HT400 Pumper Caterpillar

Engine Information

The 3406C Industrial Engine is designed primarily for agricultural, petroleum and auxiliary applications.

A mechanical governor controls the fuel injection pump output. The output maintains the desired engine speed. An automatic timing advance provides the best fuel injection timing over the full range of engine speeds.

The fuel ratio control is located on the governor. The fuel ratio control restricts the fuel rack movement. Only the proper amount of fuel is allowed to be injected into the cylinders during acceleration. This minimizes exhaust smoke.

Inlet air is filtered by an air cleaner. The air is compressed by a turbocharger before the air enters the engine cylinders. The turbocharger is driven by engine exhaust. The engines can be turbocharged. The engines can also be turbocharged with jacket water aftercooling.

The engine is a four cycle engine. Each cylinder head has two inlet valves and two exhaust valves. The rocker arms and the valves are actuated by the camshaft. The action is performed by mechanical lifters and push rods.

Engine Cooling and Lubrication

The cooling system consists of the following components:

• Centrifugal pump that is driven by gears

• Thermostats which regulate the engine coolant temperature

• Oil cooler

• A radiator or expansion tank (incorporating a shunt system)

The engine lubricating oil, that is supplied by a gear type pump, is cooled. 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 efficiency, efficiency of emission controls and engine performance depend on adherence to proper operation and maintenance recommendations. Engine performance and efficiency also depend on the following items:

• Use of recommended coolant/antifreeze

• Use of recommended fuels

• Use of recommended lubrication oils

Refer to the recommended Maintenance Interval Schedule found within this publication in order to maintain the following emission related components:

• Air cleaner

• Engine oil

• Oil filter

• Fuel

• Fuel filter

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 front cylinder.

Illustration 1	g00284836
Cylinder and valve locations (A) Inlet valves (B) Exhaust valves