Scania 1846347 HPI Unit Injector | DC12/DC13, Bench Tested & 12-Month Warranty

When a Scania heavy-duty truck comes into our workshop with rough running, poor acceleration, excessive smoke or unstable combustion, I always start with the basics: confirm the engine configuration, identify the original injector number and check the fuel-system type before selecting a replacement.

The Scania 1846347 HPI unit injector is a mechanical/electronic unit-injector reference used in selected Scania HPI applications, particularly within the DC12/DC13 family. Current injector catalogs associate 1846347 with related numbers including 1846348, 1846349, 1481827 and 1521977.

I do not recommend choosing this injector only by the truck model or by “DC12/DC13” written on a sales inquiry.

For our overseas repair-shop customers, we normally verify the original injector number, engine model, engine serial number, application and existing injector configuration before confirming the replacement.

This is especially important when several visually similar Scania HPI injectors are being used across different engine configurations.

Scania itself identifies HPI products as Unit Injectors for HPI Engines, with official service-exchange applications including DC12 and DT12 engines.

Product Overview

Important fitment note: 1846347 should not automatically be treated as interchangeable with 1846350, 574860 or 579262. Current public catalogs show 1846350/579262/1529790 as a separate HPI reference group, while 1846347 is associated with 1846348/1846349 and other related Scania HPI numbers.

Why We Recommend Verifying the Injector Before Ordering

As a manufacturer and diesel fuel-system supplier, one of the most common problems I see in international B2B orders is not product quality.

It is wrong part-number selection.

A customer may tell us:

“I need a Scania DC13 injector.”

That information alone is normally not enough.

Depending on the engine generation and fuel-system configuration, different injector numbers may be used.

For this reason, our engineers prefer to check:

• Original injector part number

• Engine model

• Engine serial number

• Vehicle series

• Production/application information

• Existing injector markings

• Quantity required

• New or remanufactured requirement

If you send us a clear photo of the original injector, we can also compare the visible identification information before confirming the order.

This extra verification step helps reduce wrong-part returns and unnecessary truck downtime.

1. HPI Unit Injector Design

Unlike a conventional common rail injector, an HPI unit injector integrates the high-pressure fuel generation and injection function much more closely with the individual cylinder.

This means the injector works as an important part of the engine's complete fuel-injection system.

For a repair shop, the practical point is simple:

The injector must be mechanically correct, internally calibrated and compatible with the engine's fuel-system configuration.

A unit injector that looks identical externally may still have different internal characteristics.

That is why we do not recommend selecting a replacement only from photographs.

2. Scania HPI Application

Scania's own service documentation distinguishes between:

• PDE unit injectors;

• HPI unit injectors;

• XPI unit injectors.

For HPI engines, Scania lists dedicated Unit Injector (HPI Engines) service-exchange parts for applications including DC12 and DT12.

This distinction is important for repair shops because HPI, PDE and XPI should not be treated as the same injector technology.

Our 1846347 page is therefore focused on HPI unit-injector applications, rather than using generic “common rail injector” wording.

3. 1846347 Application and Cross-Reference

Current aftermarket and remanufacturing catalogs commonly list 1846347 together with:

• 1846348

• 1846349

• 1481827

• 1521977

Selected catalogs associate these numbers with Scania DC12/DC13 HPI applications.

At the same time, 1846350 belongs to another commonly listed HPI reference group, associated with numbers such as:

• 1529790

• 579262

• 1764364

• 1464994 in some catalogs.

4. Bench Testing Before Shipment

We treat injector testing as an important part of our quality-control process.

Before shipment, our technicians inspect the applicable injector characteristics using dedicated diesel injector test equipment.

Depending on the product specification and test-bench capability, we check:

• Injector electrical response where applicable

• Fuel delivery

• Injection behavior

• Leakage

• Spray/atomization condition where applicable

• Mechanical condition

• Abnormal operating characteristics

• Overall test-bench results

For remanufactured injectors, we also inspect the condition of critical internal components before final assembly and testing.

Our objective is not simply to make an injector look clean.

Our objective is to supply an injector that has passed a controlled workshop inspection before it reaches your repair bay.

5. Why Injector Testing Matters on Heavy Trucks

A Scania heavy truck may operate for long hours under high load, especially in:

• Long-distance transport

• Construction

• Mining

• Regional distribution

• Heavy vocational applications

When an injector becomes worn or its fuel delivery changes, the symptoms may include:

Uneven Engine Operation

The engine may develop noticeable vibration or unstable running.

Poor Acceleration

Incorrect fuel delivery can affect combustion and engine response.

Excessive Exhaust Smoke

Poor injection performance can contribute to incomplete combustion and increased smoke.

Difficult Starting

Fuel-delivery or leakage problems can make starting more difficult.

Increased Fuel Consumption

Incorrect fuel delivery can reduce overall operating efficiency.

Cylinder Misfire or Combustion Imbalance

A fuel-system problem may result in cylinder-specific faults or abnormal combustion behavior.

However, I always tell our customers:

Do not condemn the injector based on one symptom alone.

The technician should also inspect the fuel supply, fuel filters, electrical system, engine compression and other relevant engine-management components.

6. Injector Calibration and ECU Procedures

This is another area where I recommend avoiding a universal statement.

Some diesel injection systems require specific calibration, programming or adaptation procedures after component replacement. Other unit-injector systems rely more heavily on mechanical adjustment and the engine's existing control strategy.

Therefore, after installing a 1846347 injector, the workshop should follow the applicable Scania service procedure for the exact engine configuration.

Where calibration or electronic adaptation is required, use the appropriate diagnostic equipment and record the injector identification information before returning the vehicle to service.

We can provide technical guidance based on the injector number and engine configuration supplied by the customer.

7. Installation Recommendations for Repair Shops

A replacement injector should never be installed into a contaminated or poorly prepared fuel system.

Before installation, I recommend checking:

• Injector bore cleanliness

• Injector seat condition

• Sealing components

• Fuel contamination

• Fuel filter condition

• Fuel-line cleanliness

• Electrical connections where applicable

• Injector identification

• Engine-side adjustment requirements

After installation:

1. Follow the correct installation procedure.

2. Use the specified sealing components.

3. Perform the required mechanical adjustment if applicable.

4. Complete the required electronic calibration/adaptation if applicable.

5. Start the engine and check for abnormal operation.

6. Inspect for fuel leakage.

7. Check diagnostic data and fault codes.

8. Carry out a road or load test where appropriate.

Always use the applicable Scania workshop procedure for torque, adjustment and installation specifications.

8. Fuel Contamination: The Problem Behind Repeat Injector Failures

When an injector fails shortly after replacement, the injector itself is not always the original cause.

In our experience, the workshop should investigate:

• Dirty fuel

• Water contamination

• Blocked or incorrect fuel filters

• Fuel-system wear

• Metal particles

• Incorrect installation

• Damaged sealing components

• Poor fuel-system maintenance

If contamination is present, replacing one injector without addressing the contamination source can result in another failure.

For fleet customers, this is particularly important because repeated injector replacement costs much more than the injector itself.

It also means unnecessary vehicle downtime.

9. New and Remanufactured Options

We support both new and remanufactured injector supply, depending on the part number and customer requirements.

New Injector

For customers who prefer a new replacement component for workshop repair or fleet maintenance.

New Aftermarket Injector

For distributors and repair shops that require a competitive replacement option.

Remanufactured Injector

For customers who want a cost-effective alternative and accept the applicable exchange/core-return process.

For remanufactured products, a core deposit may apply depending on the order arrangement.

We recommend that customers confirm the core-return requirement before placing a remanufactured order.

10. Our Remanufacturing Approach

For remanufactured injectors, our technicians do not simply clean the external surface and resell the old injector.

The process focuses on:

Core Inspection → Cleaning → Component Inspection → Replacement of Required Components → Assembly → Bench Testing → Final Inspection → Packing

Critical components are inspected according to the applicable product specification.

The final injector must pass our applicable bench-testing requirements before shipment.

This is particularly important for B2B customers who purchase multiple units for workshop stock.

11. 1846347 Cross-Reference Table

For our customers' convenience, we currently use the following reference structure:

Public industry catalogs support these separate reference groups, but exact interchangeability should still be confirmed against the original injector and engine configuration.

12. Selected Scania HPI Injector Product Range

Scania 1529790 HPI Injector | 24V System, 1.35 kg Class & DC12.10 Application

Part Number: 1529790
Reference Numbers: 574860, 1846350, 579262
Application: Selected DC12.10 / DC13 HPI applications
System: HPI Unit Injector
Voltage: 24V class
Weight: Approximately 1.35 kg
Quality: New / Remanufactured
Warranty: 12 months

The 1529790 reference is consistently associated in current catalogs with 574860, 1846350 and 579262, and is listed for Scania HPI applications including DC12.10.

Scania 1731091 HPI/XPI Injector | 24V System, 1.35 kg Class & Long-Haul Support

Part Number: 1731091
Reference Numbers: 1846351, 1764365
Application: Selected Scania DC13 and related applications
System: Verify HPI/XPI configuration before ordering
Voltage: 24V class
Weight: Approximately 1.35 kg
Quality: New / Remanufactured
Warranty: 12 months

Because public catalogs classify related 1731091/1764365 applications differently, we recommend confirming the exact engine configuration before shipment.

Scania 1764364 HPI Injector | 24V System, 1.35 kg Class & DC13 Support

Part Number: 1764364
Reference Numbers: 1846350, 579262, 1529790
Application: Selected Scania DC13 / related HPI applications
System: HPI Unit Injector
Voltage: 24V class
Weight: Approximately 1.35 kg
Quality: New / Remanufactured
Warranty: 12 months

1764364 is listed in current injector catalogs as part of the 1846350/579262/1529790 reference group.

Scania 1764365 HPI/XPI Injector | 24V System, 1.35 kg Class & DC13 Applications

Part Number: 1764365
Reference Numbers: 1846351, 1731091
Application: Selected Scania DC13 / related applications
System: Verify HPI/XPI configuration
Voltage: 24V class
Weight: Approximately 1.35 kg
Quality: New / Remanufactured
Warranty: 12 months

We recommend checking the original injector identification because 1764365 is associated with 1846351 and 1731091 in current industry listings.

Scania 1846347 HPI Injector | 24V System, 1.35 kg Class & DC12/DC13 Applications

Part Number: 1846347
Reference Numbers: 1846348, 1846349, 1481827, 1521977
Application: Selected Scania DC12/DC13 HPI applications
System: HPI Unit Injector
Voltage: 24V class
Weight: Approximately 1.35 kg
Quality: New / Remanufactured
Warranty: 12 months

1846347 is listed in current industry catalogs as a Scania HPI unit injector and is associated with 1846348, 1846349 and related HPI reference numbers.

Scania 1846348 HPI Injector | 24V System, 1.35 kg Class & P/G Series Support

Part Number: 1846348
Reference Numbers: 1846347, 1846349, 1521977, 1521978
Application: Selected Scania DC12/DC13 HPI applications
System: HPI Unit Injector
Voltage: 24V class
Weight: Approximately 1.35 kg
Quality: New / Remanufactured
Warranty: 12 months

This number is commonly grouped with the 1846347/1846349 HPI injector family in current catalogs.

Scania 1846349 HPI Injector | 24V System, 1.35 kg Class & DC13 Support

Part Number: 1846349
Reference Numbers: 1846347, 1846348, 1499714, 1499257, 1521978
Application: Selected Scania DC13 HPI applications
System: HPI Unit Injector
Voltage: 24V class
Weight: Approximately 1.35 kg
Quality: New / Remanufactured
Warranty: 12 months

1846349 belongs to the Scania HPI injector family and is listed in current catalogs with several related DC13 injector references.

Scania 1846350 HPI Injector | 24V System, 1.35 kg Class & DC12.10/DC13 Fitment

Part Number: 1846350
Reference Numbers: 1529790, 574860, 579262, 1764364
Application: Selected Scania DC12.10/DC13 HPI applications
System: HPI Unit Injector
Voltage: 24V class
Weight: Approximately 1.35 kg
Quality: New / Remanufactured
Warranty: 12 months

1846350 has one of the clearest public cross-reference groups in this range: 1529790 / 574860 / 579262. A remanufacturer also identifies 1846350 as an HPI Gen 3 injector for DC12.10/13.

Scania 1846351 HPI/XPI Injector | 24V System, 1.35 kg Class & Long-Haul Applications

Part Number: 1846351
Reference Numbers: 1731091, 1764365
Application: Selected Scania DC13 and related applications
System: Verify exact HPI/XPI configuration
Voltage: 24V class
Weight: Approximately 1.35 kg
Quality: New / Remanufactured
Warranty: 12 months

Because catalogs differ in how they classify related 1846351/1764365/1731091 applications, we recommend confirming the engine and injector configuration before shipment.

13. Scania HPI vs XPI — Do Not Order by Engine Model Alone

One of the most common purchasing mistakes we see is confusing HPI and XPI injectors.

Scania's own parts documentation separates:

Unit Injector (HPI Engines)

from

Unit Injector (XPI Engines).

These are different fuel-system technologies.

Therefore, if a customer tells us:

“I need an injector for Scania DC13.”

we still ask for the original part number or engine details.

The same engine-family name does not necessarily mean that every injector is interchangeable.

14. B2B Supply for Scania Repair Shops

We supply Scania diesel injectors to:

• Heavy-truck repair workshops

• Fleet maintenance companies

• Scania specialist repair shops

• Engine rebuilding centers

• Construction fleet workshops

• Mining equipment service companies

• Diesel parts wholesalers

• Regional distributors

• Truck parts importers

For regular B2B customers, we can support:

Mixed Part Numbers

Combine different injector part numbers within one order according to the applicable MOQ.

New and Remanufactured Supply

Choose the quality level according to your workshop requirements and budget.

Neutral Packaging

Neutral export cartons are available for distributors who want to sell under their own local brand.

Customer Logo Packaging

Customized packaging can be discussed for qualified wholesale orders.

Core Return Support

Remanufactured injector orders may use an exchange/core-return system depending on the product.

Technical Matching

Our engineers can help compare the original injector number with our available stock before shipment.

Global Logistics

We arrange international delivery through suitable logistics channels according to destination, order size and urgency.

15. Our Quality-Control Process

Our workshop follows a controlled process:

1. Part Number Verification

We confirm the requested injector number.

2. Application Review

We check the engine and application information supplied by the customer.

3. Component Inspection

New or remanufactured injector components are inspected.

4. Assembly

Remanufactured units are assembled according to the applicable process.

5. Bench Testing

The completed injector is tested using suitable diesel injector test equipment.

6. Final Inspection

The injector is visually and technically inspected before packing.

7. Export Packing

The product is packed for international shipment.

This workflow is designed around one objective:

Reduce the risk of receiving an incorrectly identified or insufficiently tested injector.

16. 12-Month Warranty

We provide a 12-month warranty for applicable injector products according to our sales and warranty terms.

For a warranty case, we normally ask the workshop to provide:

• Part number

• Order information

• Engine model

• Engine serial number where available

• Installation information

• Fault codes

• Test results

• Photos or videos if necessary

This information allows our engineers to distinguish between a possible injector problem and another fuel-system or engine fault.

17. Frequently Asked Questions

Q1. Is 1846347 the same as 1846350?

We do not recommend treating them as automatically interchangeable.

Current catalogs place 1846347 in the 1846347 / 1846348 / 1846349 / 1481827 / 1521977 family, while 1846350 is commonly associated with 1529790 / 574860 / 579262 / 1764364.

Please confirm the original injector number before ordering.

Q2. Does 1846347 fit every Scania DC12 or DC13?

No.

It is intended for selected HPI applications. Engine configuration and original injector identification should be checked before shipment.

Q3. Is 1846347 a common rail injector?

We recommend describing it as a Scania HPI Unit Injector, not simply as a conventional common rail injector.

Scania itself distinguishes HPI unit injectors from XPI injectors in its parts documentation.

Q4. Does the injector require ECU coding?

The procedure depends on the specific engine and fuel-system configuration.

Where electronic calibration/adaptation is required, the workshop should use the appropriate Scania diagnostic/service procedure.

Q5. Do you supply new and remanufactured injectors?

Yes.

We supply new and remanufactured options depending on the part number, quantity and current stock.

Q6. Do you accept old injector cores?

For applicable remanufactured/exchange products, a core-return or core-deposit arrangement may apply.

Please confirm this when ordering.

Q7. What is the warranty period?

Our standard warranty for applicable injector products is 12 months.

Q8. What is the delivery time?

For stocked items, our normal preparation target is 3–7 working days, depending on quantity and order confirmation.

Q9. Can I mix different injector part numbers?

Yes. We support mixed part-number orders for qualified B2B customers according to the applicable MOQ.

Q10. Can you help identify the correct injector?

Yes.

Send us the original injector number, engine model, ESN and a clear photo of the injector if available.

Our engineers will check the information before we confirm the replacement.

18. Why Repair Shops Choose Us

From my experience working with diesel fuel-system components, the cheapest injector is not necessarily the lowest-cost solution.

For a repair shop, the real cost can include:

Wrong part + installation labor + vehicle downtime + repeated diagnosis + customer complaint + second repair.

That is why we focus on:

• Accurate part-number matching

• HPI/XPI/PDE system identification

• Controlled bench testing

• New and remanufactured options

• Flexible B2B MOQ

• Mixed part-number orders

• Neutral export packaging

• 12-month warranty

• Technical communication before and after shipment

Our goal is to help your technicians spend less time dealing with wrong-part problems and more time completing the repair correctly.

19. How to Order the Correct Scania Injector

If you are not sure whether you need 1846347, 1846348, 1846349, 1846350 or another Scania HPI injector, send us:

1. Original injector part number

2. Engine model

3. Engine serial number

4. Truck model / series

5. Original injector photo

6. Quantity required

7. New or remanufactured preference

We will compare the information with our available injector references and confirm the appropriate product before shipment.

Engineering Note

I recommend that every repair shop verify a Scania HPI injector by original part number + engine configuration, rather than selecting the part only from the truck model.

Scania's own documentation distinguishes HPI unit injectors from PDE and XPI systems, and its service-exchange documentation confirms dedicated HPI injector applications for DC12/DT12 engines.

For the 1846347 family, public parts catalogs consistently show related numbers such as 1846348, 1846349, 1481827 and 1521977, while 1846350 / 1529790 / 574860 / 579262 form a different and more clearly documented reference group.

This is why we verify the original injector before confirming an order.

Send us the original part number or injector photo. We will help you confirm the correct HPI injector before shipment.