• Water temperature regulators which regulate the engine coolant temperature

• Gear-driven oil pump (gear type)

• Oil cooler

The engine lubricating oil is also filtered. Bypass valves provide unrestricted flow of lubrication oil to the engine components during the following conditions:

• High oil viscosity

• Plugged oil cooler or plugged oil filter elements (paper cartridge)

Engine Service Life

Engine efficiency and maximum utilization of engine performance depend on the adherence to proper operation and maintenance recommendations. In addition, use recommended fuels, coolants and lubricants. Use this Operation and Maintenance Manual as a guide for required engine maintenance.

Expected engine life is generally predicted by the average power that is demanded. The average power that is demanded is based on fuel consumption of the engine over a period of time. For more information, refer to the Operation and Maintenance Manual, "Overhaul Considerations" topic (Maintenance Section).

Engine Specifications

Note: The front end of the engine is opposite the flywheel end of the engine. The left and the right sides of the engine are determined from the flywheel end. The number 1 cylinder is the most forward cylinder.

3412E Industrial Engines

Illustration 1	g00291566
Cylinder and valve locations (A) Inlet valves (B) Exhaust valves