Bosch 0445120177 Common-Rail Injector — Clean Power For Cummins 6.7 / ISB & QSB Platforms

Rough idle, longer hot starts, and a haze of diesel smoke under light throttle are classic signs that one injector in your Cummins isn't keeping up anymore. The Bosch 0445120177 common-rail injector (also written 0 445 120 177) is a factory-pattern replacement used on a wide range of Cummins ISB / QSB 4.5, 5.9 and 6.7 L engines-on the road and in the dirt. It's widely cataloged for 6.7L Dodge Ram pickups, medium-duty trucks (Freightliner, Kenworth, Volvo) and industrial equipment powered by QSB engines.

 

 

Most catalog entries show the same core identity:

Bosch number: 0445120177 / 0 445 120 177  

Cummins crosses: 5254261, plus variants 5254261NX / PX / RX / QX / 5254261006R  American Diesel Parts+3Dale's Super Store+3TurboDiesels.com+3

Other cross refs often listed: 6755-11-3100 / 6755113100 for some Komatsu/industrial applications 

Engine families: ISB 4.5 / 5.9 / 6.7, QSB 4.5 / 6.7 used in trucks and off-highway equipment  

If your old injector body is laser-etched with 0445120177 or your Cummins part list calls out 5254261, you're in the right place.

 

 

Online fitment tables and listings link this injector to:

Dodge® / Ram® 6.7L pickups and cab-chassis platforms using the 6.7 ISB

Freightliner, Kenworth, Volvo medium-duty trucks built around Cummins ISB 6.7 engines Dale's Super  

Construction & industrial equipment running QSB 4.5 / QSB 6.7 power units (wheel loaders, excavators, gensets, etc.)  

Because Cummins reuses the ISB/QSB architecture in many chassis, most professional sellers ask for an engine serial number (ESN) to confirm the match-good practice you can copy on your own site.

 

 

Bosch's CRIN-series injectors are designed to keep tight control of three things that matter in a 6.7 Cummins:

Leak-back / return flow
As injectors wear, internal leakage rises and the rail struggles to reach target pressure. A fresh 0445120177 restores sealing so the ECM can hit commanded rail pressure faster-especially noticeable in hot-start behaviour. 

Spray pattern & atomization
Proper cone angle and ultra-fine droplets reduce the grey puff you see when pulling away or stepping into the throttle, and they make life easier for your DPF and EGR system where fitted 

Cylinder-to-cylinder balance
Flow-matched injectors smooth out the ISB's idle, cut down "thump" in the cab, and help fuel consumption return to where it should be.

 

 

Type: High-pressure common-rail diesel injector

Technology: Bosch solenoid-actuated CR injector (0445-120-177 family)  

Typical condition offered online:

New genuine Bosch for Cummins 6.7 ISB & QSB 

Or premium reman units fully disassembled, rebuilt and multi-point tested, often with 12–24 month warranty 

Typical applications:

ISB 4.5 / 5.9 / 6.7 truck engines

QSB 4.5 / 6.7 industrial / off-highway engines

 

 

To turn 0445120177 into real-world improvement instead of just a shiny part:

Diagnose first
Run a return-flow (leak-off) test on all six cylinders. Replace the injector(s) that are out of family rather than guessing.

Prep the bore
Clean the injector seat, remove carbon build-up, and always fit new copper washers and O-rings. A dirty seat will ruin sealing and can mimic injector failure.

Install & torque correctly
Fit the new 0445120177 / 5254261 to Cummins torque spec. Avoid prying on the body or over-bending high-pressure lines.

Bleed & code (where required)
Prime the system, then-on ECMs that support it-enter the new injector's trim code so the ECU can fine-tune quantity per cylinder.

Prove it
Check for:

Shorter hot-crank time

Smooth idle with lower correction values

Reduced smoke at 1,400–2,000 rpm, where most work actually happens

 

 

"0445120177 Bosch injector for Cummins 6.7 ISB / QSB" 

"5254261 common rail fuel injector Dodge Ram 6.7" 

"Cummins ISB 4.5 5.9 6.7 diesel injector 0 445 120 177"

 

 

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