67 Year Old Head Bolts

[racerone]

Aluminum melts at around 1200 F or thereabouts.

 

[saltchuckmatt]

I use map gas and go forever....sometimes the original OMC paint doesn't even show much harm amazing stuff.

Acetylene, map gas I've used them all. Map gas or an induction here is all you need that in a few crayons.

 

[Mc Tool]

I use map gas and go forever....sometimes the original OMC paint doesn't even show much harm amazing stuff.

Acetylene, map gas I've used them all. Map gas or an induction here is all you need that in a few crayons.

I think that the ally conducts heat away so fast that it can soak up a far bit of heat ,and I think you gain more by heating moderately and cooling a few times than you do by over heating it once
I looked at using crayons but I could never find ones the right colour.

 

[saltchuckmatt]

I think that the ally conducts heat away so fast that it can soak up a far bit of heat ,and I think you gain more by heating moderately and cooling a few times than you do by over heating it once
I looked at using crayons but I could never find ones the right colour.

Yeah colored crayons discolor the paint for sure, I just use light or dark depending on the motor so white on white and the darker on the darker.

 

[dingbat]

Funny in that all my years in welding and machine work, I don’t think I’ve ever heated aluminum to do anything other than preheat large pieces prior to welding.

Broken taps are fun. Especially #10 and smaller. Bolt wise, quicker to just break the bolt off, drill out the center of the bolt with a left hand drill, then use a bolt extractor if the bolt doesn’t back out while drilling

Determining the temp of aluminum is fun because of its lack of IR emissivity.
Experience will get you close reading the “greying” of the metal. Fortunately, aluminum oxide melts at a much higher temp than the base metal below. If you see the oxide layer breaking up your above the melting temp.