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Cummins ISX Quick Sheet
The Cummins ISX is the mainstream engine offered by Cummins for over the road applications. It is also used in the largest motorhomes due to the power and torque ratings.
Designed as a replacement for the forever popular N14 Cummins, the ISX is the next generation of emmision compliant, high horsepower engines. The Cummins ISX has had two main design changes since its release:
CM570 - The original ISX engine, this engine was released as the replacement for the N14. Designed from the ground up differently than the N14 Cummins, the most noticable difference was the fuel system and the dual overhead cams. The fuel system on the ISX uses metering and timing valves located in the fuel module to regulate fuel to the injectors by front and rear bank. Cummins also added another camshaft dedicated to engine braking.
CM870 - Basically the same as CM570, but with the addition of an EGR valve. The EGR system was installed in late 2002 to meet EPA emmision requirements. CM871 - Once again, basically the same as the CM870, but this time with the addition of a Diesel Particulate Filter (DPF). The DPF filters the exhaust, then uses high exhaust temperatures to clean the filter.
Use the charts below for useful information for the ISM engine:
Engine Ratings
| Advertised hp @ rpm |
Peak Torque
lb-ft @ rpm |
Governed
Speed |
| 435 - 600 |
1450 - 2050 @ 1200 |
2000 - 2100 |
Maintenance Schedule
|
Through 2002 (Non EGR) |
2002-2006 (With EGR) |
2007 & up (with DPF) |
| Oil Filter |
20,000 Miles, 625 Hours, or 6 Months |
25,000 Miles, 800 Hours, or 6 Months |
25,000 Miles, 800 Hours, or 6 Months |
| Fuel Filter |
20,000 Miles, 625 Hours, or 6 Months |
25,000 Miles, 800 Hours, or 6 Months |
25,000 Miles, 800 Hours, or 6 Months |
| Coolant Filter |
50,000 Miles, 1500 Hours, or 1 Year |
50,000 Miles, 1500 Hours, or 1 Year |
50,000 Miles, 1500 Hours, or 1 Year |
Clean Particulate Filter (DPF)
2007 models & up |
N/A |
N/A |
250,000 Miles, 6000 Hours, 2 Years |
| Valve Adjustment |
500,000 Miles, 10,000 Hours, or 5 Years |
500,000 Miles, 10,000 Hours, or 5 Years |
500,000 Miles, 10,000 Hours, or 5 Years |
Filter Part Numbers (Fleetguard Numbers)(Why Fleetguard Filters?)
|
Through 2002 (Non EGR) |
2002-2006 (With EGR) |
2007 & up (with DPF) |
| Oil Filter |
LF9000 or LF9001* |
LF9000 or LF9001* |
LF9000 or LF9001* |
| Suction Fuel Filter |
FS1007 |
FF2203 |
FF2203 |
| Pressure Fuel Filter |
N/A |
FF2200 |
FF2200 |
| Coolant Filter |
WF2125**
or
WF2126***
or
WF2127 |
WF2125**
or
WF2126*** |
WF2125**
or
WF2126*** |
*The LF9001 is a shorter version of the LF9000 for clearance issues.
**The WF2125 filter is used for 150,000 mile change intervals.
***The WF2126 filter is used for 50,000 mile change intervals.
Useful Specs (All ISX Engines)
| Intake Valve Clearance |
.014" |
| Exhaust Valve Clearance |
.027" |
| Engine Brake Piston Clearance |
.276" |
| Firing Order |
1-5-3-6-2-4 |
| Oil Pressure |
15 psi (Idle), 35-40 psi (Rated RPM) |
Fuel Pressure Specs
|
Through 2002 |
2002 & Up |
| Lift Pump |
10 psi |
10 psi |
| Gear Pump Cranking |
100 psi |
100 psi |
| Gear Pump Idle |
225-274 psi |
230-274 psi |
| Gear Pump 2100 RPM |
255-290 psi |
275-300 psi |
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