MTU Fuel Injector Part Number: How to Find the Right Injector
If you’re trying to find an MTU fuel injector part number, the first thing I would say is: don’t start by buying the first injector that looks right.
That happens more often than you would think.
Someone removes an injector from an MTU engine, searches online, sees another one with almost the same shape and connections, and assumes it must fit.
Sometimes it does.
Sometimes it doesn’t.
And with fuel-injection parts, “almost the same” is not a good enough reason to order.
The safest place to start is with three things:
The complete MTU engine model, the engine serial number and the injector number already fitted to the engine.
If you still have the old injector in your hand, keep it.
Don’t throw it away and don’t clean it so aggressively that you remove the markings.
Take a few good photographs and write down every number you can see.
That old injector is usually the best clue you have.
You can also browse our marine spare-parts catalog or request a quotation if you already know the injector reference you need.
Where is the part number on an MTU injector?
It depends on the injector.
You may find the number engraved into the body, stamped into the metal, printed on a label or shown as a manufacturer, exchange or remanufactured reference.
The important thing is to copy it exactly.
If the number starts with zeroes, keep the zeroes.
If it has letters, keep the letters.
If there is a suffix, keep the suffix.
Don’t shorten it because part of the number looks unimportant.
With older MTU parts especially, one letter or one digit can completely change the direction of the search.
I only know that it’s an MTU Series 2000 injector. Is that enough?
Not really.
It helps, but it’s still too broad.
The Series 2000 family includes a lot of different engines and configurations.
There is a big difference between saying:
“I need an MTU Series 2000 injector.”
and saying:
“I need an injector for an MTU 16V 2000 M91, and this is the number on the old injector.”
The second enquiry gives you something you can actually work with.
The same applies to Series 4000 engines.
A listing that simply says:
“MTU 4000 injector”
should make you ask one more question:
Which MTU 4000?
What is the best way to search for an MTU injector?
If you already have the number, keep it simple.
Search for:
MTU + injector part number
Then add the engine model.
For example:
MTU 16V 2000 M91 + injector number
or:
MTU 12V 4000 M90 + injector number
That is much more useful than just typing:
MTU fuel injector
The more specific your search is, the less time you spend looking at the wrong parts.
What if the injector number is difficult to read?
Don’t guess.
That’s probably one of the easiest ways to end up with the wrong injector.
If you can see most of the number but one digit is unclear, don’t decide what it “probably” is.
Take close-up photographs.
Take another picture in better light.
Photograph the complete injector as well, not only the number.
It also helps to include the engine data plate.
If the number still cannot be read, the engine model, serial number and clear photographs at least give you something solid to work from.
Can two MTU injectors look the same and still be different?
Yes.
That’s why appearance alone is a poor way to identify them.
Two injectors may have a similar body shape, similar electrical connection and similar fuel connections and still not be the same injector.
Even similar-looking part numbers do not automatically mean the parts are interchangeable.
This is one of those cases where the numbers matter more than the photograph.
The photograph helps.
The part number confirms.
I found another injector number online. Is it a replacement?
Maybe.
It could be a genuine supersession.
It could be an exchange reference.
It could be a remanufactured number.
Or it could simply be a cross-reference created by a seller.
Those are not all the same thing.
If you have an old injector number and you find a newer number online, keep both.
Then check them together with the full engine model and serial number before buying.
A useful enquiry would look like this:
Old injector number:
XXXXXXXX
Proposed replacement number:
XXXXXXXX
Engine model:
MTU XXXXX
Engine serial number:
XXXXXXXX
That is much easier to verify than just asking:
“Is this number the same?”
What is the difference between a superseded injector and a cross-reference?
A superseded number usually means the original reference has been replaced by another established reference.
A cross-reference may simply mean a seller or database believes two parts correspond.
Cross-references can be useful, but they should not automatically be treated as proof.
That distinction matters.
If you’re buying an expensive injector set for a large MTU engine, you want to know whether the replacement relationship is documented or just repeated across online listings.
What if the injector is old and the number no longer appears online?
Keep the number anyway.
Old references can still be extremely useful.
An older injector may have been replaced by another number over time, or there may be an exchange or remanufactured reference connected to it.
The original number helps build that trail.
So if you remove an injector from an older MTU engine, photograph the number before sending it away or putting it into storage.
Old numbers are not useless numbers.
Does the engine serial number really matter?
Yes, but I would not rely on the serial number alone if the injector number is available.
Think of it as another piece of the identification puzzle.
The best combination is:
Full engine model + engine serial number + existing injector part number
If you have all three, use all three.
There is no advantage in leaving useful information out of the enquiry.
Are all MTU Series 2000 injectors interchangeable?
No.
An injector used on one Series 2000 engine should not automatically be treated as correct for another Series 2000 engine.
The same rule applies to the Series 4000.
Engine family alone is not enough.
This is why generic descriptions like:
“Fits MTU 2000”
or:
“Fits MTU 4000”
need to be checked carefully before you rely on them.
What Are Some Actual MTU Series 2000 Injector Part Numbers?
This is where having the exact engine model starts to make a real difference.
If someone asks for an “MTU Series 2000 injector,” that still leaves a lot of room for error. Series 2000 covers different engines and configurations, and they don't all use the same injector.
For example, MTU parts documentation for the 16V2000 M91 identifies:
MTU 0010104851 — Fuel Injector
An exchange reference is also documented:
MTU E0010104851 — Exchange Fuel Injector
The documented 16V2000 M91 application uses 16 injectors.
So if you've removed an injector from a 16V2000 M91 and found 0010104851 on it, that's a much better starting point than simply searching for an “MTU 2000 injector.”
But here's where it gets interesting.
Another engine from the same 16V2000 family uses a different documented injector reference.
What Injector Is Used on the MTU 16V2000 M94?
For the MTU 16V2000 M94, parts documentation identifies:
MTU X51107500005 — Fuel Injector
Again, the documented engine uses 16 injectors.
So now we have two 16V2000 examples:
MTU 16V2000 M91 → 0010104851
MTU 16V2000 M94 → X51107500005
That's exactly why I wouldn't order an injector based only on a description like:
“Fits MTU 16V2000.”
Which 16V2000?
An M91 and an M94 are both part of the Series 2000 family, but the documented injector references above are different.
If you know the complete engine model, use it.
If you also have the serial number and the number from the old injector, even better.
What About MTU Series 4000 Injector Part Numbers?
The same rule applies to the Series 4000.
There isn't one part number that you can simply call:
“the MTU Series 4000 injector.”
One Series 4000 injector reference you may encounter is:
MTU X52407500021 — Fuel Injector
This is a Series 4000 fuel-injector reference, but the exact engine application should still be verified before ordering.
Another important reference is:
MTU X59407500020 — Fuel Injector
You may also encounter the exchange/remanufactured reference:
MTU EX59407500020
The X59407500020 injector is associated with selected MTU Series 4000 applications. Available application information includes selected 12V4000 G23 and 12V4000 G23R engines.
Again, the number is useful because it gives you something specific to work with.
If X59407500020 is the number on your existing injector, start there.
Don't start with another Series 4000 injector simply because it looks similar.
Can I Use X52407500021 Instead of X59407500020?
Don't assume that you can.
This is probably one of the most important points in the whole article.
Both numbers can appear when you're searching for MTU Series 4000 fuel injectors, but that does not mean one automatically replaces the other.
A list of injector part numbers is useful for identification.
It isn't automatically a list of interchangeable parts.
If your old injector says:
X52407500021
start with X52407500021.
If it says:
X59407500020
start with X59407500020.
If a supplier proposes another injector number, ask how that number relates to the injector currently installed in your engine.
It could be a superseded reference, an exchange reference or a part intended for a different engine configuration.
That's worth checking before you spend the money.
What Does E or EX Mean on an MTU Injector Number?
You'll sometimes see additional letters in an injector reference.
For example, with the documented 16V2000 M91 references you have:
0010104851
and:
E0010104851
And with the Series 4000 injector discussed above, you may encounter:
X59407500020
and:
EX59407500020
The additional reference can be associated with an exchange or remanufactured version.
The important thing is to copy the complete number exactly as you find it.
If your documentation says:
E0010104851
don't send only:
0010104851
And if the injector or quotation says:
EX59407500020
don't shorten it to:
X59407500020
Send the complete reference and let the supplier know exactly what you have.
MTU Injector Part Numbers at a Glance
Here are some of the Series 2000 and Series 4000 injector references discussed in this guide:
| MTU Part NumberDescriptionApplication Information | ||
| 0010104851 | Fuel injector | MTU 16V2000 M91 |
| E0010104851 | Exchange fuel injector | MTU 16V2000 M91 |
| X51107500005 | Fuel injector | MTU 16V2000 M94 |
| X52407500021 | Fuel injector reference | MTU Series 4000 — verify exact engine |
| X59407500020 | Fuel injector | Selected MTU Series 4000 applications |
| EX59407500020 | Exchange/remanufactured injector | Associated with X59407500020 |
This table is here to help with identification and part-number searches.
It is not an interchangeability table.
We're not saying:
0010104851 = X51107500005
and we're not saying:
X52407500021 = X59407500020
They are different references.
The reason they're included is to show why knowing the exact injector number matters.
Why Isn't “MTU 16V2000 Injector” Enough?
Look at the two Series 2000 examples again:
16V2000 M91 → 0010104851
16V2000 M94 → X51107500005
Both engines are 16V2000s.
But the documented injector references are different.
That's why the little bit after “16V2000” matters.
M91, M94 and other Series 2000 variants shouldn't be treated as though they're all the same engine when you're buying fuel-system parts.
The same principle applies to Series 4000 engines.
A search for:
“MTU 4000 injector”
might help you find suppliers.
It doesn't tell you which injector belongs in your engine.
Can Two MTU Injectors Look Almost Identical?
Yes, and that's where people can get caught out.
Two injectors can look very similar in photographs. The body, connections and overall size may appear almost identical.
That still doesn't prove they're interchangeable.
When you've got the old injector in front of you, the number stamped or marked on it is far more useful than trying to match photographs online.
Use the photograph as supporting information.
Use the part number for identification.
What If the Number on My Old Injector Is Different?
That's completely possible.
The numbers in this article are examples. They are not meant to be a complete MTU injector catalogue.
There are many Series 2000 and Series 4000 engine configurations.
If the number on your injector isn't shown here, don't try to make one of these numbers fit your engine.
Use the number you actually have.
That's the important one.
If the number is difficult to read, take several close-up photographs in good light.
Don't guess a missing digit.
One wrong number can send the whole search in the wrong direction.
What If I Find an Old Number and a New Number?
Keep both.
You may find that the injector removed from the engine carries one reference while a supplier offers another.
That doesn't automatically mean the proposed injector is wrong.
There may be a supersession, exchange or remanufactured reference involved.
But it should be checked.
For example, send:
Engine model: MTU 16V2000 M91
Engine serial number: XXXXXXXX
Existing injector: 0010104851
Proposed replacement: XXXXXXXX
Then ask the supplier to confirm the relationship between the two numbers.
That's much safer than ordering because an online listing says:
“Replaces MTU injector.”
What Should I Send When I Need an MTU Injector?
You don't need to write a long email.
Just give the supplier the information that actually helps identify the part.
Ideally, send:
Complete MTU engine model
Engine serial number
Existing injector part number
Any replacement or exchange number you already have
Quantity required
Condition required
Photographs if available
Delivery destination
A real enquiry might look like this:
Engine: MTU 16V2000 M91
Engine serial number: XXXXXXXX
Existing injector: 0010104851
Quantity: 16
Condition: Please advise available options
Delivery: Rotterdam, Netherlands
Or:
Engine: MTU 16V2000 M94
Engine serial number: XXXXXXXX
Existing injector: X51107500005
Quantity: 16
Delivery: Miami, USA
For a Series 4000 engine:
Engine: Complete MTU Series 4000 model
Engine serial number: XXXXXXXX
Existing injector: X59407500020
Quantity: XX
Delivery: [destination]
That's something a parts supplier can actually work with.
Compare that with:
“Hello, please quote MTU 2000 injectors.”
The second enquiry usually leads straight to another email asking for the engine model and part number.
You can save that time by sending the information from the beginning.
Before You Order an MTU Injector
If there's one thing to take from this guide, it's this:
Don't buy an injector because it looks right.
Don't buy it because the listing says “MTU Series 2000.”
And don't buy it because it says “MTU Series 4000.”
Start with what's actually fitted to the engine.
Check the complete engine designation.
Record the serial number.
Copy the injector number exactly.
Engine model + serial number + existing injector number + quantity + delivery destination
That gives us something solid to work from.
Can I buy a new injector instead of OEM?
You can sometimes have different supply options, but the wording matters.
If you specifically need an OEM injector, say:
OEM required
Don’t just say:
New injector required
A part can be brand new without being OEM.
Before ordering, make sure you know what condition and manufacturer you are actually being offered.
What about reconditioned MTU injectors?
They can be an option in some cases.
But “reconditioned” is a broad term.
One supplier’s reconditioned injector may have had a very different level of work from another supplier’s.
If you are considering reconditioned injectors, ask what condition they are in and what work has been carried out.
The label alone doesn’t tell you everything.
Can MTU injectors have exchange or remanufactured references?
Yes.
An injector that comes through an exchange or remanufacturing program may have a different reference from the injector originally removed from the engine.
If you have both references, keep both.
That information is useful.
For example:
Original injector reference
Exchange or remanufactured reference
Engine model
Engine serial number
Quantity required
That gives you a much better parts trail.
My MTU engine is smoking. Does that mean the injectors are bad?
Not automatically.
This is where it’s important not to turn every engine symptom into an injector order.
Smoke, poor combustion or power loss can come from more than one cause.
Depending on the engine, you may also need to consider:
Fuel quality
Fuel supply
Filters
Fuel pressure
Air supply
Compression
Electrical control
Individual cylinder condition
and, of course,
Injector condition
The injectors may be involved.
But the symptom alone doesn’t prove it.
What if only one cylinder seems different?
That gives you something more useful to investigate.
If one cylinder is behaving differently from the rest, you can start comparing that cylinder with the others instead of replacing parts across the whole engine immediately.
Depending on the engine and the available diagnostic information, that may include looking at cylinder behaviour, temperature, combustion condition, injector performance or compression.
The point is simple:
Find the problem before you buy the parts.
Should I replace one injector or the whole set?
There isn’t one answer for every engine.
If one injector has a confirmed problem, the next step depends on the operating hours, maintenance history, overall engine condition and the reason the injector failed.
During a major overhaul, it may make sense to inspect or service a complete set.
During a smaller repair, one confirmed injector may be the only part that needs attention.
The decision should come from the engine condition, not from a blanket rule.
What should I do with the injectors during an overhaul?
Keep them organized.
This sounds basic, but it matters a lot on a 12- or 16-cylinder engine.
Before the injectors are mixed together, record:
Cylinder position
Injector number
Condition
If they are going out for service, photograph them first.
Then when they come back, you have a record of what was removed and what was returned.
It saves confusion later.
I don’t have the injector number at all. What should I send?
Send what you do have.
A useful enquiry would include:
Complete MTU engine model
Engine serial number
Photographs of the injector
All visible markings
Quantity required
Required condition
Delivery destination
That is far more useful than:
“Need MTU injectors. Please quote.”
The more information you send at the beginning, the less guessing is involved later.
What are the most common mistakes when ordering MTU injectors?
The biggest one is being too general.
“MTU 4000 injector” is not enough.
Another common mistake is ordering by appearance.
Then there is guessing an unreadable number, dropping leading zeroes, assuming every cross-reference is correct or assuming a new part must be OEM.
All of those problems come back to the same thing:
Identify first. Order second.
What should I check before I place the order?
Before you buy, compare the basics one more time:
Engine model
Engine serial number
Existing injector number
Proposed replacement number
Condition
Quantity
If a number has changed, establish why.
If a cross-reference is being used, check it.
If OEM is required, say so.
If the injector number is unreadable, send photographs instead of guessing.
A few minutes spent checking the information can prevent a very expensive return.
Do you supply MTU Series 2000 injectors?
Depending on the exact requirement and availability, Series 2000 injectors and related fuel-system components can be sourced.
But when you ask for a quote, send the full engine designation.
For example:
MTU 16V 2000 M91
is much better than simply:
MTU Series 2000
You can also browse our marine spare-parts catalog if you already know the part or component you need.
Do you supply MTU Series 4000 injectors?
Depending on the individual engine and availability, Series 4000 fuel-system components can also be sourced.
Again, identify the complete engine.
For example:
MTU 12V 4000 M90
is much more useful than:
MTU 4000
Then add the injector number and serial number.
That is the information that matters.
Frequently Asked Questions About MTU Fuel Injectors
How do I find my MTU fuel injector part number?
Look at the injector already fitted to the engine and copy the complete reference exactly as shown. Combine that number with the full engine model and serial number.
Can I search by injector part number?
Yes. Search the complete injector number together with MTU and, ideally, the exact engine model.
Is the engine serial number enough?
It helps, but if the existing injector number is available, include that too.
Are all MTU Series 2000 injectors the same?
No. Series 2000 includes different engine models and configurations.
Are all MTU Series 4000 injectors the same?
No. The full engine designation and injector number should be checked.
Can an old injector number have a newer replacement?
Yes. Injector references can be superseded or linked to exchange and remanufactured numbers. Keep the old number and verify the replacement before ordering.
Can I identify an injector from a photograph?
Photographs can help a lot, especially when the number is damaged or unreadable, but they are best used together with the engine model and serial number.
Does a similar-looking injector fit?
Not necessarily.
Does black smoke mean bad injectors?
Not always. Black smoke can have several causes, so diagnose the engine before replacing injectors unnecessarily.
Can I buy reconditioned injectors?
Depending on the application and availability, yes. Make sure you understand the condition and what reconditioning work was carried out.
Should I keep injector records during overhaul?
Yes. Record the cylinder position, injector number and condition before the injectors are mixed or sent for service.
Looking for an MTU Fuel Injector?
If you need an MTU fuel injector, the best thing you can send is:
Complete MTU engine model
Engine serial number
Existing injector part number
Quantity
Required condition
Photographs if available
Delivery destination
If the injector number is difficult to read, don’t guess.
Send photographs.
You can browse our marine spare-parts catalog or request a quotation.
Email: request@alfamarinespareparts.com
An old injector number may look insignificant, but it can be exactly what is needed to find the correct replacement.
Independent Supplier Notice
Alfa Marine Spare Parts is an independent supplier and is not an official or authorized dealer of MTU or Rolls-Royce Power Systems. Brand names, trademarks, part numbers and model designations are used for identification and compatibility-reference purposes only.