Call us
Due to the global COVID-19 supply chain issues please expect longer than normal lead times and increased shipping costs, thank you.

Cummins ISX Engine

Cummins ISX Engines For Sale

Cummins ISX Engine

The Cummins ISX is a 15 litre Inline (straight) 6 diesel engine manufactured by Cummins for applications such as heavy-duty trucks and motor coaches. Initially regarded as the “Signature” series engine, the ‘IS(X)’ was titled with reference to the use of its “Interact System”. The ISX is commonly used in both highway and vocational trucks with a diverse power spectrum ranging from 430hp to 620 hp. The predecessor of the ISX was the N-14 that ceased production due to the emissions changes implemented by the EPA in 2001. The ISX is undoubtedly a remarkable engine due to its ability to produce raw power while maintaining a brilliant fuel economy.

The ISX was also one of the first heavy-duty diesel engines to integrate an Exhaust Gas Recirculation system. This system aims to cool the temperature in the combustion chamber that subsequently reduces NOx particles. This is achieved by taking exhaust gas particles and recirculating them back through the intake chamber.

Engine Applications and Uses

  • AERA Association MemberHeavy-Duty Trucks
  • Motor homes & RV’s
  • Fire and Emergency vehicles
  • Industrial
  • Mining


Included below are some problems and failures we regularly see from customers who wish to replace their engines. Some issues if caught early enough can prevent engine replacement and some if not diagnosed or rectified can lead to everlasting engine damage.

  • ISX Cummins Reman EngineSpun Crankshaft Bearings
  • Cracked Cylinder Head(s)
  • Scored Pistons and Liners
  • Dropped Valves
  • Camshaft Failure
  • Crankshaft Failure
  • Lifter/Roller Failure
  • Connecting Rod Failure
  • Over Fueling
  • Lack of oil or oil pressure
  • Extreme Blow By


When it comes to your engine there is an array of issues you might be faced with. You may have a disastrous failure where a replacement appears to be the only option. Or, you may have a failure that requires replacement of parts or components, in fact, you may not have a failure at all and simply need to refresh your engine. Time, cost and availability all affect the decision-making process. To that end, we will begin with the pro’s and con’s of a new engine from the dealer.

Remanufacturing Process

Long blocks are a good alternative when trying to cull the costs in the search of a new engine. A remanufactured Cummins ISX long block is an ideal replacement for someone who has experienced disastrous internal engine failure but still has good re-useable external components from their old motor.

Our team of over machinists and engine builders come to do a full core tear down, cleaning, inspection, and machining of the engine before it leaves our facility ensuring perfection.

It is important to note that all of our Cummins ISX remanufactured long blocks are assembled with a combination of reman and new parts. We do not recondition or refurbish old engine parts, instead, completely rebuild the old ISX motor back to OEM specs.


Every ISX engine is completely disassembled. Blocks, heads, rods, crankshafts and camshafts are thoroughly cleaned in a chemical jet wash or hot tank to remove all contaminants which can lead to early component and engine failure.


Crankshafts are precision machined to exact tolerances, polished & magnafluxed, then inspected by our quality control department.


Heads are resurfaced to assure a proper sealing surface with the block and a finish compatible with today's new gasket materials. Valve height is mic-d and every head is vacuum tested to assure correct valve seating.


For blocks, we use magnetic particle to inspect for cracks or imperfections. Cylinders are bored, honed and inspected to precise tolerances. Torque plate honing is performed on specific engines to eliminate cylinder head distortion after the head is bolted and torqued to the block. This process eliminates a major cause of engine blow-by. Block surfaces are machined and then inspected to ensure proper finish.


Camshafts are inspected and precisely machined to provide correct lift. Lobs are measured with a micrometre to make sure OEM tolerances are met.


Connecting rods are cleaned, then machined to O.E.M. specifications before being honed to the standard diameter of original equipment for even distribution of stress on the bearings. New bushings are installed and machined in all bushed rods. Every rod is carefully inspected for bend and twist.


Our ISX long block engines receive a standard set of new parts such as pistons and rings, bearings, gaskets and seals, liners. New parts assure consistent performance and reliability throughout the life of your engine. The new parts are a combination of OEM and Aftermarket when available.

Request a Quote

Please fill out the form below with your information and request. A member of our staff will be with you shortly.


To remanufacture is to make as close to new as possible. Wearable parts are automatically replaced.

All ISX core material is closely inspected and checked against original equipment specifications for correct dimensional tolerances. Replacement parts are new or requalified. If new, parts are  made in the same production processes as original equipment. Testing is performed to manufacturer specifications and original production standards.

ISX Cummins

Reman ISX Long Block Parts List:

  • Cylinder Block
  • Complete Loaded Cylinder Head
  • Crankshaft
  • Camshaft
  • Followers/Lifters
  • Pistons
  • Liners
  • Rings
  • Connecting Rods
  • Intermediate Cover
  • Timed Front Gear Group
  • New Upper and Lower Gasket Set
  • **1 Year Warranty

*Note: We can provide new oil pumps, oil coolers, water pumps, turbos, injectors and fuel pumps for additional cost with the long block but will not come assembled to the engine.

**First 6 Months Parts & Labor, Second 6 Months Parts Replacement Only. Ask your sales representative for a full copy of our remanufactured long block warranty.

Cummins ISX Spec Engine Data 
Horsepower 385-600 HP (287-447 KW)
Peak Torque 1450-1850 lb-ft (1966-2508 n.m)
Governed Speed 2000-2100 RPM
Cylinders 6
Clutch engagement Torque 1000 lb-ft (1356 n.m)
Oil System Capacity 14 Gal (52.9 L)
System Weight 3,093 lb (1,403 kg)
Engine (Dry) 3,021 lb (1,370 kg)
Aftertreatment* 72 lb (33 kg)
Cummins ISX Engine

Give us a call today at 844-340-4114 for immediate sales and support for the Cummins 4BT, Cummins 6BT, 6CT, ISC, 855, QSB 4.5 L or CAT 3306. If you have any questions check out our FAQ Page. We are always ready to help or just listen to your crazy off-roading adventures!

Request A Quote


Got an Engine Down?

Discover your best options!
Get our FREE 8-Page Diesel Engine Replacement Guide

    I am looking for an