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Warranty & delivery
Standard 12‑month Dieselink limited warranty; in‑stock injectors normally ship within a few working days. Export lead times may vary by region – see current sales terms for full details.
DIESELINK XPI SERIES • BRAND NEW
IN STOCKCummins 5491515 XPI Fuel Injector – ISG / QSG 12L (Euro 5, industrial)
CUMMINS PART NUMBER
5491515
Key specifications
- System type
- Cummins XPI extra-high-pressure common-rail
- Engine application
- Cummins ISG / QSG 12L XPI (Euro 5, industrial) – confirm by ESN/CPL.EPA07 on-highway – confirm by ESN / CPL.
- Calibration
- Individual Dieselink XPI trim code suppliedECM trim-code programming required per cylinder.
- Core components
- Brand-new Dieselink XPI injector assemblyOEM-spec XPI nozzle, control valve and solenoid.
Trim code ready
Unique Dieselink XPI trim code from multi-point bench-test data.
Bench-tested
Flow, leakage and key XPI points verified on a dedicated high-pressure test stand.
Supplied as a new Dieselink XPI injector with a valid trim code and test data; once correctly programmed, your ISG / QSG 12L engine typically stays within OEM fuel-balance, emissions and noise limits.
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Specifications
System & Platform
System type
Cummins XPI extra-high-pressure common-rail fuel system
Injector type
Solenoid-actuated XPI common-rail injector
Engine series
ISG / QSG 12L series
Emission programme
Euro 5
Nozzle & Pressure
Nozzle configuration
8-hole VCO nozzle (approx. 0.18 mm)
Rail pressure capability
Up to approximately 2,500 bar (XPI system capability; actual commanded pressure depends on ECM calibration and duty cycle).
Electrical connector
2-pin solenoid connector, Cummins XPI style
Calibration & Build
Calibration & trim code
Individual Dieselink XPI trim code supplied; ECM trim-code programming required for each cylinder at installation.
Core components (new)
Brand-new Dieselink injector assembly with OEM-spec XPI nozzle, control valve and solenoid.
Fuel, Cleanliness & Testing
Recommended fuel & filtration
Ultra-low sulfur diesel (ULSD) meeting local specification; high-efficiency filtration designed for modern XPI / high-pressure common-rail systems.
Cleanliness sensitivity
XPI internals are highly sensitive to fine particulate contamination – follow Cummins-style fuel-system and assembly cleanliness practices.
Testing expectation
100% bench-tested on an XPI-capable test stand for leakage, pilot / main flow and dynamic response across multiple load points.
Direct part number
5491515
Cross-reference
5491515, 5491515PX, 4307475, 4307475RX
Injector kits
Kit options vary by service number for injector 5491515 (contents depend on application).
Engine platforms
Commonly catalogued with ISG / QSG / X12 XPI platforms.
Vehicle applications
Export-market heavy-duty trucks, buses and coaches, and related industrial installations using QSG12 platforms
Off-highway use
Cummins QSG off-highway variants (Tier 3)
Replacement sets
5491515PX – replacement set option (configuration varies by application).
Product Details
In-depth technical information, applications, Dieselink testing methods and support resources
Dieselink OEM-Grade Cummins / Scania XPI Fuel Injector
Tier-1 aftermarket, new-production, no-core replacement
The Dieselink OEM-grade aftermarket XPI fuel injector is engineered for Cummins and selected Scania heavy-duty diesel engines running the Xtra-High Pressure Injection (XPI) common-rail system. It is validated to deliver OE-level performance, fuel economy and durability at a more competitive total cost than dealer injectors, without the risks associated with small-shop rebuilds or untraceable "white-box" copies.
Key Benefits at a Glance
Tier-1 manufacturing pedigree
Dieselink XPI injectors are built in an OEM-grade facility with Tier-1 programme experience for leading global engine manufacturers, using OE-specification drawings, controlled machining processes and scheduled quality audits.
Brand-new units, no core charge
New-production Dieselink XPI injectors (not remanufactured); no core returns, no "bad core" disputes and simpler e-commerce and export logistics.
Genuine-spec core components
Nozzle, valve assembly, needle and solenoid are manufactured to Cummins XPI specification using matched materials and geometries, not reverse-engineered from worn cores.
Designed for extra-high-pressure XPI systems
Validated for rail pressures up to approximately 2,500 bar with pilot, main and post-injection events controlled by the OE ECU on modern heavy-duty diesel engines.
Real encrypted trim code per injector
Each Dieselink injector runs on an XPI-specific performance test plan; a unique encrypted trim code is calculated from real bench data and laser-marked on the injector body for ECM calibration.
Cleanroom assembly to CES 16599
Multi-stage ultrasonic cleaning and dust-controlled assembly, with fuel-system cleanliness monitored against Cummins CES 16599 guidelines before injectors are released.
Proven by a 1,000-hour engine durability test
Durability screening on rigs plus a 1,000-hour, ~110%-load engine durability test on heavy-duty XPI platforms at a North American OEM engine test center form part of the validation history.
QR-based traceability & documentation
Every Dieselink XPI injector carries a serial number, trim code and QR code; scanning provides access to original test data and associated quality records.
For workshops, distributors and fleets, this means you can fit a Dieselink Cummins / Scania XPI injector that behaves like OE in the engine, with straightforward purchasing and a lower total cost of ownership over the life of the part.
Who It's For
Workshops & Repair Shops
- ✓Fewer comebacks:Correct hydraulic performance, CES 16599-level cleanliness and genuine encrypted trim codes reduce knock, smoke and injector-related fault codes after repair.
- ✓Easier diagnostics:Optional Dieselink bench-test reports and clear trim-code instructions help technicians verify injector performance and rule components in or out quickly.
- ✓Lower liability on parts:New-production, OE-style Dieselink XPI injectors reduce the risk of warranty labour caused by unknown rebuilders or mixed-quality parts.
Distributors & Wholesalers
- ✓Defensible quality story:You are supplying XPI injectors from an OEM-grade Tier-1-style production environment with documented process control and validation, not from an unknown small workshop.
- ✓Lower claim rates:Consistent Dieselink manufacturing and OEM-style validation reduce early failures and the cost of handling complaints.
- ✓No-core commercial model:Brand-new injectors with no core charge simplify logistics, pricing and cross-border movements for global customers.
Fleets & End Users
- ✓Predictable engine behavior:Engines start cleanly, idle smoothly and pull under load without hesitation, knock or excessive smoke when each cylinder is correctly coded.
- ✓Lower lifecycle cost:OE-level XPI injector performance at a lower price point than dealer parts, helping avoid downtime and fuel penalties from poor-quality rebuilds.
- ✓Better uptime:Dieselink injectors are validated for long-haul trucking, construction and mining duty cycles where injector reliability directly affects availability.
Applications & Fitment
This Dieselink XPI injector range is intended for Cummins XPI and selected Scania XPI engines used in heavy-duty on-road and off-highway applications. Always confirm fitment by OEM part number, engine model and/or VIN (and ESN / CPL where available) before ordering.
Engine Families
Cummins XPI Heavy-Duty Engines
| ISX / ISX15 / X15 | Class-8 and heavy-duty trucks, tractors and vocational platforms |
| ISG derivatives | Regional trucks, buses and industrial equipment |
Scania XPI Engines
| DC13-series | Long-haul trucks, buses and coaches using Scania XPI fuel systems |
Typical Vehicles & Equipment
- Long-haul and regional-haul highway tractors
- City buses and intercity coaches
- Construction and mining trucks
- Industrial and power-generation sets (gensets)
Duty Cycles & Environments
- High-load, high-mileage routes at cruise torque
- Urban stop-start with extended idling
- Hot, dusty environments
- Markets with strict emission regulations (e.g. EPA07 / Euro IV and newer)
Technical Highlights
System Performance
| Injection system | Cummins / Scania XPI extra-high-pressure common-rail |
| Maximum rail pressure | Up to approx. 2,500 bar |
| Injection strategy | Pilot, main and post injection events |
| Fuel compatibility | Diesel fuels meeting EN / ASTM (ULSD) |
Hydraulic Design & Flow Control
| Adjustment concept | 2-shim XPI design (tight dimensional window) |
| Natural flow scatter | Up to ±20% at high-load (corrected via trim code) |
| Nozzle manufacturing | Micro-hole EDM + extrude-honing |
| Critical clearances | High-precision grinding, 100% measurement |
Electrical Characteristics
| Actuation | High-speed solenoid, XPI connector |
| Control | OEM XPI ECM with specific current ramp |
| Verification | Solenoid performance verified before bench testing |
Packaging & Traceability
| Packaging | Export-grade with protective caps |
| Test report | Print or digital per unit from bench data |
| Trim code | Unique encrypted code laser-marked on body |
| Traceability | QR code links to quality database |
Manufacturing & Process Control
This is not a repair-shop rebuild. Dieselink XPI injectors are produced in an OEM-grade manufacturing plant in China, with engineering and quality systems aligned to the requirements of major global heavy-duty engine manufacturers.
- Joint engineering drawings:Created by the Dieselink injector engineering team to match Cummins XPI system requirements, then released as controlled drawings for series production.
- Standard Work & control plans:Every process step is defined by Standard Work Instructions and Control Plans, supported by FMEA, MSA, SPC and APQP-style reviews.
- High-precision machining:Nozzles, needles and valve components are machined using high-end grinding, EDM and lapping equipment to maintain tight hydraulic tolerances.
- Cleanroom assembly & CES 16599:Critical parts pass through multi-stage ultrasonic cleaning into a dust-controlled assembly workshop, with cleanliness levels checked against CES 16599 fuel-system limits.
- Intelligent assembly system:An intelligent assembly system scans the injector body, retrieves dimensional data from the database and calculates shim grades to achieve micrometre-level control of lift and preload.
- Database & QR-based traceability:Dimensional data, cleanliness results, bench-test values and trim codes are stored in the Dieselink quality database and linked to the injector's QR code.
Reliability & Validation Testing
XPI injectors are significantly more demanding to design and validate than conventional common-rail injectors. Dieselink XPI units follow a structured validation path similar to OE programmes.
- Component verification:Critical dimensions on nozzles, needles, valve assemblies and solenoids are measured with high-precision gauges and CMM / vision systems.
- Performance & leakage tests:Every injector runs through a full XPI performance test plan with multiple pressure, speed and load points to confirm commanded flow and leakage.
- Response & transparency checks:Dynamic response and control behavior are evaluated across the load and speed range to ensure the ECU can control pilot, main and post injections accurately.
- Durability screening:New designs are screened through 500-hour rig and "drag" durability tests to expose wear-out and hot-fuel failure modes before launch.
- 1,000-hour engine durability test:Passed a 1,000-hour, approximately 110%-load engine durability test on heavy-duty XPI platforms as part of an OEM validation program in North America.
For workshops, distributors and fleets, this validation translates into fewer injector-related comebacks, less time chasing intermittent knock or smoke complaints, and more confidence when supporting Cummins / Scania XPI engines in demanding fleet service.
Trim Code & Installation Support
Why Trim Codes Matter on Cummins / Scania XPI
Unlike some Bosch or Denso systems where mechanical shims can correct much of the variation, Cummins / Scania XPI injectors rely heavily on electronic trim codes to control cylinder-to-cylinder fuel quantity, combustion noise and emissions.
Without a valid trim code, typical results include:
- • Knock, rough idle or unstable idle speed
- • Excessive black or white exhaust smoke
- • Cylinder-contribution and other injector-related DTCs
- • Long-term risk of piston, valve or aftertreatment component damage
When Trim Coding Is Required
- Every time an XPI injector is replaced with a new or remanufactured unit
- When injectors are swapped between cylinders or between engines
- After ECU / ECM replacement or major reprogramming
- Whenever unexplained knock, rough idle, vibration or smoke appears and injector work has been carried out
Recommended Coding & Installation Steps
- 1Locate the trim code: find the unique Dieselink trim code laser-marked on the injector body or on the attached test report.
- 2Prepare the installation: clean the injector bore and sealing surfaces thoroughly; install new seals and washers as specified by the engine manufacturer.
- 3Install the injector: follow OEM torque specifications and tightening sequences for the clamp, high-pressure connector tube and return fittings.
- 4Connect an approved diagnostic tool: for example Cummins INSITE, Scania SDP3, Jaltest or another tool that supports Cummins / Scania XPI injector coding.
- 5Enter the trim code: select the correct engine and cylinder; enter the code exactly as printed; confirm that the ECM reports the code as valid and stored.
- 6Store and verify: save the configuration, start the engine, allow a short learning period at idle, then road-test under load and check for abnormal noise, vibration, smoke or new fault codes.
Support for Workshops & Distributors
- Step-by-step Dieselink XPI trim-code programming guides for popular diagnostic tools
- Remote technical support for complex coding, drivability or balancing cases
- Access to injector test data and trim-code history via Dieselink QR-based traceability
Documentation, Traceability & Warranty
Per-injector documentation
Serial number, trim code and QR code are laser-marked on each Dieselink injector; original XPI test reports are available on request.
QA / validation whitepaper
For key accounts, Dieselink can provide a summary of plant qualifications, cleanliness results and long-duration engine durability testing in a concise QA / validation whitepaper.
Standard warranty
Standard 12-month warranty under normal operating conditions, provided that installation, trim-code programming and fuel quality follow the recommended guidelines.
Extended terms
For distributors and fleets, extended or customised Dieselink warranty terms can be discussed based on volume, duty cycle and operating conditions.
FAQ – Cummins / Scania XPI Injector
This is an OEM-grade aftermarket Cummins / Scania XPI injector engineered and validated by Dieselink, manufactured in China in an OEM-grade facility with Tier-1 experience on major engine-OEM programs. It is not sold as a genuine Cummins or Scania service part; instead, it is a new-production Dieselink injector built to match Cummins XPI system requirements for form, fit and function.
Design tolerances, process control, cleanliness and testing are aligned with Cummins XPI expectations, including clean-room assembly, XPI-specific test plans and real encrypted trim codes generated from each injector's bench data. Every unit is released, branded and packaged under the Dieselink name, giving OE-level performance and full traceability at a more competitive total cost than dealer injectors, with no core charge and none of the risks associated with small-shop rebuilds or untraceable "white-box" copies.
Most rebuilt or low-cost XPI injectors are assembled without CES 16599 cleanliness controls, genuine-specification components, OEM-style test plans or the ability to generate a real encrypted trim code. They may reuse worn nozzles and solenoids and often ship with reused or invented codes. Dieselink XPI injectors are new-production units from an OEM-grade factory regularly audited to automotive Tier-1 standards, assembled in cleanrooms, validated through rig testing and long-duration engine durability programs, and supplied with a trim code generated directly from each injector's bench data.
Yes. XPI injectors have greater natural fuel-delivery scatter than many standard common-rail designs, especially at high load and high rail pressure. The ECM relies on the trim code to keep each cylinder within the target window for quantity, noise and emissions. Skipping coding or reusing old codes greatly increases the risk of knock, vibration, smoke, fault codes and emission compliance issues. Programming the correct new code typically takes only a few minutes and avoids a significant amount of troubleshooting later.
In most applications you can, provided each injector, OE or aftermarket, has its own valid trim code correctly programmed in the ECM. For high-mileage engines or critical fleets, many operators prefer to replace injectors in matched sets to maximise balance and simplify diagnostics, but it is not strictly mandatory.
If those symptoms are caused by a worn, leaking or unbalanced injector, installing a correctly coded Dieselink Tier-1-style XPI injector often resolves them. However, a full diagnostic, including cylinder-contribution tests, fuel-pressure checks and basic mechanical inspection, is always recommended to rule out compression, valve or turbocharger issues before assuming injectors are the only root cause.
Confirm fitment by OEM part number, engine model and/or VIN. Dieselink XPI injectors are designed for Cummins XPI heavy-duty families (such as ISX / ISX15 / X15 and ISG derivatives) and selected Scania XPI platforms used in trucks and buses. If you provide your OE number and engine / VIN details, our team can help verify compatibility before you order.
Every Dieselink injector has a laser-marked serial number, trim code and QR code. On request, we can print the original test report from the quality database (showing flow rates, leakage and key performance points) and include it in the box or share it digitally. For key accounts, Dieselink can also provide a QA summary or whitepaper covering plant qualifications, cleanliness reports and the 1,000-hour engine durability testing.
Standard coverage is a 12-month warranty under normal operating conditions, assuming correct installation, trim-code programming and fuel within specification. For distributors and fleets, extended or customised Dieselink warranty terms can be discussed based on volume and operating conditions, with a clear goal of providing fair support whenever an injector-related issue is traced to manufacturing.
Downloads & Technical Resources
XPI Injector Installation & Trim-Code Programming Guide (PDF)
Clear, step-by-step Dieselink instructions for removing old injectors, installing new ones and programming Cummins XPI trim codes using popular diagnostic tools.
XPI Fuel System Technical Guide – Shim, Trim Code & Failure Modes
In-depth explanation of XPI system design, the "shim myth", why simple rebuilt injectors often fail, and how genuine trim-code compensation works in Cummins / Scania applications.
Sample XPI Injector Test Report (PDF)
Example of the performance, leakage and response-time data recorded on the Dieselink XPI test bench for each injector.
Cleanroom & CES 16599 Cleanliness Control Overview (PDF)
Photo tour and explanation of the Dieselink cleanroom, ultrasonic cleaning stages, particle-counting methods and CES 16599 cleanliness standard.
XPI Injector Quality & Validation Whitepaper (PDF)
A consolidated Dieselink QA whitepaper covering 1,000-hour engine durability testing, component-level durability work and key supply-chain references for XPI injector manufacture.
Related Knowledge
Keep the sourcing conversation anchored in fitment, trim-code, and evidence signals before you request quote.
How to Confirm XPI Injector Fitment Before You Request Quote
The fastest injector quote is not the shortest inquiry. It is the inquiry built on the right identifiers. For XPI applications, different identifiers answer different fitment questions, and no single number should be treated as a universal shortcut.
Read the buyer guideWhy XPI Trim Codes Are Not Optional in the Aftermarket
On a modern XPI injector, the trim code is not decorative text. It is part of the injector’s usable identity, and buyers who treat it as optional usually discover the problem at the worst point in the process: after the quote, during installation, or in the first round of troubleshooting.
Read the buyer guideWhat Evidence Should Come With a Verified XPI Injector?
The aftermarket says “tested” far more often than it proves testing. For XPI injectors, serious buyers should expect evidence that can be tied to the actual unit or shipment: identity, fitment review, code status where relevant, test records, traceability, protected handling, and documents that agree with one another.
Read the buyer guideWhat “Verified” Means for a Dieselink XPI Injector
“Verified” is one of the most overused words in the diesel aftermarket. For XPI injectors, the term only becomes credible when it points to a structured set of checks a buyer can actually review: identity, fitment, code readiness, test status, traceability, cleanliness discipline, and consistent documentation.
Read the buyer guideRelated Products
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