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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