Quote:
Originally Posted by chronometers
That is why MB specs. torque to loosen plugs at. To minimize trouble, don't exceed the torque values, use pentrating oil, and work with warm engine.
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Yes, there is a group of methods that reduce the chance of breakage but there is no group of methods that guarantees 100% success.
However, the fact that the Prior Owner changed them in the past is likely to increase the odds of easy removal.
There has even been 2 instances I have read of where people have broke of the Glow Plugs in an OM617.952 and about as many have gotten the Glow Plug body our only to find the Tip/Heater Element was still stuck in the head.
The frequency of Glow Plug breakage during removal of the longer Glow Plugs in Aluminum Cylinder heads on Mercedes is rather common.
I think you have a choice to be pessimistic (I am nearly always pessimistic about things) and plan for the worst by having another ride available or being optimistic and suffering that extreme disappointment and having to scramble to get a ride to work or school during the time it takes to resolve the issue.
Anyway best wishes.