The N14 is the engine a lot of drivers still compare everything else to. It pulls hard at low revs, it is easy to work on and, looked after properly, it just keeps going. If you need one for your truck, bus or machine, we have a Cummins N14 engine for sale, tested, matched to your engine and shipped to buyers anywhere in the world.
Ready to buy? See the price, photos and stock for our fairly used Cummins N14 engine for sale in the shop, or send your engine serial number through our contact page and we will reply with a written quote.
We sell engines, and only engines. A Cummins N14 engine for sale is one of the steady requests we get from owner operators, logging and haulage companies, and equipment yards who want to keep a proven truck working.
In this guide you will find the N14 specs, the trucks it fits, the difference between the mechanical, Celect and Celect Plus versions, how to read the CPL number, the common problems, how we test and how buying from us works.
Why a Cummins N14 Engine for Sale Is Still a Smart Buy
The N14 grew out of the famous Cummins 855 family, the Big Cam and NTC engines that powered trucks for decades. Cummins brought out the N14 at the end of the 1980s with a stronger build and more power, and in the early 1990s added electronic control with the Celect system. Later came the Celect Plus, which many drivers consider the best version.
The engine was built until around 2001, when the ISX took over in most trucks. That makes every N14 at least twenty years old now, yet demand has not gone away. The reason is simple. A Cummins N14 engine for sale gives you big torque, no EGR, no particulate filter and no DEF. It is easy to rebuild, parts are everywhere, and nearly every diesel mechanic has worked on one.
For buyers in countries with older emissions rules, or anyone keeping a classic long nose truck on the road, that combination is hard to beat.
Cummins N14 Engine Specifications
These are the common figures for truck versions. Ratings vary with the year, the CPL and what the engine was built for, so we always confirm details from the data plate before quoting any Cummins N14 engine for sale.
| Engine type | Inline 6 cylinder, four stroke turbo diesel |
| Displacement | 14.0 litres (855 cubic inches) |
| Bore x stroke | 140 mm x 152 mm (5.5 in x 6.0 in) |
| Valve train | Pushrod, 4 valves per cylinder, two cylinder heads per three cylinders |
| Fuel system | Mechanical PT (early N14) or Celect electronic unit injectors |
| Versions | N14 Mechanical, N14 Celect, N14 Celect Plus |
| Horsepower | About 310 to 525 hp depending on rating |
| Peak torque | Up to about 1,850 lb-ft on top ratings |
| Dry weight | Roughly 2,700 to 2,900 lb |
| Production | Late 1980s to around 2001 |
Note the head layout. Unlike most rivals, the N14 uses separate cylinder heads, which makes some repairs cheaper because you do not have to replace one large head.
Which Trucks and Machines Use the N14?
The N14 was offered by most North American truck makers and went into many trucks sold around the world:
- Peterbilt 377, 378, 379 and 385
- Kenworth W900, T600 and T800
- Freightliner FLD 120, Classic and Century Class
- Western Star 4900 and 5900 series
- International 9000 series and some Volvo VNL and Mack builds
- Buses, fire trucks and motorhomes
- Industrial and marine versions for pumps, generators and boats
You will find many Kenworth T600 and Peterbilt trucks still working with an N14. Because the engine went into so many chassis, mounts, oil pans and accessories vary. That is why we always ask about your truck before we quote a Cummins N14 engine for sale.
N14 Mechanical vs Celect vs Celect Plus
N14 Mechanical. The early N14 used the Cummins PT fuel system, with no engine computer. It is the simplest version, easy to work on in the field and still loved in places where electronics are hard to fix.
N14 Celect. In the early 1990s Cummins added the Celect electronic system, which controls the injectors with an ECM. It brought better fuel economy and smoother running, but early Celect electronics had their share of problems.
N14 Celect Plus. From the mid 1990s the Celect Plus improved the electronics and the wiring and raised the power. Many Celect Plus engines have red valve covers, which is why drivers call them red tops. If you want a Cummins N14 engine for sale with the best balance of power and reliability, the Celect Plus is usually the one.
Reading the CPL and Serial Number
Cummins engines carry a data plate with the engine serial number and the CPL, or Control Parts List number. The CPL tells you how the engine was built: the fuel system, the turbo, the rating and many of the parts. Matching the CPL is the most reliable way to make sure a replacement fits and behaves like your old engine.
When you ask about a Cummins N14 engine for sale, send us the CPL and serial number from your old engine if you can read them. If the plate is missing, the truck VIN and year still help us narrow it down.
Known N14 Weak Spots
The N14 is a strong engine, but even a good Cummins N14 engine for sale has some areas worth checking:
- Injector o-rings and cups. Worn seals can let fuel into the oil or coolant into the combustion area.
- Early Celect electronics. Older ECMs and harnesses can cause stalling and running faults.
- Liner cavitation. Poor coolant care pits the liners from the outside. Good coolant and correct additive levels prevent it.
- Head cracks. Overheating can crack the heads. Since they are separate, the fix is usually more affordable.
- Oil cooler leaks. A leaking cooler can mix oil and coolant.
- Jake brake wear. Engine brake parts wear with age and should be checked.
How We Test Every Cummins N14 Engine for Sale
Before any Cummins N14 engine for sale leaves our yard, we:
- Record the serial number, CPL and rating from the plate.
- Check compression or run a cylinder cut-out test where the engine runs.
- Inspect the oil for coolant, fuel or metal.
- Run the engine where possible and check oil pressure, blow-by and smoke.
- Check the turbo for shaft play and oil leaks.
- Look at the engine brake and overhead when covers are off.
- Photograph the engine from every side, including the data plate.
You get the results and photos with your quote. Learn more in our guide to tested used engines.
What Comes With the Engine
Most of our N14 stock is sold as a complete engine, which normally includes the block, heads, injectors, turbo, manifolds, oil pan and front cover. Celect engines may come with the ECM. Accessories like the air compressor, fuel pump, starter and alternator vary.
If you only need a long block, ask for that price. It often costs less when your old accessories are still in good shape.
Used, Rebuilt or Remanufactured?
Used engines come out of working trucks and are sold after testing. They cost the least.
Rebuilt engines have new wear parts such as liners, pistons, rings, bearings and gaskets fitted.
Remanufactured engines are restored to factory measurements throughout and cost the most.
Most buyers pick a tested used Cummins N14 engine for sale to get the truck working for the lowest cost. If you are keeping the truck for many years, a rebuilt engine can be worth the extra. We are happy to help you decide.
7 Checks Before You Buy Any Cummins N14 Engine for Sale
1. Match the CPL
Before you pay for a Cummins N14 engine for sale, compare its CPL with your old engine. It is the best guide to fit and setup.
2. Know which version you need
Mechanical, Celect and Celect Plus engines are wired and fuelled differently. Do not mix them up.
3. Ask for test results
A seller who tested their Cummins N14 engine for sale can show you compression or cut-out results and oil pressure.
4. Check for oil and coolant mixing
Ask directly about coolant in the oil or oil in the coolant.
5. Ask for real photos
Insist on photos of the actual engine and data plate.
6. Know what is included
Two listings for a Cummins N14 engine for sale can look alike and still be very different deals once you count the turbo, injectors, ECM and accessories.
7. Read the warranty
Know the length and what it covers. See our used engine warranty guide.
What Affects the Price
The price of a Cummins N14 engine for sale depends on the version, the rating, the mileage, the condition and what comes with it. Celect Plus engines with high ratings and good test results usually cost the most. Mechanical engines can sell at a premium in places that prefer them. Complete engines cost more than long blocks.
Freight is also part of the total, since a crated N14 is heavy. We include freight options with every quote. For more, read our guide to replacement engine cost.
How Long Does an N14 Last?
A well kept N14 can go a million miles or more before needing an overhaul. Engines that die early usually overheated, ran with dirty air filters, missed oil changes or idled for hours. Hot and dusty conditions make air and coolant care even more important.
When you look at a Cummins N14 engine for sale, how it was serviced matters more than the miles on the ECM. That is why we test instead of trusting the numbers alone.
Habits that keep an N14 strong
- Change oil and filters on time with a good heavy duty oil.
- Keep coolant clean and test the additive level.
- Do overhead adjustments at the right intervals.
- Replace air filters often in dusty work.
- Fix overheating straight away.
Rebuild Your Old N14 or Replace It?
An in-frame rebuild keeps your own engine and can look cheaper at first. But the truck is off the road while the work is done, and once the engine is open you may find a damaged crank, block or cam that adds to the bill.
Swapping in a tested Cummins N14 engine for sale is usually faster. You know the condition before you pay, and the truck can be working again in days. Your old engine may also have core value. If your block or crank is damaged, or the truck earns money every day, replacing usually makes more sense. Tell us what happened and we will give you an honest view.
Industrial and Marine N14 Engines
Some requests for a Cummins N14 engine for sale come from outside trucking. The N14 powered generators, pumps, crushers and boats. These versions often have different flywheels, cooling and governors from truck engines. Tell us what the engine will drive and we will look for the right match.
Signs Your Truck Needs a Replacement Engine
Not every problem means the engine is finished. A bad injector, a leaking oil cooler or a tired turbo can all be fixed on their own. But some signs usually point to a bigger job, and that is when buyers start looking for a Cummins N14 engine for sale.
- Heavy blow-by. Lots of fumes from the breather under load often means worn rings or liners.
- Knocking from the bottom end. A deep knock that gets louder with load can mean a spun bearing or crank damage.
- Metal in the oil. Shiny flakes on the filter or drain plug are a warning you should not ignore.
- Coolant and oil mixed together. Milky oil or oil in the radiator points to a cooler, liner seal or head problem, and sometimes a cracked block.
- Low oil pressure when warm. Often a sign of worn bearings.
- Constant overheating. If the cooling system is fine and it still overheats, the engine may be damaged inside.
If you see more than one of these at once, it is usually time to get a quote. Send us what you are seeing and we will tell you honestly whether a repair or a replacement makes more sense.
The N14 Engine Brake
Many N14 engines carry a Jacobs engine brake, often called a jake brake. It uses the engine to slow the truck on long downhill runs, saving the service brakes. For trucks working in hills and mountains it is almost a must.
When you buy a Cummins N14 engine for sale, check whether the engine brake housings are fitted and whether the wiring and switches in your cab match. The brake housings sit on top of the engine under the valve covers, so they usually come with a complete engine. We note on every quote whether the engine brake is included.
Engine brake parts wear like anything else. Loose lash settings, worn slave pistons or bad solenoids reduce braking. These are simple to adjust or replace, but it is good to know their condition up front.
Cooling System Care for the N14
More N14 engines are killed by coolant problems than by anything else. The wet liners in this engine sit directly in coolant, so the coolant has to do two jobs: carry heat away and protect the outside of the liners from pitting. If the additive level drops too low, tiny bubbles in the coolant slowly eat holes through the liner wall. Once a hole goes through, coolant gets into the oil and the engine is in trouble.
The fix is boring but it works. Use a good heavy duty coolant, keep it at the right strength, test the additive level at every service and replace the coolant filter on time. Keep the radiator clean and the fan clutch working. If you have just fitted a Cummins N14 engine for sale from us, start it off with fresh coolant and a clean system, and it will thank you for years.
Also watch the thermostats and the water pump. A stuck thermostat or a weak pump can push temperatures up fast, and overheating is how heads crack and liners lose their seal.
A quick cooling checklist
- Test coolant strength and additive level at every service
- Change the coolant filter on schedule
- Clean the radiator fins and check the fan clutch
- Replace thermostats and hoses when they age
- Fix any coolant loss straight away
Worldwide Shipping
We ship engines to buyers across Africa, Europe, the Middle East, Asia, Latin America, the Caribbean and North America. Each engine is drained, sealed, strapped or crated and shipped by sea or road freight with tracking. We prepare the export paperwork and work with your clearing agent.
See our shipping policy for timing, and ask for a port or door price with your quote.
Installation Tips
When your Cummins N14 engine for sale arrives, these steps help:
- Flush the radiator and cooling system before fitting the new engine.
- Clean the charge air cooler if the old engine failed with oil or metal in the intake.
- Fit new filters, add fresh oil and prime the fuel system.
- On Celect engines, check the ECM settings suit your truck.
- Idle to temperature and check for leaks before the first load.
New to buying engines online? Read how to buy a used engine online.
N14 vs ISX and Other Engines
The N14 was replaced in most trucks by the ISX around 2001. The ISX has more power and better economy but more complicated electronics, and later versions added EGR and aftertreatment. If you are thinking about a newer Cummins, read our guide to the Cummins ISX15. For background on the company, see the Cummins page, and for a classic N14 truck see the Peterbilt 379.
The N14 competed head to head with the Caterpillar 3406E and the Detroit Diesel Series 60. We sell all three.
Questions We Ask Before Quoting
To find the right Cummins N14 engine for sale for you, we usually ask:
- What is the CPL and serial number on your old engine?
- What truck or machine is it going into, and what year?
- Do you need mechanical, Celect or Celect Plus?
- Complete engine or long block?
- Which port or city should we ship to?
Other Heavy Diesel Engines We Sell
We also supply the Detroit DD15, the Volvo D13 and the Caterpillar C13. See all our used diesel truck engines.
Why Buy From NJ Global Auto Parts
We test our engines, describe them honestly and ship worldwide. We confirm the fit before you pay. Every Cummins N14 engine for sale from us comes with real photos, a written quote, tracking and a written warranty. Our refund and returns policy is open to read before you order.
Frequently Asked Questions
What years was the N14 built?
From the late 1980s until around 2001 in trucks.
What is a red top N14?
Drivers use the name for N14 Celect Plus engines, many of which have red valve covers.
Can I put a Celect Plus in a truck that had a mechanical N14?
Yes, but you need the ECM, harness and some cab wiring. Ask us before you buy.
Does your Cummins N14 engine for sale include the ECM?
Some engines do. The quote always says.
Do you ship worldwide?
Yes, to most countries, with export paperwork handled.
How do I pay?
Bank transfer only. Details come with your written quote.
How do I get a quote?
Send your CPL, serial number or truck details through our contact page or call +1 (209) 733-0882.
Keep Your Truck Earning
A parked truck costs money every day. If you need a Cummins N14 engine for sale that has been tested, matched to your truck and shipped with tracking, get in touch today. We will confirm the fit, send photos and give you a straight price, wherever you are.