heinzboehmer's 2002 Topaz 6MT Coupe

[maupineda]

Only works with copper crush washers. Heat with a torch until just glowing red and then submerge in water.

Works on Al too

[Bry5on]

Works on Al too

Most 0-state (assumption here that crush washers are 0-state) aluminum alloys should get stronger after an anneal and quench cycle, no? Anneal and air cool will maintain the anneal. At least 2xxx, 6xxx and 7xxx series alloys behave this way.

Actually, looks like 5xxx is indeed similar to copper and does not harden with quenching, so you’re right for a 5xxx, which is almost certainly what an aluminum crush washer is made from. Learn something new every day!

[ApexPothole]

I've found that the torch trick works with Al crush washers as well, its just harder to judge temp with them as they will melt before glowing noticeably. With a propane torch, I just get them glowing and quench.