RUN HARD. DREAM BIG.

S P E C I F I C A T I O N S

Advertised Horsepower 400 bhp (298 kW)

Peak Torque 1650 lb-ft (2237 N·m)

Governed Speed 1800 rpm

Clutch Engagement Torque 1000 lb-ft (1356 N·m)

Number of Cylinders 6

Number of Camshafts 2

Operating Cycles 4

Oil System Capacity 14 U.S. gal (53L)

Net Weight 2640 lb (1197 kg)with Std. Accessories, Dry

P E R F O R M A N C EPerformance at SAE standard J1995 conditions of300 ft (90 m) altitude (29.61 in. Hg [100 kPa] barometric pressure), 77 °F (25 °C) air intake temperature and 0.30 in.Hg (1 kPa) water vapor pressure with No. 2 diesel fuelwill be within 5% of that shown at the time of engineshipment. Actual performance may vary with differentambient conditions.

Curves represent performance of the engine with fuel system, water pump, lubrication oil pump, aircompressor (unloaded), and with 10 in. H2O (250 mm)inlet air restriction and with 2.0 in. Hg (50 mm) exhaustrestriction; not included are alternator, fan, optionalequipment and driven components.

Within the recommended cruise range, gear to cruiseat lower engine speeds for best economy, higher enginespeeds for best performance.

ISX 400 FR-10231

Recommended CruiseRPM at 65 mph

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Cummins Engine Company, Inc.Box 3005 Columbus, IN 47202-3005U.S.A.

Phone: 1-800-DIESELS (1-800-343-7357)Fax: 1-800-232-6393E-mail: powermaster@cummins.comInternet: http://www.cummins.com

Bulletin 4000116 Printed in U.S.A. 6/99©1999 Cummins Engine Company, Inc.

Cummins has always been a pioneer in product improvement.Thus specifications may change without notice. Illustrations mayinclude optional equipment.

4 0 0A P P L I C A T I O N A N D G E A R I N GR E C O M M E N D A T I O N S

The ISX 400 features a power curve that delivers outstandingperformance and operating flexibility. The engine has beendesigned to produce maximum power between 1500-1800 rpmand builds up to 1650 lb-ft of torque in the 1000-1400 rpmrange. This power curve design allows the driver to maximizevehicle performance when operating the engine above 1400rpm. In contrast, the driver can elect to drive for maximum fueleconomy by operating the engine in the 1100-1500 rpm range.This flexibility will result in maximum acceleration and grade-climbing performance when operating at higher engine speeds,and maximum operating efficiency with minimum gearshiftswhen operating between 1100-1500 rpm.

These gearing recommendations are ideal for the ISX 400hauling up to 80,000 lbs. GCW. To take advantage of the per-formance and fuel economy benefits of the ISX 400, gear thevehicle so that at 65 mph, the engine speed falls between1450-1550 rpm.

The chart below lists some of the acceptable transmissionand axle ratio combinations that yield engine speeds in the1450-1550 rpm range at 65 mph.

Consult your truck dealer or Cummins Distributor for specificgearing recommendations for your application.

Engine Cruise RPM with 500 Rev/Mile Tires

Transmission (SPD) 9/10 15 13/18 13/18

Top Gear Ratio .74 .79 .73 .73

Rear Axle Ratio 3.70 3.55 3.70 3.90

MPH 62 1418 1452 1395 1471

65 1486 1522 1463 1542

68 1555 1592 1531 1613

70 1600 1639 1576 1660

Engine Cruise RPM with 516 Rev/Mile Tires

Transmission (SPD) 9/10 15 13/18 13/18

Top Gear Ratio .74 .79 .73 .73

Rear Axle Ratio 3.70 3.55 3.70 3.55

MPH 62 1460 1495 1440 1382

65 1531 1568 1510 1449

68 1601 1640 1580 1516

70 1648 1689 1626 1560

We recognize that lower numeric (faster) axle ratios aresometimes used to obtain higher maximum vehicle speeds andlower engine rpm at cruise. When selecting these combinations,one should be aware that: (a) the increase in maximum vehiclespeed will be minimal, (b) the fuel economy benefit associatedwith lower cruise rpms is difficult to measure, (c) and mostimportant, vehicle grade-climbing capability will be adverselyaffected resulting in increased gear shifts. To understand the rel-ative differences between various gearing combinations, oneshould consult an authorized Cummins representative andrequest a vehicle performance simulation (VE/VMS).

T H E F I R S T D I E S E L O F T H E2 1 S T C E N T U R Y — C U M M I N S I S X .The ISX sets a new performance standard for diesels, with anadvanced design that is light years ahead of competitive engines.The ISX is the world's first fully integrated electronic diesel enginewith dual overhead cam design. It is a system designed to lowercost-per-mile for fleet owners and to provide unmatched performance for drivers.

Dual Overhead Camshafts.Cummins unique DOHC design delivers both superior engine performance and exceptional engine braking. The first cam driveshigh-pressure fuel injection for clean,responsive power. Lobes are

extra-wide for longer life and higher-pressure capacity. The second cam includes a dedicated set of lobes for the operationof the integrated engine brake, in addition to operating theintake and exhaust valves.

Cummins Intebrake.Standard on ISX, the Intebrakeworks with cruise control “on,” andhas significantly less weight andcomplexity than add-on enginebrakes.

Fully IntegratedElectronic Controls.The electronic controls on the ISX areintegrated into the engine design, starting from their mounting position onthe cylinder head to the unique air-cooled ECM.

This ECM coordinates all functions from the transmissionand ABS to the engine brake, cooling fan, optional air compressor and more.

Improved Reliability With 30% Fewer Parts.Integrated design eliminates hoses, fittings and vibration problems. Premium edge-molded metal gaskets are engi-neered to meet the design goal of a totally leak-free engine.The result is increased reliability with less to go wrong.

Reduced Maintenance.Advanced Fleetguard® ES System™ with StrataPore™ filters. Upto 50,000 miles (80,500 km) between service intervals in light-duty applications, 40,000 miles (64,400 km) in normal use and20,000 miles (32,200 km) in severe service. Optional CENTINEL Advanced Engine Oil Management System extendsoil change intervals to 525,000 miles (844,900 km).

ICON™ Idle Control System.Optional system minimizes fuel consumed at idle by automati-cally starting and stopping the engine. Eliminates lengthywarm-up times and maintains battery charge. Available CabComfort option keeps a desirable in-cab environment.

Information Technology.Industry standard datalinks let you connect with everythingfrom in-cab systems like RoadRelay™ to cellular and satellitesystems, giving you real-time access to information plus datafor effective management with software programs likeCummins INFORM™ and INSPEC.