When a highway tractor loses its engine, the clock starts straight away. Loads get missed, drivers sit idle and the truck payment still comes out. If you’re in that spot, we have a Cummins ISX15 engine for sale, tested and ready to ship to you, wherever your truck is.
Ready to buy? See the price, photos and stock for our fairly used Cummins ISX15 engine for sale in the shop.
This guide covers the specs, which trucks use it, how the ISX changed over the years, the common problems, and how buying from us works. We sell complete engines and match them to your engine serial number before you pay.
Table of Contents
Why a Cummins ISX15 Engine for Sale Is Always in Demand
The ISX15 is Cummins’ 15 litre inline six, and for well over a decade it was the engine in a huge share of North American Class 8 trucks. Kenworth, Peterbilt, Freightliner, International, Western Star and some Volvo models all offered it. Owner-operators liked it for its pulling power and the fact that almost any truck shop could work on it.
Cummins replaced it with the X15 in 2017, but there are still enormous numbers of ISX-powered trucks working. Many of them have a lot of life left in the cab, frame and drivetrain. When the engine wears out, putting in a tested Cummins ISX15 engine for sale is usually far cheaper than buying a newer truck, and a lot faster than waiting on an out-of-frame rebuild.
These trucks are also everywhere outside North America. Road trains in Australia, haulers in Africa and the Middle East, and fleets in South America all run American trucks with ISX engines, and they need replacements too.
Cummins ISX15 Engine Specifications
Every Cummins ISX15 engine for sale we list is matched to these figures. The exact rating depends on the engine’s CPL and how it was set up.
| Engine | Cummins ISX15 (ISX 15 litre) |
| Layout | Inline six, turbocharged, charge-air cooled |
| Displacement | 14.9 L (912 cu in) |
| Bore x stroke | 137 mm x 169 mm |
| Valvetrain | Overhead cam, 4 valves per cylinder (24 valves) |
| Fuel system | XPI high-pressure common rail on EPA 2010 and later engines |
| Turbo | Holset variable-geometry |
| Power | 400 to 600 hp depending on rating |
| Torque | 1,450 to 2,050 lb-ft |
| Engine brake | Cummins integral engine brake |
| Emissions | EGR and DPF; SCR with DEF on 2010 and later engines |
| Dry weight | Around 3,000 lb, depending on how it’s dressed |
The Cummins ISX line goes back to the late 1990s, and it changed a great deal along the way.
How the ISX Changed Over the Years
“ISX” covers several quite different engines. Knowing which one you have matters more than almost anything else when you’re buying.
- Early ISX (late 1990s to early 2000s): dual overhead cams, one for the valves and one for the injectors, with HPI fuel injection. No EGR on the earliest ones.
- EGR engines (2002 to 2006): cooled EGR added to meet emissions rules, along with a variable-geometry turbo.
- 2007 to 2009: DPF added. Still dual overhead cam and HPI fuel system. These are the engines many people mean when they say “ISX”.
- EPA 2010 and later ISX15: single overhead cam, XPI common-rail fuel system and SCR with DEF. More fuel-efficient, but a very different engine to work on.
Engines from these groups don’t swap freely. Mounts, plumbing, wiring, the ECM and the aftertreatment all change. That’s why we match every Cummins ISX15 engine for sale to your ESN and CPL, not just the truck’s year.
Which Trucks Use the ISX15?
- Kenworth T660, T680, T800 and W900
- Peterbilt 386, 389, 579 and 587
- Freightliner Cascadia, Coronado and Columbia
- International ProStar, LoneStar and PayStar
- Western Star 4900 and 5700
- Some Volvo VN models
- Fire apparatus, heavy haul, dump trucks and road trains in other markets
Install details vary between truck makers and even between models from the same maker. Send us the truck details along with your ESN and we’ll match the right Cummins ISX15 engine for sale to it.
Finding Your ESN and CPL
The engine data plate is usually on the front gear cover or on the valve cover. It shows the engine serial number (ESN), the CPL (control parts list) and the original rating. The ESN tells us exactly how the engine was built. If the plate is damaged or missing, the ESN is also stamped on the block, and a shop can usually read it from the ECM.
Where Our ISX Engines Come From
Most of our stock comes from highway tractors written off after accidents or retired from fleets. Trucks are often scrapped for cab and frame damage while the engine is perfectly fine. Fleet trucks are useful too, because they’re usually serviced on schedule. We record the donor for every Cummins ISX15 engine for sale, with miles or hours where we have them.
What Comes With Our Cummins ISX15 Engine for Sale
- Block with crank, liners, pistons and rods
- Cylinder head with overhead cam and valvetrain
- Fuel pump, rail and injectors (condition noted on your quote)
- Holset variable-geometry turbo
- EGR valve, cooler and mixer
- Engine brake on most units
- Test results, photos and crating on a heavy-duty skid
The aftertreatment (DPF and SCR), the ECM and the truck harness aren’t included unless we agree it in writing. If your ECM needs reprogramming to the new engine, ask and we’ll tell you what’s involved.
How We Test Every ISX
- Compression or blow-by check on all six cylinders.
- Oil checked for coolant, fuel or metal.
- Coolant checked for oil.
- Turbo checked for shaft play and actuator movement.
- EGR cooler pressure-checked where possible.
- Photos sent to you, and run video on request.
If an engine fails any of these, it never becomes a Cummins ISX15 engine for sale on our site.
Used, In-Frame or Out-of-Frame?
Used
A fairly used Cummins ISX15 engine for sale is tested and sold as it came out of the donor. It’s the cheapest and fastest way to get a truck moving again.
In-frame overhaul
New liners, pistons, rings and bearings fitted with the block still in place. Good value for a solid engine that’s simply worn.
Out-of-frame rebuild
The engine is stripped completely, the block and head machined, and everything rebuilt. The most expensive and slowest option, but closest to new. Our article on remanufactured vs rebuilt engines explains the trade-offs, and long block vs short block covers partial replacements.
Common ISX15 Problems
Fleet mechanics know these engines well, and the weak spots are no secret.
EGR valve and cooler
The biggest source of trouble. EGR coolers crack and leak coolant, valves stick with soot, and the whole system needs regular attention. A leaking cooler can push coolant into the intake, which is bad news for the engine.
VGT actuator and turbo
The turbo actuator fails often enough that most shops keep one in stock. Turbos themselves wear, especially on hard-working engines. Low power and fault codes are the usual signs.
Oil cooler failure
A failed oil cooler can mix oil and coolant. If that’s happened, the whole cooling system has to be flushed properly before a replacement goes in.
Injectors
High-mileage engines wear injectors. On the XPI engines, fuel quality makes a big difference to how long they last.
Aftertreatment
DPF clogging, DEF doser problems and sensor failures are all common on 2010 and later engines. They’re expensive, but they don’t mean the engine itself is finished.
7 Checks Before You Buy Any Cummins ISX15 Engine for Sale
- Get the ESN and CPL. They tell you the build, the rating and the emissions level.
- Match the emissions generation. A 2008 dual-cam ISX and a 2012 ISX15 are not the same engine.
- Ask for blow-by or compression results. Real numbers, not “it ran good”.
- Check oil and coolant. Oil in the coolant or coolant in the oil points to cooler failures.
- Ask about overhaul history. When was it last in-framed, and by whom?
- Get photos and a run video. Of the actual engine, with the data plate visible.
- Read the warranty. Know what’s covered and what you need to do to keep it valid.
A seller with a good Cummins ISX15 engine for sale will answer these straight away. We do it for every engine.
Check your truck as well. A blocked radiator, a weak fan clutch, a failed thermostat or a contaminated cooling system will hurt the new engine just like the old one. A healthy Cummins ISX15 engine for sale can’t fix a problem that’s still sitting in the truck.
Repair or Replace?
A bad EGR cooler, a failed actuator, a worn turbo or a clogged DPF are repairs. Heavy blow-by, a dropped liner, a spun bearing or a cracked head or block are different. When the engine needs an overhaul and the truck needs to work, a tested Cummins ISX15 engine for sale often gets you rolling faster and cheaper.
Ratings and Horsepower
The ISX15 was sold in many ratings, from around 400 hp for fleet work up to 600 hp for heavy haul. The rating is set by the CPL and the ECM calibration. A higher rating isn’t always better. It means more fuel use and more stress. Tell us how the truck works, what it pulls and where it runs, and we’ll suggest the right Cummins ISX15 engine for sale and rating.
Dual-Cam ISX or ISX15: What Owners Prefer
Ask ten truckers which ISX is best and most of the older drivers will say the pre-2010 dual-cam engine. It’s simpler in some ways, it doesn’t need DEF, and a lot of mechanics know it inside out. The trade-off is fuel economy and the DPF-era emissions parts, which gave plenty of trouble.
The 2010 and later ISX15 is a different animal. The XPI common-rail fuel system and single cam make it more efficient and quieter, and the SCR system lets it run cleaner without so much EGR. Fleets running high miles usually prefer it because of the fuel savings.
Neither is wrong. The right Cummins ISX15 engine for sale is the one that matches your truck and its emissions setup, because converting between generations costs a lot. If you’re not sure which one you have, send us the ESN and we’ll tell you.
Fuel Economy and Running Costs
Fuel is the biggest cost for most trucks, and the ISX15 can do well if it’s set up right. Rating, gearing, tyres, aerodynamics and how it’s driven all matter more than people think. A 600 hp engine pulling light loads on flat roads will burn more than it needs to.
DEF adds a small running cost on later engines, and the aftertreatment needs looking after. Budget for filters, oil analysis and the odd sensor. Compared with a breakdown on the highway, those costs are small. When you choose a Cummins ISX15 engine for sale, tell us about the work so we can suggest a rating that won’t waste fuel.
Engine Brake and Transmission Pairing
Most ISX15 engines carry the Cummins integral engine brake, and most of our buyers want it. Check that the brake wiring and switches in your truck match the engine. The transmission matters too. Manual Eaton boxes, automated manuals and Allison automatics all pair with the ISX, but the flywheel, housing and ECM settings need to match. Tell us what’s behind your engine and we’ll set the Cummins ISX15 engine for sale up to suit it.
What Happens on Delivery Day
Your engine arrives bolted to a skid and wrapped against weather. Check the packaging before you sign. If something looks damaged, photograph it and note it on the delivery paperwork. Then compare the engine with the photos we sent.
Keep openings covered and store the engine somewhere dry if it isn’t going in straight away. If anything doesn’t look right, call us before fitting it. Sorting a problem before a Cummins ISX15 engine for sale goes into the truck is far easier than after.
Fitment Checklist
Send us these and we’ll confirm the right Cummins ISX15 engine for sale:
- Truck make, model and year
- ESN and CPL from the data plate
- Horsepower rating you need
- Transmission and engine brake setup
- Emissions rules where the truck works
Emissions and Local Rules
We supply ISX engines with their emissions components as built. Rules on imported engines and emissions vary a lot between countries, so check before you order. We won’t advise removing emissions equipment.
Installation Tips
- Flush the cooling system and replace the radiator if oil got into it.
- New fuel and oil filters, fresh oil and coolant.
- Prime the fuel system before cranking.
- Make sure the ECM calibration matches the engine.
- Check the EGR, DPF and SCR systems and clear old codes.
- Check the fan clutch, thermostat and charge-air cooler.
A good heavy-truck shop fitting your Cummins ISX15 engine for sale will know all of this, but it’s worth making sure.
Looking After Your ISX15
Change oil and filters on time, and run oil analysis if you can. It catches coolant leaks and wear long before they become breakdowns. Keep coolant clean and at the right strength. Use good diesel and fresh DEF. Let the engine warm up before pulling hard and cool down after a long climb.
Fleets that do this usually get years of hard work out of an engine.
Who Buys an ISX From Us
Owner-operators, small fleets, truck repair shops, used truck dealers and buyers overseas running American trucks. If a truck is losing money every day it sits, a ready-to-go engine is often the best answer.
What a Healthy Used ISX15 Looks Like
Low blow-by. Clean oil with no coolant. Clean coolant with no oil. A turbo with no real play and an actuator that works. No cracks or major leaks. Every Cummins ISX15 engine for sale we ship meets those points, and we’ll show you the proof.
ISX Engines Outside North America
A lot of our ISX buyers aren’t in North America at all. American trucks get exported second-hand in big numbers, and many of them end up working much harder than they ever did at home. Road trains in Australia, timber and mining haulers in Africa, and long-distance trucks in the Middle East and South America all run the ISX.
Conditions there are tough on engines. Heat, dust, poor fuel and long stretches between workshops all take their toll. If your truck works in conditions like that, tell us. We’ll look for an engine with a healthy cooling system and fuel system, and we’ll point out anything that might struggle with local fuel quality. Some buyers also prefer the older dual-cam engine because it doesn’t need DEF, which can be hard to find in some areas.
Whatever your situation, we’ll help you choose the Cummins ISX15 engine for sale that suits where and how your truck really works, and we’ll handle the freight to get it there.
Shipping a 3,000 lb Engine
The ISX is heavy. It ships bolted to a heavy-duty skid, by flatbed or LTL freight in North America and in a container overseas. You’ll need a forklift or crane at the other end. If you’re in a remote area, tell us early so we can plan the last part of the trip.
Price: What Affects It
The price of a Cummins ISX15 engine for sale depends on the generation, rating, miles, condition, what’s included and whether you want it used, in-framed or rebuilt. Freight adds to it depending on distance. We quote everything up front. Read our page on used diesel truck engines for more background.
Worldwide Shipping on Every Cummins ISX15 Engine for Sale
We ship by truck across North America and by container to South America, the Caribbean, Europe, the Middle East, Africa, Asia, Australia and New Zealand, with tracking. Duties and local fees are paid by the buyer. See our shipping policy.
Warranty
Every Cummins ISX15 engine for sale is covered against internal mechanical failure, with terms written on your quote. Full details are in our refund and returns policy.
Fleets and Repeat Buyers
If you run a fleet, ask about buying more than one engine. Shipping together lowers freight per engine, and a spare on the shelf can keep a truck earning. Shops can ask to hear first when a good Cummins ISX15 engine for sale comes in.
Why Buy From NJ Global Auto Parts
We test engines, tell you what we find and ship them all over the world. We check the fit before taking payment. You get photos of the actual engine, a written quote, tracking and a warranty in writing. When you call, you talk to people who know heavy diesels.
Other Heavy-Duty Engines We Supply
We also sell the Caterpillar C13, Caterpillar C15, Cummins M11, Cummins ISB and Mercedes OM926. Weighing up a Cat? Read our Caterpillar C13 buyer’s guide and C15 problems and solutions. You can also browse all Cummins engines or the full shop.
Frequently Asked Questions
Is the ISX15 the same as the X15?
No. The X15 replaced the ISX15 from 2017. They’re closely related but not a straight swap.
Will a 2012 ISX15 fit a truck that had a 2008 ISX?
Not easily. The fuel system, cams, wiring, ECM and aftertreatment are all different.
Is a Cummins ISX15 engine for sale cheaper than an in-frame?
Sometimes. It depends on how worn your engine is and what else needs fixing. Ask us for a quote and compare.
Does it come with the ECM?
Not usually, unless agreed in writing.
Is shipping included?
No. We quote freight separately once we know where it’s going.
How do I order?
Add the engine to your cart from the product page, or send your ESN through our contact page. You can also call +1 (209) 733-0882 or WhatsApp +1 209 690 5983.
Get Your Truck Earning Again
A parked tractor makes no money. If you need a Cummins ISX15 engine for sale that’s been tested properly, matched to your ESN and shipped with tracking, get in touch. We’ll confirm the fit, send you photos and give you a straight quote, wherever your truck works.