Caterpillar C9 Marine Fuel Injectors: Part Numbers, Reman & Bad Injector Symptoms
“I need six injectors for a Caterpillar C9. Can you quote them?”
Yes — but before we quote anything, there is one question worth answering:
Which injectors are actually fitted to your C9?
It sounds simple, but this is where many injector enquiries become more complicated than expected.
You might have an old service report showing 241-9595, while the injector removed from the engine carries 20R-8068.
Another C9 might have 293-4073 in its maintenance records, while somebody searching for replacements keeps finding 20R-8065.
That doesn't automatically mean somebody previously installed the wrong injector.
During the life of a Caterpillar C9, you can come across original part numbers, later references and Cat Reman numbers.
Some C9 marine injector references you may encounter include:
241-9595 / 2419595 → 20R-8068 / 20R8068 Reman
236-0957 / 2360957 → 10R-9002 / 10R9002 Reman
293-4073 / 2934073 → 20R-8065 / 20R8065 Reman
328-2576 / 3282576 → 20R-8065 / 20R8065 Reman
573-4231 / 5734231 → 20R-8846 / 20R8846 Reman
If the injectors are already out of the engine, take a photograph of the numbers before they disappear into a workshop box.
Then combine that information with the C9 engine serial number and arrangement number.
That gives us a much better starting point than simply receiving an email saying:
“Need six CAT C9 injectors.”
For other components, browse our Caterpillar C9 Marine Engine Parts.
If you already have the injector number, you can also send us your Caterpillar C9 injector enquiry.
Which Fuel Injector Fits My Caterpillar C9 Marine Engine?
There isn't one injector number that should automatically be ordered for every Caterpillar C9.
Different engine configurations and previous repairs mean several references can appear during the life of the engine.
| Injector Part NumberSearch Without HyphenRelated Cat Reman Reference | ||
| 241-9595 | 2419595 | 20R-8068 / 20R8068 |
| 236-0957 | 2360957 | 10R-9002 / 10R9002 |
| 293-4073 | 2934073 | 20R-8065 / 20R8065 |
| 328-2576 | 3282576 | 20R-8065 / 20R8065 |
| 573-4231 | 5734231 | 20R-8846 / 20R8846 |
This is why the question:
“What injector fits a CAT C9?”
doesn't always have a useful one-number answer.
We'd rather know what is physically installed on your engine.
“My Injector Says 20R-8068, but My Records Say 241-9595”
That's not necessarily a problem.
For the applicable C9 configuration:
241-9595 / 2419595
is associated with:
20R-8068 / 20R8068 Reman
The engine may simply have received Reman injectors during an earlier repair.
Maybe that happened five years ago.
Maybe the engineer who did the job is no longer with the vessel.
Maybe all you have now is an old invoice and the number stamped on the injector.
That's okay.
Send us both.
The more identification information we have, the easier it is to establish what you're actually working with.
Request a Quote for 241-9595 / 20R-8068
“I Found 236-0957 on the Injector”
Good. Keep that number.
236-0957 / 2360957 is another Caterpillar fuel injector reference listed in our catalogue.
For applicable C9 configurations, the associated Cat Reman reference is:
10R-9002 / 10R9002
This is exactly why we tell engineers not to throw the old injector into the exchange box before recording its number.
If 2360957 is what you can read on the injector, send us 2360957.
You don't need to worry about adding the Caterpillar-style hyphen.
View Caterpillar 236-0957 / 2360957 Fuel Injector
“My C9 Has 293-4073 Injectors. What Replaces Them?”
Another injector already listed in our catalogue is:
For applicable C9 configurations, this number is associated with:
20R-8065 / 20R8065 Reman
But here's where Caterpillar part-number research becomes interesting.
You can also encounter:
328-2576 / 3282576
associated with 20R-8065 / 20R8065.
That is a useful reminder that replacement histories aren't always as simple as:
one old number = one new number forever.
If you're looking at 293-4073 on the injector, start there.
Don't change the number yourself because another C9 injector appears in a search result.
View Caterpillar 293-4073 / 2934073 Fuel Injector
“What About 328-2576?”
You may also encounter:
328-2576 / 3282576
with:
20R-8065 / 20R8065 Reman
If 3282576 is the number on your existing injector or parts record, include it in the enquiry.
If you also have 20R8065 in an old invoice or maintenance report, include that too.
Don't worry about deciding which number is the “correct” one before contacting us.
That's what the identification process is for.
Caterpillar C9 Fuel Injector 573-4231 / 5734231
Another C9 injector reference is already listed directly in the Alfa Marine catalogue:
573-4231 / 5734231 Caterpillar Engine Fuel Injector
The related Cat Reman reference for applicable configurations is:
20R-8846 / 20R8846
So perhaps the engineer sends you a photo showing:
573-4231
but purchasing finds:
20R-8846
while looking for a replacement.
Don't discard either number.
Keep them together with the engine information.
View Caterpillar 573-4231 / 5734231 Fuel Injector
How Do I Know if My Caterpillar C9 Has a Bad Injector?
This is where we move away from part numbers.
An injector doesn't always fail dramatically.
Sometimes the engine still starts.
It still reaches operating temperature.
The vessel still leaves the berth.
But the engineer who hears that C9 every day notices:
“Something has changed.”
Maybe the idle isn't quite as clean.
Maybe there's more smoke than before.
Maybe the engine feels different when the throttles come forward.
Perhaps one cylinder doesn't seem to be contributing like the others.
Possible signs worth investigating include:
- Rough or uneven running
- Hard starting
- Increased exhaust smoke
- Poor acceleration
- Reduced power
- Increased fuel consumption
- Misfire
- Uneven cylinder contribution
- Abnormal exhaust-temperature differences
- Relevant engine fault information
But none of these automatically proves that an injector has failed.
That's where diagnosis matters.
“My Caterpillar C9 Is Blowing Black Smoke. Is It an Injector?”
Possibly.
But we'd want to know more.
When does it smoke?
Only when accelerating?
At cruising RPM?
At full load?
Does the smoke disappear once the engine settles?
Has power also dropped?
What is happening with boost?
Black smoke puts the relationship between fuel and available combustion air under investigation.
An injector delivering fuel incorrectly can contribute.
But so can:
- Restricted air intake
- Charge-air leak
- Damaged or loose hose
- Fouled aftercooler
- Turbocharger problem
- Excessive engine load
So don't jump directly from:
“My C9 has black smoke.”
to:
“I need six injectors.”
The injectors may need attention.
But the engine deserves a proper diagnosis first.
“What If the C9 Has White Smoke?”
White smoke is another clue.
It still isn't an injector part number.
Ask:
Does it happen only when the engine is cold?
Does it disappear after warming up?
Is one cylinder behaving differently?
Does it continue under load?
An injector may be involved, but compression, temperature and general cylinder condition can also affect combustion.
A C9 that produces smoke briefly after a cold start isn't necessarily telling you the same thing as an engine producing continuous white smoke at operating temperature.
The circumstances matter.
“It Runs Rough When Cold, Then Becomes Smooth”
Write that down.
That small detail is useful.
Compare these two fault descriptions:
“C9 runs rough.”
and:
“C9 runs rough for the first five minutes after a cold start, then becomes smooth at operating temperature.”
The second tells a technician considerably more.
If a symptom changes with temperature, RPM or load, mention it.
Patterns help diagnose engines.
Should I Replace One C9 Injector or All Six?
We get this question regularly.
There isn't one answer for every C9.
Imagine one injector has clearly failed.
The other five were replaced recently and are performing correctly.
Would replacing all six automatically make sense?
Not necessarily.
Now imagine another C9.
All six injectors have accumulated high operating hours.
One has failed.
Another cylinder is already beginning to behave differently.
The vessel is in the shipyard and the engine is open.
That's a different decision.
Consider:
- Engine operating hours
- Injector operating hours
- Maintenance history
- Test results
- Reason for failure
- Condition of the remaining injectors
- Vessel operating schedule
- Labor involved
- Cost of another shutdown
For commercial vessels, downtime is part of the repair cost.
But one failed injector does not automatically mean six failed injectors.
Can I Mix New and Reman C9 Injectors?
The first concern should be whether every injector is correct for the actual engine configuration.
Don't start mixing C9 part numbers simply because every online listing says:
“Fits CAT C9.”
If the engine already has Reman injectors, record their numbers.
If five injectors carry one reference and the sixth carries another, photograph everything before installation or removal.
There may be a perfectly reasonable explanation.
Or there may be something worth investigating.
Either way, the numbers give us something useful to work with.
Remember That the Caterpillar C9 Uses HEUI Injection
This is particularly important when diagnosing injector-related complaints.
The C9 uses a HEUI-type injection system, where high-pressure engine oil is involved in injector actuation.
Imagine several cylinders suddenly start behaving badly.
Did several injectors fail simultaneously?
Maybe.
But that's not the only possibility.
The hydraulic actuation side of the HEUI system also needs to be considered.
If injector-actuation pressure isn't correct, engine performance can be affected without the injectors themselves necessarily being the original cause.
That's why a C9 injector diagnosis shouldn't happen completely separately from the rest of the injection system.
Browse our Caterpillar C9 Marine Engine Parts for other C9 fuel-system and engine components.
“We Changed the Injector, but the Misfire Is Still There”
That's frustrating.
But it's also useful information.
If the correct injector was fitted correctly and the same cylinder still isn't contributing normally, go back to the diagnosis.
That cylinder also depends on:
- Compression
- Valve condition
- Electrical control
- Wiring
- HEUI operation
- Mechanical condition
A new injector won't repair poor compression.
Another injector won't repair damaged wiring.
If replacing the component didn't change the symptom, reconsider what the engine is telling you.
Before Those Six Injectors Leave the Engine Room
Take photographs.
Not just one photograph of six dirty injectors lying together.
Get a clear picture of the identification number on each one.
If possible, record which cylinder each injector came from.
For example:
Cylinder 1 — 20R-8068
Cylinder 2 — 20R-8068
Cylinder 3 — 20R-8068
Cylinder 4 — 20R-8068
Cylinder 5 — 20R-8068
Cylinder 6 — 20R-8068
Now imagine cylinder four has a completely different reference.
You've spotted it before everything gets mixed together.
Also photograph the engine identification plate.
Five minutes with a phone can save hours of parts-identification work later.
“I Only Have the Injector Number. Can You Help?”
Yes.
Send the number exactly as you have it.
If the injector says:
2360957
send 2360957.
If it says:
2934073
send 2934073.
If it says:
5734231
send 5734231.
You don't need to work out where Caterpillar puts the hyphen.
If you have an old number and a Reman number, send both.
For final identification, we would also like:
Engine serial number
Serial-number prefix
Arrangement number
Quantity
Delivery destination
If the number is difficult to read, send a clear photograph.
Send Your Caterpillar C9 Injector Enquiry
Don't Accidentally Order C9.3 Injectors
This deserves its own warning because the names look very similar.
and:
Caterpillar C9.3
are different engine platforms.
Don't assume a C9.3 injector is simply a newer version of a C9 injector.
Look at the engine identification plate.
If it says:
C9
identify parts against the C9.
If it says:
C9.3
identify parts against the C9.3.
That decimal point matters when you're ordering engine components.
Caterpillar C9 Injector Part Numbers at a Glance
241-9595 / 2419595
Related Cat Reman reference:
20R-8068 / 20R8068
236-0957 / 2360957
Related Cat Reman reference:
10R-9002 / 10R9002
View 236-0957 / 2360957 Caterpillar Fuel Injector
293-4073 / 2934073
Related Cat Reman reference:
20R-8065 / 20R8065
View 293-4073 / 2934073 Caterpillar Fuel Injector
328-2576 / 3282576
Associated Reman reference:
20R-8065 / 20R8065
573-4231 / 5734231
Related Cat Reman reference:
20R-8846 / 20R8846
View 573-4231 / 5734231 Caterpillar Fuel Injector
Need Caterpillar C9 Marine Fuel Injectors?
If you're looking for:
241-9595 / 2419595
20R-8068 / 20R8068
10R-9002 / 10R9002
20R-8065 / 20R8065
328-2576 / 3282576
or:
20R-8846 / 20R8846
send us the number you actually have.
You don't need to work out the complete replacement history yourself.
For the quickest identification, include:
Engine model + Serial number + Arrangement number + Existing injector number + Quantity + Delivery destination
Request a Caterpillar C9 Injector Quote
or email:
request@alfamarinespareparts.com
For other C9 components:
Caterpillar C9 Marine Engine Parts
For the wider Caterpillar range:
Caterpillar Marine Engine Parts & Rebuild Kits
Or browse: