Mkiii tacho drive seized screws

I don't think it has been mentioned, but some idiot my have put them in with red locktite. If so, serious heat is required (about 500f/250c). I would definitely use a laser thermometer and not got over 550f - getting too close to the melting point of the aluminum alloy for comfort.
 
JimNH said:
Although it seems counterintuitive, I heat stuck bolts and the like with an oxy acetylene torch with a tip sized to the job, in this case, smallest you have. Screw will expand and contract as the aluminum sucks the heat away. The shock should loosen. Tiny tip will direct heat fast to the screw head without the wide flame of a MAP torch.
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Yes, heating the screw itself, not surrounding material can be very effective at breaking the corrosion lock. Propane pencil flame should do it, just get it quite hot.
Let the screw completely cool before attempting to undo it, and use an impact driver (manual type you hit with a hammer is best).
 
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