The B engine family includes the Cummins ISB 5.9L, an inline six-cylinder turbodiesel engine. The 6BT 5.9L engine was superseded by the ISB engine in 1998. Although the engine’s basic dimensions were maintained, it was equipped with modern technologies that increased its power, fuel efficiency, and environmental friendliness.
Cast iron makes up the engine block. Its bore and stroke are the same as those of the 6BT. The ISB features symmetrical-chamber aluminum pistons, camshaft assemblies, and forged steel connecting rods. The block contains the camshaft. The ISB engine has a tappet design with multiple valves. The cast iron cylinder head with 24 valves (but still the OHV valve train) is one of the most obvious variations. Two valves are pushed by each rocker. The Bosch VP44 rotary fuel injection pump and electronically controlled fuel systems (Robert Bosch GmbH) are used in the engine. For the easiest and fastest access to engine parts for maintenance, the Cummins ISB 5.9L features an aluminum intake manifold and a brand-new, one-piece aluminum cover in red or silver.
The Bosch high pressure Common Rail fuel injection system was added to the engine in 2003, marking the next phase in the development of ISB. Compared to earlier Cummins 24-valve engines, the common rail injection system has greatly decreased engine noise while increasing power and torque.
Standard and high-performance Cummins ISB engines were offered for the 2001–2002 model year. Only the NV5600 six-speed manual gearbox was available with the High Output ISB, which had slightly more power (+10 hp) and torque (+61 Nm). It featured a larger flywheel, altered fuel injection timing, a Bosch fuel system tuned for increased fuel pressure and performance, and a higher compression ratio of 17.2:1. The 2003 high-output version outperformed the standard ISB engine by a measurable 70 horsepower and 129 Nm. The High Output models added 20 horsepower and 61 Nm of torque in 2004.
2007 marked the end of the 5.9-liter ISB engine’s existence. The more potent and technologically sophisticated ISB 6.7, the most recent engine in the B series, will be Cummins’ next light truck engine.
Specifications
| Manufacturer | Cummins |
| Production years | 1998-2007 |
| Cylinder block alloy | cast iron |
| Cylinder head material | cast iron |
| Fuel type | diesel |
| Fuel system | 1998-2002 — rotary vane fuel pump Bosch VP44 with electronic control 2003-2009 — Bosch High Pre |
| Configuration | inline |
| Number of cylinders | 6 |
| Valves per cylinder | 4 |
| Valve train layout | OHV |
| Cylinder bore, mm | 102 |
| Piston stroke, mm | 119 |
| Displacement | 5.9 liters |
| Configuration | Four-stroke, turbocharged |
| Compression ratio | 16.3:1; 17.2:1 High Output version |
| Displacement | 215-325 hp at 2500 rpm |
| Torque output | 569-827 Nm at 1400-1600 rpm |
| Weight | 522 kg |
| Firing order | 1-5-3-6-2-4 |
| Oil volume | 11,4 liter (with filter) |
| Oil change interval | 12000 km or 6 months |
| Installed | Dodge Ram pickups, buses, medium trucks, sea vessels |
Frequent problems and reliability ISB 5.9L Cummins
ISB 5.9 is still known for its strong, dependable, and long-lasting diesel engines. offers recoverability and a long service life. Unlike earlier B Series engines, which had a mechanical fuel pump powered by the camshaft gear, ISB camshafts are more dependable because the electric fuel pump is powered by electricity. But the electronic system had an impact. Compared to the older P7100 mechanical injection pump, the VP44 electronic pump had a higher failure rate. The Common Rail injection system is more sensitive to fuel quality and requires expensive repairs.
Modifications
- 1998 – 2000 years of release:
Automatic transmission – 215 HP at 2700 rpm, 570 Nm at 1600 rpm.
Manual transmission – 235 HP at 2700 rpm, 624 Nm at 1600 rpm. - 2001 – 2002 years of release:
The standard version for manual and automatic transmissions is 235 hp. at 2700 rpm, 624 Nm at 1400 rpm.
High Output version with manual transmission – 245 hp at 2700 rpm, 685 Nm at 1600 rpm. - 2003 release:
The standard version for manual and automatic transmissions is 235 hp. at 2700 rpm, 624 Nm at 1400 rpm.
High Output version with manual transmission – 305 hp at 2900 rpm, 752 Nm at 1600 rpm. - 2004 release:
The standard version for manual and automatic transmissions is 305 hp. at 2900 rpm, 752 Nm at 1400 rpm.
High Output version with manual transmission – 325 hp at 2900 rpm, 827 Nm at 1400 rpm.
Cars on offer in California – 235 hp / 2700 rpm, 624 Nm / 1400 rpm (High Output Cummins was not offered in California due to strict emissions regulations in that state). - 2005-2007 years of release:
One version produced 325 hp. at 2900 rpm, 827 Nm at 1600 rpm.