QSX (Tier 3)

Overview

QSX (Tier 3)The QSX not only meets Tier 3 and Stage IIIA emissions standards, it is the base platform to reach Tier 4 requirements as well. It uses in-cylinder technology, a simple and cost-effective solution that maintains the proven performance, dependability and durability of the QSX while operating cleanly and efficiently.

The QSX combines an advanced dual overhead cam design with proven heavy-duty components for dependability without compromise, every hour of every workday. Its unique dual overhead cam design allows the engineers at Cummins to optimize combustion efficiency, add to that our patented wastegated turbo with excellent response and powerful torque rise, and you have an engine capable of delivering optimum performance at every rpm.

Available in a range of ratings from 375-665 hp (280-496 kW), the QSX offers an impressive range of standard features. And options like REPTO (Rear Engine Power Take-Off) add functionality.

To maximize your uptime, maintenance requirements have been consolidated and service intervals extended.

To ensure that every QSX is perfectly matched to every piece of equipment, Cummins PowerMatch and Advisor are ready to provide expert assistance with your spec'ing and installation process.

Every QSX engine is covered by Cummins three-step warranty, one of the most comprehensive and simplest plans in the industry.

Specifications

The high-pressure injection system and electronic controls of the QSX ensure clean, powerful and efficient operation every time. Fuel is injected at pressures of up to 30,000 psi for cleaner, more complete combustion. The intelligence of the electronic control system allows you to use a variety of fuel - even kerosene when diesel fuel isn't available.

Add to that our patented wastegated turbo with excellent response and powerful torque rise, and you have an engine capable of delivering optimum performance at every rpm. The wastegated turbo maximizes output without overboost at high speed and improves airflow at lower speeds for improved responsiveness And everything that makes this a great engine for original equipment also makes it a great engine for repowers. Every time.

Specifications.
Engine Type In-Line, 6-Cylinder  
Displacement 915 cu in 15 L*
Advertised Horsepower 375-630 hp 280-470 kW
Peak Torque 1346-1875 lb-ft 1825-2542 N•m
Bore and Stroke 5.39 in x 6.65 in 137 mm x 169 mm
Aspiration Turbocharged and Charge Air Cooled  
Oil System Capacity 48 U.S. qt 45.42 L*
Coolant Capacity 20 U.S. qt 18.9 L*
Length 56.8 in 1443 mm
Width 40.6 in 1032 mm
Height 51.1 in 1298 mm
Weight (dry) 3,200 lb 1,451 kg

* L = Liters/Litres

Engine Finder Specifications

Markets
Certification Level Tier 3 / Stage IIIA
Power 375 - 665 hp / 280 - 496 kW
Torque 1346 - 1875 lb-ft / 1825 - 2542 N•m

Ratings

Engine Model Advertised hp (kW) @ rpm Peak hp (kW) @ rpm Peak Torque lb-ft (N•m) @ rpm
QSX 665* 665 (496) @ 2100 665 (496) @ 1900 1875 (2542) @ 1400
QSX 630* 630 (470) @ 2100 630 (470) @ 2100 1875 (2542) @ 1400
QSX 600 600 (447) @ 2100 610 (455) @ 1900 1875 (2542) @ 1400
QSX 600* 600 (447) @ 1800 600 (447) @ 1800 1875 (2542) @ 1400
QSX 560 560 (418) @ 1800 560 (418) @ 1800 1875 (2542) @ 1400
QSX 560* 560 (418) @ 1800 568 (424) @ 1700 1744 (2365) @ 1400
QSX 535 535 (399) @ 2100 589 (439) @ 1800 1873 (2540) @ 1400
QSX 535  535 (399) @ 2100  572 (427) @ 1800  1806 (2449) @ 1400 
QSX 530  530 (395) @ 1800  530 (395) @ 1800  1744 (2365) @ 1400 
QSX 520 520 (388) @ 2100 555 (414) @ 1800 1744 (2365) @ 1400
QSX 510** 510 (380) @ 1800 510 (380) @ 1800 1744 (2365) @ 1400
QSX 500 500 (373) @ 2100 550 (410) @ 1800 1744 (2365) @ 1400
QSX 500 500 (373) @ 2000 533 (397) @ 1800 1781 (2416) @ 1400
QSX 500**  500 (373) @ 1800  509 (380) @ 1700  1744 (2365) @ 1400 
QSX 485 485 (362) @ 2100 519 (387) @ 1800 1639 (2222) @ 1400
QSX 450 450 (336) @ 2100 480 (358) @ 1800 1550 (2102) @ 1400
QSX 450 450 (336) @ 2000 480 (358) @ 1800 1550 (2102) @ 1400
QSX 450** 450 (336) @ 1800 450 (336) @ 1800 1550 (2102) @ 1400
QSX 435  435 (324) @ 2100  465 (347) @ 1800  1471 (1994) @ 1400 
QSX 410  410 (306) @ 2000  410 (306) @ 2000  1346 (1825) @ 1400 
QSX 400 400 (298) @ 2100 440 (328) @ 1800 1452 (1969) @ 1400
QSX 390 390 (291) @ 2000 390 (291) @ 2000 1346 (1825) @ 1400
QSX 375** 375 (280) @ 1800 375 (280) @ 1800 1346 (1825) @ 1400

All ratings are intermittent unless otherwise noted. Additional ratings may be available. Check with your Cummins distributor or dealer.

*Indicates a restricted rating.
**Indicates a continuous rating.

Features

Cummins QSX has these standard features:

  • Dual Overhead Cams - The first drives the high-pressure fuel system and the second operates the intake and exhaust valves.
  • Patented Wastegated Turbo - Maximizes performance at every rpm.
  • High-Pressure Fuel System - Up to 30,000 psi for cleaner, more complete combustion.
  • Quantum System Electronic Controls - Optimize engine performance. The intelligence of the system even allows you to use a variety of fuel such as kerosene when diesel fuel isn't available.
  • Heavy-Duty Rings, Pistons, Bearings - Built to last in excess of 21,000 hours (35% load factor) with high-strength alloys.
  • Engine Protection System - Early detection system minimizes potential damage and reduces downtime.
  • Fleetguard® ES Oil and Fuel Filters - Allow 500-hour service intervals.

Maintenance

Maintenance Intervals

The Cummins QSX was designed to minimize maintenance requirements and maximize your uptime. That's why oil drain intervals for the Cummins QSX are set for 625 hours or six months. Filters are vertically mounted for easy access and rapid changing, with no messy spills. Advanced Fleetguard® ES oil and fuel filters allow 500-hour service intervals. Polyvee belts have auto-tensioners, so they never need adjusting. Plus, with the QSX you won't need to adjust the overhead for 3,000 hours.

Dipsticks and oil fills are available from both sides of the engine. And there are three drain ports available, so you never have to worry about having access to maintenance points.

For complete maintenance information, please consult your Owner's Manual or Operations and Maintenance Manual.

Brochures Available

Title Bulletin Number Request View  
Encompass Tri-Fold Mailer 3624570 Request View  Download
Every Solution - Tier 3 Engine Brochure 4087035 Request View  Download
QSX Tier 3 for Industrial Applications Spec Sheet 4087066 Request View  Download
QSX Tier 3 for Industrial Applications Spec Sheet - French 4087082 Request View  Download