People who look for a Mercedes-Benz OM366 Engine for sale usually have a truck or bus that earns money, and right now it isn’t earning anything. The OM366 is a working engine. It sits in delivery trucks, tippers, buses, Unimogs and generators, and when it stops, somebody is losing money every day. So the goal is simple: get a good engine, get it fitted and get back to work.
The OM366 has a good name for a reason. It’s a straightforward six-cylinder diesel with a mechanical pump, it’s easy for any diesel mechanic to understand, and parts are available almost everywhere. But plenty of these engines have done huge hours, and a worn one can look fine on a pallet and then smoke, knock or overheat a month after fitting.
We’re NJ Global Auto Parts, and we sell and ship these engines to buyers around the world. This guide covers the versions, the specifications, the vehicles they fit, the checks we make on every Mercedes-Benz OM366 Engine for sale, the common faults, prices, shipping and fitting. It’s what we’d tell you if you called us.
What a Mercedes-Benz OM366 Engine for Sale Actually Is
The OM366 is a 6.0 litre straight-six diesel that Mercedes-Benz launched in 1983. It’s an overhead valve engine with two valves per cylinder, direct injection and an inline injection pump. It’s closely related to the four-cylinder OM364, which is essentially the same engine with two cylinders taken off.
It came in three main forms. The OM366 is naturally aspirated. The OM366A adds a turbocharger. The OM366LA adds a turbo and an intercooler for more power. The letters matter, because the manifolds, turbo plumbing, pump settings and power output differ between them.
If you want the short technical history, the Mercedes-Benz OM366 engine page has the basics, and the OM364 engine page covers its four-cylinder brother. For buying, the main thing is to match the version to your vehicle.
Mercedes-Benz OM366 Engine for Sale: Full Specifications
These are the figures buyers ask for most. Power varies with version and rating.
| Engine code | OM366 (naturally aspirated), OM366A (turbo), OM366LA (turbo intercooled) |
| Layout | Inline six-cylinder diesel |
| Displacement | 5,958 cc (6.0 L) |
| Bore x stroke | 97.5 mm x 133 mm |
| Valvetrain | Overhead valve (pushrod), 2 valves per cylinder |
| Fuel system | Direct injection with inline injection pump |
| Compression ratio | About 16.5:1 to 17.25:1, depending on version |
| Turbocharging | None (OM366), turbo (OM366A), turbo with intercooler (OM366LA) |
| Power | Roughly 100 to 150 kW (130 to 200 hp) across common ratings |
| Torque | Roughly 402 to 640 Nm (296 to 472 lb-ft) |
| Maximum engine speed | About 2,800 rpm |
| Dry weight | About 445 to 470 kg |
| Fuel | Diesel |
| Introduced | 1983 |
Those ranges are wide because Mercedes and its partners built this engine for many markets and many jobs, from buses to generators. The rating on your old engine’s data plate tells you which pump settings and parts you need.
When we quote a Mercedes-Benz OM366 Engine for sale, we tell you the exact version, the donor vehicle and what’s fitted. That’s what you need to know.
Vehicles and Equipment That Use the OM366
The OM366 went into a huge range of vehicles and machines. The most common ones we get asked about are:
- Mercedes-Benz light and medium trucks, including the LN2 and LK ranges, with models like the 1117, 1317, 1517, 1617 and 1620.
- Brazilian-built Mercedes trucks and OF bus chassis, where the OM366 family was used for years.
- Buses and coaches built on Mercedes chassis in several markets.
- Some Unimog models with the turbo versions.
- Generators, pumps and industrial machines.
Because it’s been fitted to so many things, the external parts vary a lot: sumps, flywheel housings, manifolds and brackets. A Mercedes-Benz OM366 Engine for sale from a bus might need its sump or brackets swapped to fit a truck. Send us your vehicle details or the data plate from your old engine, and we’ll match it properly.
OM366, OM366A or OM366LA: Which One Do You Need?
Here’s the plain answer. Buy the version your vehicle was built with.
If you have a naturally aspirated OM366, a like-for-like engine is simplest. Some owners want to go up to a turbo version for more pulling power. That’s possible, but you’ll need the turbo, manifolds, oil lines, a matching injection pump setting and sometimes a better cooling system. Budget for the whole job, not just the engine.
If you have an OM366A or OM366LA, stick with it. The intercooler, charge pipes and pump settings are all part of the package. Putting a lower-powered engine into a vehicle rated for the LA version usually leaves you with a truck that struggles on hills.
Not sure what you have? Photograph the data plate on your old engine and send it to us. We’ll find the right Mercedes-Benz OM366 Engine for sale to match.
OM366 vs OM364 vs OM906: Don’t Mix Them Up
These three get confused more often than you’d think. The OM364 is the four-cylinder version of the same design, found in smaller trucks. The OM906 is a later and more modern six-cylinder with electronic unit pump injection, used in the Atego and similar trucks. It is not a drop-in replacement for an OM366.
When someone offers you a Mercedes-Benz OM366 Engine for sale, check the code on the block and the data plate. A cheap engine that turns out to be the wrong family is no bargain.
Why the OM366 Is Still Everywhere
It’s fair to ask why an engine designed in the early 1980s is still in such demand. The answer is that it does a hard job without needing much in return.
There’s no complicated electronic engine management on most versions. The injection pump is mechanical. The valvetrain is simple pushrods. A mechanic with ordinary tools and some diesel experience can diagnose and repair it almost anywhere, which matters a great deal when a truck breaks down far from a dealer.
Parts supply is another reason. Gaskets, pistons, liners, bearings, pumps and injectors are made by the original suppliers and by aftermarket companies, so a rebuild or repair doesn’t mean waiting months for a part. And because so many trucks and buses used it, there’s a steady supply of donor engines, which keeps the price of a Mercedes-Benz OM366 Engine for sale reasonable compared with newer electronic engines.
Finally, it’s tolerant. It copes with rough roads, heavy loads, heat and fuel that isn’t always perfect better than many modern engines. That’s why operators who know it keep asking for it. When one of their engines finally wears out, they want another Mercedes-Benz OM366 Engine for sale, not something new and unfamiliar.
7 Checks We Make on Every Mercedes-Benz OM366 Engine for Sale
These are the seven things we look at before we quote, and the questions you should put to any seller.
1. Engine Number, Version and Data Plate
We photograph the engine number and the data plate and record the donor vehicle. That confirms the version and rating. If a seller can’t show you these, be careful. On a Mercedes-Benz OM366 Engine for sale, the data plate is your best friend.
2. Compression and Blow-By
We test compression on all six cylinders of each Mercedes-Benz OM366 Engine for sale and compare the readings. Where the engine can be run, we check crankcase blow-by. Heavy blow-by means worn rings or liners and an engine that will use oil and lose power. Even readings and low blow-by are what you want.
3. Injection Pump and Injectors
The inline pump is tough, but it can be worn, leaking or tampered with. A pump that’s been turned up for extra power often leaves the engine smoky and hot. We look for leaks and signs of adjustment, and check the injectors where we can. We tell you what we find.
4. The Turbocharger (A and LA Versions)
On turbo engines we check shaft play, oil on the compressor side and in the intake, and damage to the wheels. A worn turbo on a Mercedes-Benz OM366 Engine for sale isn’t the end of the world, but you should know about it before you pay.
5. Head, Gasket and Cooling
We look for signs of overheating, head gasket leaks and coolant in the oil. An OM366 that has been cooked can look fine and fail later under load, especially in hot climates with heavy trucks. We won’t list an engine with those signs as a good runner.
6. Oil Leaks and Bottom End
We check for leaks at the rear main seal, the sump and the timing cover, look at the oil condition and listen for bottom-end knocks where we can run it. Metal in the oil or a knock means a rebuild, not a quick sale.
7. What’s Included
Injection pump, injectors, turbo, manifolds, starter, alternator, compressor and flywheel housing all change the value and your fitting job. We list everything and show it in photos.
Common OM366 Problems You Should Know About
The OM366 is a durable engine, but high hours and hard work leave marks. Knowing the usual faults helps you judge any Mercedes-Benz OM366 Engine for sale.
Worn rings and liners. After many hours, blow-by rises, oil use goes up and power drops.
Overheating damage. Blocked radiators, slipping fans and low coolant lead to head gasket failures and sometimes cracked heads.
Injection pump wear or tampering. Leaks, poor delivery, or settings pushed too far for more power.
Injector nozzles. Worn nozzles cause smoke, rough running and hard starting.
Turbo oil seals. On A and LA engines, worn seals push oil into the intake or exhaust.
Rear main seal and sump leaks. Common with age.
None of these is unusual on an old commercial diesel. They’re just the things a good seller checks and tells you about. Our older guides on buying an OM366 diesel engine and OM366 truck replacement engines have more background.
Does Your Truck Really Need a New Engine?
Not every smoky OM366 needs replacing. Injector nozzles, a worn turbo or a leaking pump can make a sound engine look sick. These signs usually point to a replacement:
- Low compression on several cylinders.
- Heavy blow-by and high oil use.
- A bottom-end knock.
- Coolant in the oil or oil in the coolant.
- A cracked block or head.
A good diesel mechanic can tell you which side you’re on. If the engine is done, a Mercedes-Benz OM366 Engine for sale is usually the fastest way to get the truck working again, often quicker and cheaper than a full rebuild when you count the downtime.
Rebuilding Your Old Engine vs Buying a Replacement
Operators often ask whether to rebuild the engine they have or buy another one. Both can be right. It comes down to time, money and what’s wrong.
A rebuild makes sense if the block and crank are good, you have a trusted workshop, and the truck can sit for a few weeks. You’ll know exactly what went into the engine.
A replacement makes sense when the block or head is cracked, when the crank is damaged, or when every day off the road costs more than the difference in price. With a Mercedes-Benz OM366 Engine for sale ready to ship, the truck can be working again as soon as the engine arrives and is fitted, and your old engine can be rebuilt later as a spare or sold as a core.
Many of our customers do both: they buy a Mercedes-Benz OM366 Engine for sale to get moving now, then rebuild the old one at their own pace. If you’re weighing it up, tell us what’s wrong with your engine and we’ll give you an honest opinion. Sometimes the cheapest answer is a set of injectors and a turbo, not a new engine at all, and we’ll say so.
Used, Rebuilt or Long Block?
Used. A tested engine from a donor vehicle, sold as described. For most operators who need a truck back on the road quickly, a used Mercedes-Benz OM366 Engine for sale is the sensible choice.
Rebuilt. Stripped, measured and reassembled with new wear parts where needed. It costs more but gives you a fresh start, which suits vehicles that work hard every day.
Long block. The core engine without all the ancillaries. It makes sense if your pump, turbo and accessories are healthy.
See what’s available on our Mercedes-Benz OM366 engine product page.
What Affects the Price of a Mercedes-Benz OM366 Engine for Sale
- Version. LA engines usually cost more than naturally aspirated ones.
- Condition and hours. Even compression and low blow-by add value.
- Completeness. The injection pump and turbo are worth real money.
- Used or rebuilt. Rebuilds include parts and labour.
- Freight. Where it’s going changes the total, so we quote it first.
If a Mercedes-Benz OM366 Engine for sale is far cheaper than the rest, ask why. It might be missing the pump, it might be a different version, or it might be worn out. Better to know now.
Buying From Overseas Without the Worry
Many of our customers are fleet operators and workshops on other continents. Buying a heavy engine you can’t see in person takes trust. Ask for photos of the actual engine, the engine number and data plate, the test results in writing, and a confirmed freight quote with the delivery point. We provide all of that as standard with every Mercedes-Benz OM366 Engine for sale.
Have your mechanic confirm the version and the parts they’ll need from the old engine before you order. It saves time when the crate arrives.
Shipping a Mercedes-Benz OM366 Engine for Sale Worldwide
We ship every Mercedes-Benz OM366 Engine for sale worldwide. Each engine goes out drained, with openings sealed, strapped to a pallet or crated, with the injection pump and turbo protected.
Sea freight is the usual choice for a heavy diesel. Air freight is possible for urgent jobs. We confirm cost and arrival port before you commit.
You’ll get a commercial invoice, packing list and bill of lading or airway bill. Your customs broker handles duty and taxes. Engines are classified under the HS system run by the World Customs Organization, so your broker will know the paperwork.
Read our shipping policy for details, and our refund and returns policy for what happens if something arrives damaged.
Buying for a Fleet
Some of our customers run ten, twenty or fifty trucks on the same engine. If that’s you, talk to us about more than one engine at a time. Buying a spare Mercedes-Benz OM366 Engine for sale to keep on the shelf can save weeks of downtime the next time a truck goes down, and shipping two engines in one crate or container usually costs less per engine than shipping them one at a time.
Tell us which versions you run, which vehicles they’re in and roughly how many hours they’ve done. We’ll tell you what we can supply and when. We can also help you plan which parts to keep from each old engine, because pumps, turbos and starters from a dead engine are often worth reconditioning as spares.
What Arrives in the Crate
Every Mercedes-Benz OM366 Engine for sale we ship comes with a copy of the inspection summary, the photos we took before packing and a list of what’s fitted. Fluids are drained, openings are sealed, and the injection pump, turbo and any fragile fittings are protected. If you can, check the crate before you sign for it and take photos while unpacking. If anything looks wrong, tell us straight away.
Fitting Tips From Diesel Mechanics
These are the things good mechanics do when they fit a Mercedes-Benz OM366 Engine for sale:
Fix the cooling system first. If the old engine overheated, flush or replace the radiator, check the fan and replace the thermostat and hoses.
Clean the intercooler and pipes on LA engines if the old turbo failed.
New filters and fluids. Oil, oil filter, fuel filters and air filter.
Bleed the fuel system properly before cranking for long.
Check the pump timing and settings match your vehicle’s rating.
Take it easy at first and change the oil early.
Looking After the OM366 Once It’s Working
A working diesel lasts as long as it’s looked after. These habits make a big difference once your new engine is in:
Change the oil on time with a good diesel-rated oil. Soot builds up quickly in the oil of a hard-working diesel.
Keep the air filter clean. Dust is the fastest way to wear out rings and liners, especially on building sites and dirt roads.
Watch the temperature gauge. Fix radiator, fan and thermostat problems immediately. Overheating is what kills most OM366 heads.
Let turbo engines idle briefly after hard work so the turbo bearings can cool.
Use clean fuel and drain the water separator regularly. Water and dirt wear the pump and injectors.
Don’t turn the pump up. More fuel gives more power for a while and a shorter engine life for sure.
Follow those rules and a good Mercedes-Benz OM366 Engine for sale can keep working for many more years.
Questions to Ask Before You Pay
- Which version is it: OM366, OM366A or OM366LA?
- Can I see the engine number and data plate?
- What were the compression readings, and how was blow-by?
- Has the injection pump been adjusted?
- Are the pump, injectors and turbo included?
- Is it used, rebuilt or a long block?
- What does the freight quote include?
We answer all of these for each Mercedes-Benz OM366 Engine for sale on our site.
Other Truck Engines We Supply
If you run newer Mercedes trucks, see our Mercedes-Benz OM926 engine. For other makes, there’s the Cummins 6BT engine and the Isuzu 6HE1 engine. Browse Mercedes engines or our full used engines range.
For official truck information, visit Mercedes-Benz Trucks.
Why Buy From NJ Global Auto Parts
We match each Mercedes-Benz OM366 Engine for sale to your vehicle before you pay. You get real photos, a written summary and a clear list of what’s included. We point out the flaws as well as the good points, and we quote freight up front, wherever you are.
If we don’t have the right engine, we’ll say so. Read more about us or visit the shop.
Frequently Asked Questions
How much power does the OM366 make?
Common ratings run from about 100 to 150 kW (130 to 200 hp), depending on version.
Can I replace an OM366 with an OM366LA?
Yes, but you’ll need the turbo, intercooler, pipework and matching pump settings. It’s more than a swap.
Is your Mercedes-Benz OM366 Engine for sale used or rebuilt?
We offer both. Each listing and quote says which.
Does it come with the injection pump?
That depends on the engine. We list what’s fitted and show it in photos.
Do you ship to my country?
Yes. We ship every Mercedes-Benz OM366 Engine for sale worldwide by sea or air, with freight quoted before you pay.
What if it arrives damaged?
Contact us right away with photos, and we’ll sort it out with you.
A Mercedes-Benz OM366 Engine for sale should come with real photos, honest notes and someone who understands working diesels. That’s what we give every buyer. Send us your vehicle details or data plate through the contact page, and we’ll tell you what we have and what it’ll cost to get it to you.