I do a bit of amateur work on old outboard motors, which have steel-based bolts that need heat to free them from aluminium alloy parts that they're salt-corroded into. (I also get a bit of unwanted practice on drilling out the ones that can't be removed with heat )
The hottest gas I have is MAPP.
Usually I make a bit of a heat shield around the bolt head to reduce the risk of melting the alloy part it's in while trying to get heat down the bolt.
Am I being too careful or could I melt the alloy with MAPP gas?
Would I get better results on removing bolts, without damaging a scarce 50 year old cylinder head and its water cover, if I just heated the whole area with MAPP gas?
The hottest gas I have is MAPP.
Usually I make a bit of a heat shield around the bolt head to reduce the risk of melting the alloy part it's in while trying to get heat down the bolt.
Am I being too careful or could I melt the alloy with MAPP gas?
Would I get better results on removing bolts, without damaging a scarce 50 year old cylinder head and its water cover, if I just heated the whole area with MAPP gas?