Hi There. Yes, my son was heating it with a heat gun for quite a while before I attempted to press the frozen bushing. It might've helped some but it seemed like without a clearance fit, the bushing swelled immediately when it touched the bore. I thought about a torch but wasn't crazy about messing up the paint. Thanks for the comment though!

I guess it won't since the liquid nitrogen didn't. Seems odd that the interference fit is so tight. Most people seem to have success with dry ice or liquid nitrogen.

Hello, this sure would've been easier because dry ice in my area is sold in the grocery stores and you don't need a dewar to handle it. However, dry ice is only -109F and liquid nitrogen -320F. Add your shop ambient temp to that, let's say 60F and you get a total delta of -169F vs. -380F, so over double the shrinkage of dry ice. I used one of the those online calculators for shrink of a pipe segment where you enter your ID, OD, and temp delta. Dry ice still resulted in an interference. LN2 got me to just about line on line, I thought if I worked fast it'd be OK. Nope! My conclusion after all this is that if you do the math and don't end up with a clearance fit at full shrink, don't even attempt the cold method. As soon as that cold bushing touched the hot rearframe bore, it expanded like crazy and hung up after only going in about 1/4 of the way. Brute hydraulic force finished the job. In hindsight I think the LN2 might've worked if I'd used a bore hone to knock the peaks down and better size it ahead of time. Maybe I'll try that next time. Thanks for the question.

@@StevesFarmShop Thanks for the information. Would you be able to share those links to the pipe shrinkage calculations?

Hello, sorry for the delay, been quite busy. I just did some quick searching and think the one I used is this: www.engineeringtoolbox.com/thin-circular-ring-radius-temperature-change-d_1612.html If you scroll down to the bottom of the page, you can enter your bushing diameter and temp delta. Before I tried the LN2 method, one of the only other videos I could find on the topic was the one from the Cutting Edge Engineering channel. Since he has some really nice equipment to do his own line boring and sizing, in that LN2 video he mentions some rules of thumb he uses for setting just the right amount of clearance. It's worth a watch and his videos are great.