3.0L V6 CDI · Remanufactured
3.0L V6 CDI Remanufactured Piezo Injector (Mercedes OM642)
OM642, OM642DE30LA
Burnt-diesel smell with black tar-like build-up around an injector (the documented 'black death'); chuffing or hissing from the injector area at idle; hard starting, particularly warm starts; rough idle or misfire-like running; smoke and reduced power when a leak is advanced. When two or more appear together, suspect the injector before peripherals — a comparative leak-off test isolates the failed unit without tear-down.
Injector copper seal / seat failure letting combustion gas carbonise around the injector base; piezo injector internal faults degrading atomisation and drifting correction values out of range; injectors carboning into the bore when seal leaks are left unrepaired, making removal difficult. Internal wear cannot be repaired in situ — once delivery drifts outside calibration, remanufacture or replacement is the reliable fix.
Inspect around every injector for black crust before diagnosis — the failure is often the seal and seat, not the injector body. Clean or recut the injector seat before fitting a replacement; always use a new copper sealing washer. Check injector correction values across all six cylinders — an outlier identifies the failing unit. Address seal leaks early: a long-running leak can seize the injector into the head. Never condemn a common-rail injector on a fault code alone.
Each remanufactured A6420700587 is fully stripped, ultrasonically cleaned and inspected; worn components are replaced with OE-grade parts. The rebuilt unit is calibrated on a common-rail test bench against the manufacturer's specification — delivery, back-leak and response verified — and despatched with a 12-month parts warranty and its calibration data on file.
The A6420700587 trusted family covers 9 verified vehicle fitments across 3 makes: Chrysler, Jeep and Mercedes-Benz. Every fitment listed is registry-verified.
A6420700587 cross-references 7 further OE numbers, including A6420701387, A6420701587, 0445115064, 0445115027, 0445115063, 0986435355 and A6420701887. Always match the reference etched on your failed unit's body.
UK diesel injector specialists supplying OEM tested and calibrated remanufactured injectors. Trusted by garages and mechanics nationwide with 12-month warranty on every part.