That is what is making me concerned. If it was just as simple as lubricate, warm engine, and limit the torque, I would be willing to try. But the tales I have read of them snapping off at very low torques has me scared to even put a wrench on it.

Also I have read that GP failure on these engines is bad while running, which is not like the older IDIs. CDIs use the plugs during the drive cycle for DPF regen and having a failed GP can cause accelerated carbon buildup in that cylinder.

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech