Bosch model P7100 inline-style injection pump - The '94-'98 Cummins 5.9L engine has been the mainstay of diesel power in Dodge trucks, and has a reputation as an excellent performer with the ability to make some serious horsepower. One of this engine's features that makes it so desirable is the Bosch P7100 inline mechanical injection pump. This injection pump, often called a "P-pump," is the Holley Four-barrel carburetor of the diesel world. The P7100 pump has been around forever, is practically bulletproof, and is very tunable for high performance. There have been several versions of the 5.9 L ISB featured in the Dodge Ram.
The BT 5.9 was first introduced to Dodge Rams in 1989. The Cummins engine in 1991.5 got an intercooler. In 1994, the engine changed over to a Bosch model P7100 inline-style injection pump from the previous Bosch VE series rotary pump. One unusual feature of the ISB is that it is a multi-valve pushrod engine design. The engine displaces 359 cubic inches (5883 cc) with a 4.02-inch (102.1 mm) bore and 4.72-inch (119.9 mm) stroke. A turbocharger output in the high-compression (17.2:1 in recent versions) Diesel. It is an all-iron engine with forged steel connecting rods, an assembled camshaft, and a cast aluminum intake manifold. The engine is produced in Columbus, Indiana.
There have been several versions of the 5.9 L ISB featured in the Dodge Ram. The BT 5.9 was first introduced to Dodge Rams in 1989. The Cummins engine in 1991.5 got an intercooler. In 1994, the engine changed over to a Bosch model P7100 inline-style injection pump from the previous Bosch VE series rotary pump.
How The P-Pump Works
The P7100 injection pump is flange-mounted to the engine and is driven directly from the engine's crankshaft through a gear train. The internal pump components are housed in a case constructed of cast aluminum, cast iron, or forged steel. The engine crankshaft drives the pump via a timed reduction gearset. The geardriven pump drive plate is connected to the injection pump camshaft (not the engine cam, but internal to the pump) with eccentrics designed to actuate the pump elements. Rotating the pump drive plate rotates the pump camshaft. The camshaft is supported by main bearings and rotates within the injection pump cambox. The cambox is the lower portion that houses the camshaft, tappets, and integral oil sump. In many ways, the P7100 pump has many of the components of an inline internal combustion engine.
