Originally Posted by
daniell
Would a CO2 cartridge get cold enough?
Spraying CO2 could get the part down to temperature -60°C but a CO2 cartridge would not hold enough or spray long enough to do the job. There are a number of ways to get the temp down. For instance Dry Ice pack, R type refrigerants $$$, even highly flammable liquid hydrocarbons, but the cheapest and safest source I have found is the DutOff type air sprayer. Just hold the can upside down and spray to cool the entire head and stem. Then tap the stem with a hammer and see if it can break free a little. That will allow your PB-Blaster to get deeper into the joint and possibly loosen it. This method is a real winner when used on dissimilar metals. I only mention it here as it is not well described in the "Stuck Stem Youtube Aannals"...