Good job man , we used to do alot of this type of work , heads off vehicles that know other garages wanted to take on , there just so long winded though and it was hard to get your hours out of the job , loads of time is cleaning faces and getting old gaskets off and so on as you know , well done for sticking at it.
With the glow plug issue , do the glows actually do a timed flash when the engines cold , loads of the common rail stuff especially with piezo injectors they don't even do a flash or don't flash until the temp goes under -6 degrees or such like , I believe they can flash on the over run or for use when the engine goes into regen modes , suppose if you want rid of the flashing glow light they would have to be done or pull the reporting wire out of the glow relay .
We have a mobile engineer bloke who we call out if we get snapped glow plugs or other broken studs and the likes ,don't know whether you ever worked on Merc cdi diesels , they have a great long 6mm diameter torx key that hold the injectors in , it's about 80 mm long , there a bassa for snapping off in the head , I've seen him drill all the way down it stepping up sizes till its at the original thread , if I tried it would just be broke drills jamming up the hole !
Good post , keep us informed how it settles down
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