0445124019 Bosch Fuel Injector 5289266 for Cummins QSB6.7 Diesel Engines

Genuine new Bosch 0445124019 common rail injector (OE Cummins 5289266, also listed as 5289266PX) for Cummins QSB6.7 diesel engines built from 09/2006 onwards. Made in Germany, supplied new in the original sealed Bosch box with the injector body O-ring and the nozzle sealing washer, and covered by a 1-year manufacturer global warranty.

This is a solenoid-actuated injector from the Bosch CRIN3-20/22 heavy-duty family, the generation built for the higher rail pressures and multiple injection events used by the Tier 3 and Stage IV / Tier 4 QSB6.7 engines. It meters the fuel for one cylinder and atomises it at full rail pressure, so a correct unit restores the original spray pattern, an even idle and clean combustion across all six cylinders.

Also known internationally as: Common Rail Injector (EN), Common-Rail-Injektor / Einspritzduse (DE), Injecteur Common Rail (FR), Iniettore Common Rail (IT), Inyector Common Rail (ES), Injector Common Rail (RO) - Bosch 0445124019 for Cummins QSB6.7.

Key features of the Bosch 0445124019 common rail injector

Product details

OEM cross-reference numbers

Compare your original part number before ordering. Vehicle or machine model alone is not enough for compatibility confirmation. Codes are shown with and without separators so they can be matched in any format.

Vehicle and machine compatibility

Compatibility must always be verified by the original part number, OEM number, VIN or engine serial number. Model alone is not sufficient.

The QSB6.7 is a turbocharged in-line six-cylinder diesel engine used across excavators, wheel loaders, telehandlers, tractors, combines, generator sets, marine propulsion and other off-highway equipment, so the same injector appears under many machine brands. Confirm fitment by the number marked on the injector actually fitted, not by the machine model.

Technical information

Related diesel fuel system components

Manufacturers used different variants of these components depending on engine build, power rating, emissions stage and production date, so another code may be the correct one for your engine. Identification is by the number on the fitted part, not by the machine model.

Shipping and warranty

Frequently asked questions

How do I know the Bosch 0445124019 fits my Cummins QSB6.7 engine? Read the number laser-marked on the injector you are removing and compare it with the cross-reference table above, or quote the engine serial number to your Cummins dealer. This injector covers both the Tier 3 build from 09/2006 and the Stage IV / Tier 4 build from 09/2013, but Cummins used several injector variants across the QSB6.7 production run, so the engine name on the rocker cover is not a confirmation on its own.

What condition is this injector supplied in? It is a genuine new Bosch injector in the original sealed Bosch box, made in Germany, covered by a 1-year manufacturer global warranty.

Is my OE number 5289266 the same part? Yes. 5289266 is the Cummins original-equipment number for this injector, and 5289266PX is the same reference in the Cummins exchange programme. The abbreviated form 9266 is laser-marked on the electrical connector of the unit we supply, next to 4019 from the Bosch number, as shown in the photographs.

What is the difference between 0445124019 and 0986435722 or 0986435721? 0445124019 is the Bosch order number for the new injector, which is what is offered on this page. 0986435722 and 0986435721 are Bosch Exchange numbers, meaning the Bosch remanufactured units supplied on an old-part-exchange basis. Buying the new injector means there is no old part to return.

Does this injector need to be coded to the ECU after installation? No. It is supplied without an individual injector accuracy code (IMA/IQA), so no calibration value has to be written to the ECU with a diagnostic tool after fitting. The normal post-repair steps still apply: bleed the system, then check rail pressure and injector return flow.

Should I replace all six injectors at the same time? Yes, the recommendation is to test and replace the complete set of six. The injectors have run the same hours and are worn to a similar degree. Fitting one new injector next to worn ones leaves the cylinders working unevenly, and the new injector then runs under a different load than the rest and wears faster, which is why a partial replacement often ends in a second repair.

What is included in the package? One Bosch injector 0445124019 with its body O-ring and the nozzle sealing washer, in the sealed Bosch box, packed at 0.602 kg in a 30 x 10 x 10 cm carton. Fitting the new sealing washer is required; do not reuse the old one.

Do I need new connector tubes as well? The injector inlet connector tube for this application is F00RC00647, and it is the part that carries the high-pressure fuel from the rail line into the injector. It is replaced rather than cleaned whenever the system has been contaminated, and many workshops renew it with the injector because its sealing cone beds into the injector it was fitted against. Other variants were used across the QSB6.7 range, so check the number on the tube fitted to your engine.

Is there a difference between the QSB6.7 and ISB6.7 versions of this injector? The QSB6.7 is the off-highway version of the same 6.7 L engine family and the ISB6.7 is the on-highway version, and Cummins did not use the same injector reference across both in every build. Order against the number on the injector you removed, or against the engine serial number, rather than against the engine family name.

Do you ship worldwide? Yes, we ship worldwide.

Common symptoms of a failing common rail injector

On the QSB6.7 a worn or leaking injector usually shows as extended cranking or an engine that starts and then stalls shortly afterwards, a rough idle with a knock from one cylinder, black smoke and loss of power under load, a drop in rail pressure the ECU cannot correct, high fuel consumption and an excessive return flow at the faulty injector. Injector-quantity and rail-pressure diagnostic trouble codes are commonly stored alongside these symptoms. A professional fuel-system test must be carried out before replacing any parts, to confirm the injector is the actual cause of the fault.

Installation and system check

Before any injector is fitted, the fuel supply system must be checked for contamination, whatever caused the original fault. Check the fuel filter and its housing, because that is where debris and sticky deposits show first.

Affected components are cleaned or replaced: the tank, the supply and return lines, the filter housing and filters, the rail and the high-pressure pump. High-pressure lines and connector tubes such as F00RC00647 are replaced, not cleaned. Flush the system, fit new filters and bleed it according to the manufacturer's procedure.

Poor or contaminated diesel is the usual cause, typically from badly stored fuel, tanks that are not cleaned periodically, or contaminated containers used for refuelling, all of which are common on machines refuelled in the field. Carry out all testing required to establish that the injectors are the actual cause of the fault before replacing any part.

Fit the new nozzle sealing washer supplied with the injector and tighten the injector clamp and the high-pressure union to the engine manufacturer's torque figures. No IMA calibration code has to be written to the ECU for this injector. An injector fitted into a system that has not been decontaminated fails again within a short service period, and that failure is not covered by warranty.

Before the new injector is fitted, the fuel supply system must be checked for contamination. Rust, water, sludge or varnish-like deposits, metallic debris or any other contaminant left in the tank, supply and return lines, filter housing or rail will damage the new injector within a short service period, and that damage is not covered by the warranty. Inspect and decontaminate the system, renew the filters and confirm that the fuel is clean before installation.