Quote:
Originally Posted by andrewwynn
I'll take the advice of somebody that runs an oil burner. I'm using general advice that impact is much less likely to break things or strip threads. Doesn't have to be 1100 ft·lb monster can be the little Milwaukee M12 screw impact.
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You are correct Andrew - the impact is much less likely to break things - and it's my usual tool of choice with threaded fittings that can be tough to break free too. It's just that in the case of these glow plugs, the outer hex is on a thin wall and the head (inc. the hex) can easily twist/shear clean off the body of the plug. These things aren't like spark plugs.
My personal approach is to tackle these slowly, on a warm engine (to soften any carbon deposits), with lots of penetrating oil and a 1/2"-drive torque wrench set to (in the case of the M57) around 25Nm. If they don't start moving before I hit 25Nm, I would stop.
Fortunately, they have always moved before then (for me). Phew!!!
