BOLT 1653935 - Caterpillar

New 3406B Engines are available for use in industrial, marine, generator set and truck applications. These engines have several improvements over the former 3406 Engines. Some of these improvements are a new fuel system, automatic timing advance and an improved cylinder block. Truck engines have, in addition to these improvements, a new high-lift camshaft, double valve springs and an improved turbocharger.
The new 3406B Engines use the New Scroll Fuel System. This fuel system includes a new fuel transfer pump, fuel injection pump and fuel injection nozzles and nozzle adapters.
The new fuel transfer pump is a piston type pump that is mounted directly on the fuel injection pump. This new piston-type pump will have a longer service life than the former gear-type transfer pump.
The new fuel injection pump operates at pressures up to 103 500 kPa (15,000 psi). This high injection pressure results in a shorter injection duration. More complete combustion is the result.
The fuel injection nozzles have smaller orifices in the tip. These smaller orifices and increased fuel pressure result in a better spray pattern and more complete combustion.
A new automatic timing advance is used in the 3406B Engines. The new timing advance unit can adjust the rate of advance as well as the amount of the advance. The former unit was not adjustable.
An improved cylinder block is also used in the 3406B Engines. These new blocks have a top deck that is thicker.
New turbochargers are used on the 3406B Truck Engines. These new turbochargers have compressor wheels with improved blades. These blades improve the effeciency of the turobcharger.
New high lift camshafts are also used in the new truck engines. These camshafts give an improved flow of air and exhaust through the engine.
Information about the 3406B Engines is available in: