0445116027 — Technical Research
Bosch piezo common-rail injector for the Mercedes-Benz 3.0 V6 diesel (OM642), also used on the Jeep/Chrysler 3.0 CRD. Bosch exchange 0986435406; Mercedes OE A6420701287 (and related A6420701187). Bosch alternate 0445116028. Piezo and solenoid injectors are not interchangeable. Replacements are coded to the ECU. Failures are driven by poor fuel filtration, contamination and back-leakage. Key symptoms: Rough idle / vibration; Hard starting; Loss of power / limp mode; Black smoke. Common failure modes: Internal wear / high back-leakage; Piezo stack degradation; Nozzle coking.
Bosch 0445116027 3.0 CDI/CRD (OM642) V6 Piezo Common Rail Injector (Mercedes/Jeep)
Bosch piezo common-rail injector for the Mercedes-Benz 3.0 V6 diesel (OM642), also used on the Jeep/Chrysler 3.0 CRD. Bosch exchange 0986435406; Mercedes OE A6420701287 (and related A6420701187). Bosch alternate 0445116028. Piezo and solenoid injectors are not interchangeable. Replacements are coded to the ECU. Failures are driven by poor fuel filtration, contamination and back-leakage. Key symptoms: Rough idle / vibration; Hard starting; Loss of power / limp mode; Black smoke. Common failure modes: Internal wear / high back-leakage; Piezo stack degradation; Nozzle coking.
A leaking injector unbalances cylinder fuelling on the 3.0 V6.
Excess back-leakage drops cranking rail pressure.
Out-of-range delivery or rail-pressure deviation cuts power.
Poor atomisation over-fuels the cylinder.
Cylinder-specific injector or fuel-metering codes.
- InstallationCode the injector calibration value to the correct cylinder with XENTRY/diagnostic before road test.
- InstallationRenew the combustion seal and hold-down hardware; clean the injector bore to prevent 'black death' carbon build-up.
- WarningPiezo and solenoid injectors are not interchangeable - confirm 0445116027 (piezo) and the exact OE before ordering.
- MisdiagnosisRead live back-leakage / cylinder-balance data to find the weak cylinder before removal.
- TestingBench-test on a piezo-capable CR tester; verify response and spray pattern before refit.
What is Bosch injector 0445116027?+
A Bosch piezo common-rail diesel injector for the Mercedes-Benz 3.0 V6 diesel (OM642), also used on the Jeep/Chrysler 3.0 CRD. Bosch exchange 0986435406; Mercedes OE A6420701287.
Which vehicles use 0445116027?+
Mercedes Sprinter, Vito/Viano, C/E-Class, ML/GL/R-Class 3.0 CDI and Jeep Grand Cherokee 3.0 CRD (OM642).
Is it solenoid or piezo?+
It is a Bosch piezo common-rail injector - do not substitute a solenoid injector.
Does 0445116027 need coding?+
Yes - code the injector calibration value to the correct cylinder with Mercedes XENTRY when fitting.
What are the OE part numbers?+
Mercedes A6420701287 (and A6420701187) reference Bosch 0445116027; the Bosch exchange number is 0986435406 and 0445116028 is an alternate.
What is 'black death' on the OM642?+
It is carbon build-up around a leaking injector bore from combustion blow-by; clean the bore and renew seals when fitting injectors.
What are the symptoms of failure?+
Rough idle, vibration, hard starting, black smoke, power loss/limp mode and an EML.
Why does my OM642 3.0 V6 run rough?+
A worn or leaking injector unbalances fuelling; read live cylinder-balance data and bench-test the suspect cylinder.
What causes these injectors to fail?+
Poor fuel filtration, contamination and back-leakage wear plus piezo-stack ageing - fix the cause first.
Does a remanufactured 0445116027 perform like new?+
A properly remanufactured injector is bench-tested and recalibrated on a piezo-capable tester, then coded on fitment.