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Cummins ISL Quick Sheet
The Cummins ISL engine is mostly known for being the powerhouse of the larger sized motorhomes. Although also used for firetrucks due to the high horsepower ratings, the ISL really shines when it powers the Cummins diesel motorhome. The original ISL engine feautured a fuel pump similiar to the ISC. This pump is known as the Cummins Accumulator Pump System (CAPS). This CAPS pump was a computer controlled injection pump, with individual fuel lines to each injector. In 2003, Cummins released the updated ISL engine. Among other differences, the most significant was the change to the High Pressure Common Rail (HPCR) fuel system. The new fuel system eliminated the CAPS injection pump, relying on electronic controlled injectors to actuate fuel. Use the charts below for useful information for the ISL engine: Engine Ratings | Advertised hp @ rpm | Peak Torquelb-ft @ rpm | GovernedSpeed | | 350 - 400 | 1050 - 1200 @ 1300 | 2200 |
Maintenance Schedule (CAPS Fuel System)(Why Fleetguard Filters?)| Oil Filter | 18,000 Miles, 500 Hours, or 6 Months | | Fuel Filter | 18,000 Miles, 500 Hours, or 6 Months | | Coolant Filter | 18,000 Miles, 500 Hours, or 6 Months | | Valve Adjustment | 150,000 Miles, 5000 Hours, or 4 Years |
Maintenance Schedule (HPCR Fuel System)(Why Fleetguard Filters?)| Oil Filter | 20,000 Miles, 500 Hours, or 6 Months | | Fuel Filter | 20,000 Miles, 500 Hours, or 6 Months | | Coolant Filter | 20,000 Miles, 500 Hours, or 6 Months | | Valve Adjustment | 150,000 Miles, 5000 Hours, or 4 Years |
Filter Part Numbers (Fleetguard Numbers) | HPCR (03 & up) | CAPS (98-03) | | Oil Filter | LF9009 | LF9009 | | Fuel Filter (Water Seperator) | FS1003 | FS1022(without EGR),
FS1003 (with EGR) | | Fuel Filter | FF5488 | N/A |
Useful Specs (CAPS or HPCR Fuel System)| Intake Valve Clearance | .012" | | Exhaust Valve Clearance | .022" | | Engine Brake Clearance | .090" | | Firing Order | 1-5-3-6-2-4 | | Oil Pressure | 10psi (Idle), 30psi (Rated RPM) |
Fuel Pressure Specs (Minimum, CAPS & HPCR) | | Lift Pump | 5 psi cranking | | Gear Pump | 10 psi Cranking
70 psi @ rated speed |
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