This is a Cummins ISL engine for sale in fairly used condition: a complete 8.9 litre inline six turbo diesel, inspected, tested and ready to ship anywhere in the world. It powers Freightliner M2 trucks, transit and school buses, fire engines, refuse trucks and diesel pusher motorhomes.
We match the engine to your serial number and CPL number, and we send photos of the actual unit before you pay.
What Comes With This Cummins ISL Engine for Sale
- Block with crankshaft, liners, pistons and connecting rods
- Cylinder head, camshaft and valve train
- Fuel system to suit the generation: CAPS or high pressure common rail with injectors
- Turbocharger, including the VGT actuator on later engines
- EGR parts on 2004 and later engines where fitted
- Oil cooler, water pump, gear housing, oil pan and flywheel housing
- Photos, test notes and a skid or crate for shipping
The ECM and harness are included only when agreed in writing. Aftertreatment parts such as the DPF and SCR are not included unless listed on your quote. Long blocks are available on request.
Cummins ISL Specifications
| Engine | Cummins ISL / ISL9 |
| Layout | Inline six, four stroke, turbocharged, charge air cooled |
| Displacement | 8.9 litres (540 cubic inches) |
| Bore x stroke | 114 x 144.5 mm (4.49 x 5.69 in) |
| Fuel system | CAPS on early engines, high pressure common rail on later engines |
| Power | About 250 to 400 hp on common ratings |
| Torque | Up to about 1,250 lb-ft depending on rating |
| Compression ratio | About 16.6:1 |
| Dry weight | About 1,550 lb |
| Oil capacity | About 29 US quarts |
| Engine controllers | CM550, CM850, CM2150, CM2250 |
Vehicles This Engine Fits
Each Cummins ISL engine for sale in our stock is matched to one of these applications:
- Freightliner Business Class M2 106 and 112
- Kenworth and Peterbilt medium and regional trucks
- International medium trucks with the ISL9 in later years
- Transit buses, motorcoaches, shuttle and school buses
- Fire engines and rescue trucks
- Refuse trucks, concrete mixers and vocational trucks
- Diesel pusher motorhomes
Not sure? Send your serial number and we will check for a Cummins ISL engine for sale that fits.
Which ISL Generation Do You Have?
Early ISL (CM550)
Late 1990s to early 2000s. CAPS fuel system and simple emissions equipment.
EPA 2004 ISL (CM850)
Cooled EGR and a variable geometry turbo arrive on many engines.
EPA 2007 ISL (CM2150)
A diesel particulate filter is added, with updated electronics.
ISL9 (CM2250)
From 2010. SCR with DEF joins the EGR and DPF. Higher ratings and better fuel economy.
ISL G and QSL9
The ISL G is the natural gas version for buses and refuse trucks. The QSL9 is the industrial and marine version.
You cannot freely swap an engine from one generation into a vehicle built for another, because the wiring, controller, aftertreatment and transmission programming all expect a certain engine. Send your serial number and we will match the right Cummins ISL engine for sale.
What Is a CPL Number?
CPL stands for Critical Parts List. The four digit number on the data plate tells exactly how the engine was built: pistons, injectors, turbo, fuel system and rating. Two engines with different CPL numbers can need different parts to work in the same vehicle.
The data plate is usually on the gear cover or rocker cover. If it is missing, the serial number is stamped on the block, and we can often work out the build from that and from photos.
Condition and Testing
Every Cummins ISL engine for sale goes through the same checks before we quote it:
- Serial number, CPL and rating recorded
- Running test or compression test where possible
- Oil and coolant checked for contamination
- Turbo, VGT actuator and EGR parts inspected
- Fuel system checked for leaks
- Block and head inspected for cracks and old repairs
- Photos taken from every side and sent to you
If an engine is sold as a core or needs work, the quote says so plainly.
What Our Condition Notes Mean
- Tested runner. Run or compression tested and performed well. Ready to fit.
- Good used. Sound engine with normal wear for its age.
- Core. Sold for rebuilding and priced that way.
Common ISL Problems and How to Avoid Them
CAPS fuel pump on early engines
The CAPS pump is known for wear and leaks. Many have been rebuilt or replaced over the years.
EGR valve and cooler
On 2004 and later engines the EGR valve sticks with soot and the cooler can crack and leak coolant. Watch for coolant loss and white smoke.
VGT turbo actuator
The variable geometry turbo can stick or its actuator can fail, causing low power and fault codes.
DPF and SCR
Buses and short haul trucks that idle a lot clog the diesel particulate filter. ISL9 engines also depend on a healthy SCR and DEF system.
Injectors and fuel quality
Common rail injectors need clean fuel. Water and dirt wear them fast.
Fix the root cause first so your Cummins ISL engine for sale does not meet the same end as the old one.
Signs You Need a Replacement Engine
- Bottom end knock from a bearing failure
- Heavy blow by and oil use
- Coolant in the oil after the EGR cooler and oil cooler have been ruled out
- Low compression across several cylinders
- Damage after a dropped valve or turbo failure
Send us the symptoms and shop reports and we will tell you honestly whether to repair or buy a Cummins ISL engine for sale.
ISL Compared With ISC, ISB and ISX
The ISC is the related 8.3 litre engine. The ISB is the smaller 5.9 or 6.7 litre engine, and the ISX is the big 15 litre heavy duty engine. Each fits a different class of vehicle, so replace like with like. For heavy trucks see our Cummins ISX15.
A Note on the ISL G
The ISL G uses spark ignition, a different head, pistons and fuel system. A diesel ISL will not go into a gas vehicle without a full conversion. If your fleet runs on gas, tell us when you ask for a quote.
Long Block or Complete Engine?
A long block is the block, crank, liners, pistons, rods, head, camshaft and valve train. A complete engine adds the turbo, fuel system, EGR parts, water pump and usually the starter and alternator.
The price on this page is for a complete Cummins ISL engine for sale. Ask us if you want a long block price instead.
Why Choose a Fairly Used ISL
A clean used Cummins ISL engine for sale is the fastest and cheapest way back on the road. It costs far less than a remanufactured unit, and buses and RVs with the ISL are often worth far more than the cost of a replacement engine. The ISL is strong, common and easy to service.
What to Replace While the Engine Is Out
- Engine and transmission mounts
- Radiator and heater hoses and clamps
- Charge air cooler hoses
- Fan drive if worn
- Belts and tensioners
- Fuel filters and water separator
These small jobs protect your Cummins ISL engine for sale from avoidable failures.
Notes for Bus and Fleet Operators
Transit buses and refuse trucks do constant stop and start work with long idling and high heat. That is hard on EGR parts, turbos, the DPF and cooling systems.
We can quote several engines at once and ship them in one container to cut freight cost. Tell us how many vehicles you run and which generations they use.
Notes for RV Owners
RV engines sit for months and then climb mountain passes at full load, which is hard on injectors, seals and cooling parts. When you fit a Cummins ISL engine for sale in a coach, check the rear radiator, charge air cooler, fan drive and transmission cooler too. Send the coach make, model, year, serial number and CPL.
Parts Supply for the ISL
Cummins has a dealer network in most countries, and there is a large aftermarket for ISL overhaul kits, heads, turbos, injectors, EGR parts and water pumps. Most diesel shops know the engine well, which makes a Cummins ISL engine for sale a low risk buy almost anywhere.
Diesel ISL in Hot and Remote Regions
Many buyers outside North America run ISL powered buses and trucks imported second hand. In hot climates and on rough roads, the cooling system and the fuel system take the most punishment. Fit a good quality fuel water separator, keep spare fuel filters on hand and check the radiator often. Where fuel quality is poor, older engines and engines without SCR are sometimes easier to keep running.
Tell us where the vehicle works and what fuel is available, and we will recommend the Cummins ISL engine for sale that suits those conditions best, together with the spare parts worth sending in the same crate. A few filters, a gasket set and a set of belts in the box can save weeks of waiting later.
Before You Fit Your Cummins ISL Engine for Sale
- Fix the cause of the old engine failure first.
- Clean or replace the radiator and charge air cooler.
- Check the EGR cooler and aftertreatment if the old engine had coolant or soot problems.
- Fit new fuel filters and prime the system.
- Use the oil grade Cummins lists for your emissions level.
- Make sure the ECM calibration matches the vehicle and transmission.
Simple Care for a Long Engine Life
- Change oil and filters on time.
- Keep fuel clean and drain water separators.
- Avoid long idling and let the DPF regenerate.
- Use quality DEF on ISL9 engines.
- Fix coolant leaks early, especially around the EGR cooler.
Price, Payment and Warranty
The price shown is for a fairly used Cummins ISL engine for sale in good running condition. The final figure can change with the generation, the parts included and the shipping destination, so we always send a written quote first.
Payment is by bank transfer only. See our billing terms. Each engine comes with a written warranty, explained in our used engine warranty guide, and our refund and returns policy is open to read before you order.
Worldwide Shipping
We ship every Cummins ISL engine for sale by sea or air freight to Africa, the Middle East, Asia, Australia and the Pacific, Europe, the Caribbean and the Americas.
The engine is drained, every opening is capped, and it is bolted to a skid or packed in a crate. You receive tracking, the commercial invoice and the packing list. See our shipping policy for details.
Packing Details
Before the engine leaves, we drain oil and coolant and cap every opening: intake, exhaust, turbo ports, fuel lines and oil lines. Loose parts are bagged and tied to the engine so nothing goes missing.
For sea freight the engine is bolted to a heavy skid or packed in a wooden crate. For air freight the packing is lighter but just as secure. Each Cummins ISL engine for sale is photographed again once packed, so you can see exactly how it was sent.
Fleet and Multiple Engine Orders
Bus companies and vocational fleets often need several engines, or want a spare on the shelf for the next breakdown. We can quote several engines together and ship them in one container, which lowers the freight cost per engine.
Tell us the generations, CPL numbers and ratings you run, and we will plan a supply of Cummins ISL engine for sale units that fits your budget and timeline.
Notes for Fire Departments
Fire apparatus often sits for long periods, then runs hard with heavy pump loads. Many engines carry fire pump drives and special ratings. Send us the apparatus builder, year and the engine data plate, and we will match a Cummins ISL engine for sale with the right rating and front end so the pump drive and cooling work as designed.
Matching the Transmission
Most vehicles that take a Cummins ISL engine for sale use an Allison automatic, and the engine and transmission talk to each other through the electronics. When the replacement has a different rating or controller, the transmission may need reprogramming to shift properly. Tell us your transmission model with your request and we will flag anything to check during fitting.
Common Questions From Workshops
Workshops often ask whether we can supply the ECM programmed to the vehicle, whether the injectors are tested, and whether we can match a particular CPL exactly. The answer depends on the engine in stock, so we confirm each point in writing on the quote. If an exact CPL match is not available, we tell you which parts differ and whether your old parts can move across. That honesty is why repeat workshop buyers come back to us for each Cummins ISL engine for sale they need.
When Your Engine Arrives
- Photograph the skid or crate before opening it.
- Check the serial number against your quote.
- Make sure every listed part is there.
- Turn the crank by hand to confirm it moves freely.
- Contact us within the time on your quote if anything does not match.
Buying an Engine From Abroad Safely
- Ask for photos of the actual engine and its data plate.
- Ask for test results or a running video.
- Get the parts list and warranty in writing.
- Read the seller’s policies before paying.
We do all of this as standard. Read how to buy a used engine online and our replacement engine cost guide for more.
How to Order
- Send your serial number, CPL and vehicle details through our contact page, or call +1 (209) 733-0882.
- Get photos and a written quote with shipping.
- Pay by bank transfer.
- We pack and ship with tracking.
For the full background on this engine, read our Cummins ISL engine for sale guide.
Talk to Someone Who Knows Engines
When you contact us, you speak with people who handle engines every day. Tell us what happened to the old engine, what the vehicle does and where it works. We will recommend the right engine, the parts worth changing while it is out and the best shipping option. If a repair makes more sense, we will say so.
Who Buys This Engine From Us
Transit operators, refuse and vocational fleets, fire departments, owner operators, RV owners, diesel workshops and engine importers. Whether you need one Cummins ISL engine for sale or a container, each engine is quoted with photos and honest notes.
Related Engines
We also sell the Caterpillar C7, the Cummins N14, the Isuzu 6HK1 and the Hino J05E. Browse all Cummins engines or our full shop.
Frequently Asked Questions
Is this a complete engine?
Yes. This Cummins ISL engine for sale is a complete engine. Long blocks are available on request.
What is the difference between the ISL and ISL9?
The ISL9 is the 2010 and later version with SCR and DEF and a newer controller.
Is the ECM included?
Only if agreed in writing on your quote.
How do I pay?
Bank transfer only.
Can I see the engine before paying?
Yes. We send photos and test notes for the actual Cummins ISL engine for sale first.
Ready to get your fleet moving? Contact us today for photos and a price on this Cummins ISL engine for sale.
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