Cummins ISB Quick Sheet
Although the Cummins ISB is recognized mostly as the powerplant for the Dodge Cummins diesel, the engine is also used in many motorhome and industrial applications. Known sometimes as the " 5.9 Cummins ", The Cummins ISB was first introduced in late 1998. Originally the engine was equipped with a Bosch VP44 rotary injection pump, but was changed for 2003 to a high pressure common rail (HPCR) fuel system. Although a reliable engine, the VP44 injection pump was known to cause problems. The pump is very sensitive to lack of fuel lift pump pressure, and quite costly to repair. If your lift pump pressure dropped too low (or quit all together), it was not long before your injection pump would start logging faults. There was no way to know if the lift pump had failed without a manual pressure gauge. Later, lift pump kits became available to add a "dummy" light to the system which would illuminate if the pressure dropped below 3.5 psi. The ISB engine is still used in many areas, although the 5.9 Cummins can now be replaced by the 6.7 Cummins. Use the charts below for useful information for the ISB engine: Engine Ratings | Advertised hp @ rpm | Peak Torquelb-ft @ rpm | GovernedSpeed | | 235 - 325 @ 2900 | 460 - 610 @ 1600 | 2900 |
Maintenance Schedule(Why Fleetguard Filters?)| Oil Filter | 7,500 Miles | | Fuel Filter | 15,000 Miles | | Valve Adjustment | 150,000 Miles |
"Common Rail" Filter Part Numbers (Fleetguard Numbers) | With EGR | Without EGR | | Oil Filter | LF3970 | LF16015 | | Fuel Filter | FS19596 | FF5485 |
"VP44" Filter Part Numbers (Fleetguard Numbers)| Oil Filter | LF3970 | | Fuel Filter | FS1261 (Spin On)or FS19519 (Cartridge) |
Useful Specs "Common Rail"| Intake Valve Clearance | .010" | | Exhaust Valve Clearance | .020" | | Firing Order | 1-5-3-6-2-4 | | Oil Pressure | 10psi (Idle), 30psi (Rated RPM) |
Useful Specs "VP44"| Intake Valve Clearance | .010" | | Exhaust Valve Clearance | .020" | | Firing Order | 1-5-3-6-2-4 | | Oil Pressure | 15psi (Idle), 45psi (Rated RPM) | | Lift Pump Pressure | 8-17 psi (before filter) |
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