This is a Cummins ISX15 engine for sale in fairly used condition: a complete 15 litre inline-six heavy-duty diesel out of a Class 8 truck, inspected, tested and ready to ship anywhere in the world. It’s the engine that powered a huge share of Kenworth, Peterbilt, Freightliner, International and Western Star highway tractors through the late 2000s and 2010s.
We confirm the build from your engine serial number (ESN) and data plate, and send photos of the actual engine before you pay.
What’s Included With This 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
- Compression or dyno results where available, photos, and crating on a heavy-duty skid
The aftertreatment (DPF and SCR cans), the ECM and the truck harness aren’t included unless we agree it in writing. If you need the ECM programmed to your truck, ask and we’ll tell you what’s possible.
Cummins ISX15 Specifications
| 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) |
| 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 |
| Condition | Fairly used, tested |
The Cummins ISX line ran from the late 1990s until the X15 replaced it, and it went through several big changes along the way.
Trucks This Engine Fits
- 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, and some Volvo VN models
- Fire apparatus, heavy haulers, dump trucks and road trains in other markets
The ISX moved from twin overhead cams to a single cam with common rail in 2010, and emissions hardware changed more than once. We’ll match the Cummins ISX15 engine for sale to your truck’s ESN and emissions year so the mounts, plumbing and computer line up.
Things We Look At Closely
The weak spots on these are well known among fleet mechanics. EGR coolers and valves give the most trouble, followed by the VGT actuator, the turbo itself, and injectors on high-mileage engines. Some engines also show oil in the coolant from an oil cooler failure. We check every Cummins ISX15 engine for sale for all of that, and we write down anything we find.
Fairly Used, In-Frame or Out-of-Frame Rebuild?
The price here is for a fairly used, tested Cummins ISX15 engine for sale. For trucks running hard every day, we can also quote one with an in-frame overhaul or a full out-of-frame rebuild. Our article on remanufactured vs rebuilt engines explains the trade-offs.
How We Test It
- 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.
No Cummins ISX15 engine for sale goes out without these checks.
Signs It’s Time to Replace Yours
- Heavy blow-by and oil use
- Low compression or a dropped liner
- A spun bearing or bottom-end knock
- A cracked head or block
EGR, DPF and DEF problems on their own almost never mean you need an engine. Get them fixed properly first.
Who Buys This Engine
Owner-operators, small fleets, truck repair shops, dealers rebuilding trade-in trucks, and buyers in Africa, the Middle East, South America and Australia running American trucks. If a truck is down and losing money every day, a Cummins ISX15 engine for sale that’s ready to go is usually cheaper than waiting weeks on a rebuild.
Where Our Engines Come From
Wrecked and retired highway tractors, mostly. A lot of trucks get written off for cab and frame damage while the engine is fine. We record the donor details for every Cummins ISX15 engine for sale, with mileage or hours where we have them.
Fitment Details We Need
Send us these and we’ll confirm the right Cummins ISX15 engine for sale:
- Truck make, model and year
- Engine serial number (ESN) and CPL from the data plate
- Horsepower rating you need
- Transmission and whether you run an engine brake
- Emissions rules where the truck works
Before You Buy Any Used ISX
Whoever you buy from, ask for the ESN and CPL first. Those numbers tell you the build, rating and emissions level, and they decide whether the engine will drop into your truck without a pile of changes. Ask for blow-by or compression results, oil and coolant condition, and photos of the actual engine and data plate. If you can get a run video, even better.
With any Cummins ISX15 engine for sale, find out whether it has had an in-frame overhaul, and if so, when and by whom. Ask about the EGR cooler and the oil cooler, since coolant and oil mixing is one of the costlier problems on these engines. Check whether the ECM goes with it or whether your existing one will need reprogramming.
Look at your own truck as well. If the old engine failed from overheating, find out why. A blocked radiator, a weak fan clutch or a bad thermostat will hurt the new engine too. If oil got into the coolant, flush everything thoroughly before fitting.
Looking After It Once It’s In
A good ISX15 can run a very long way with sensible care. Change oil and filters on time, keep the coolant clean and at the right strength, and use good diesel and fresh DEF. Watch your EGR and DPF readings and don’t ignore warning lights. Let it warm up before pulling hard and cool down after a long climb. Fleet owners who look after a Cummins ISX15 engine for sale that way usually get years of work out of it. Keep oil analysis going if you can, since it catches problems early.
If something changes after fitting, a new noise, smoke or a fault code you can’t clear, call us early. Small problems are cheaper to fix when caught on time, and that’s true of any Cummins ISX15 engine for sale.
Fitting Tips
- Flush the cooling system and replace the radiator if the old engine pushed oil 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.
Shipping
We ship every Cummins ISX15 engine for sale on a heavy-duty skid by truck across North America, and by container to the rest of the world. This engine weighs around 3,000 lb, so you’ll need a forklift or crane where it’s going. Duties and local fees are paid at your end. See our shipping policy.
How Ordering Works
Once you send your details, we check stock and fitment and come back with a written quote. It shows the engine price, what’s included, the warranty terms and the freight cost to your nearest port or address. Nothing is final until you’ve seen photos of the engine and agreed to the quote. After payment we crate the engine, book the freight and send you the tracking details. Most orders leave us within a few working days, though sea freight to some countries takes several weeks door to door. If you’re in a hurry, ask about air freight. It costs more, but it can save a truck or car from sitting idle for a month.
Warranty and Returns
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.
Other Heavy-Duty Engines
We also sell the Caterpillar C13, Caterpillar C15, Cummins M11 and Cummins ISB. Read our page on used diesel truck engines, browse all Cummins engines, or visit the shop.
Questions
Is this engine new?
No. It’s fairly used and tested.
Is it the same as the X15?
No. The X15 replaced the ISX15 from 2017. They’re close relatives but not a straight swap.
Is shipping included?
No. We quote freight with the engine.
How do I order?
Add this Cummins ISX15 engine for sale to your cart, or send your ESN through our contact page. You can also call +1 (209) 733-0882 or WhatsApp +1 209 690 5983. We confirm the fit before you pay.
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