How To Mercedes Benz Sprinter OM642 Injector seals.
Black Death is the result of bad injector seals.

Smell exhaust in the cab? Odds are thes are BAD
Can also effect fuel economy

Amazon links to tools required
IRWIN 12001ZR Tap Wrench #0-1/4" T-Handle https://amzn.to/4f0V0VA
Metric Thread Tap M6 X 1.0 https://amzn.to/4f2hUMm
Klein Tools 65720 7-Inch Ratchet, 3/8 https://amzn.to/4hbzkID
TEKTON 3/8 Inch Drive x 6 Inch https://amzn.to/3ZRVTM7
CRAFTSMAN CMHT65073 CFT SD BI-MATERIAL 4PC PRECISION https://amzn.to/3U4XGJV
LEXIVON Inch Pound Torque Wrench 1/4 https://amzn.to/3NjWWwW
Permatex 80078 Anti Seize Lubricant (High Temperature) https://amzn.to/3ZWDzBn
YXQ 12Pcs Tube Brush Kit Stainless Steel/Brass Round https://amzn.to/3BF9c8z
B'laster 16-PB Penetrating Catalyst - 11-Ounces https://amzn.to/4eC0Ehf
AUTOKAY 6110170060 Lower Fuel Injector Nozzle Seal https://amzn.to/4eWYZCE
TEKTON 3/8 Inch Drive x T40 Torx Bit https://amzn.to/3A2LaDQ
Diesel Injector Puller Tool with Slide Hammer, Common Rail Injector Remover https://amzn.to/3Y0OuaA