Marvelicious
Naturally Aggravated
So I've torn down the top end, I'm reasonably happy that the pistons and sleeves are good for another go-round, since the budget is tight, but I'd really like to rephase the crank and drop in the OD 5th, since I'm already in this deep. In a perfect world I'd just drop it in the mail and send it to Hugh, but a friend once told me that in a perfect world they'd make milkshakes that taste like teenage girls. Pray he never has children...
Anywho... I was thinking on doing the dirty deed myself, but was reading on Hugh's blog about the crankshaft walking apart problem and the tig welding solution. Now I can run a tig torch, but I don't have a rig at the house. It popped into my head that I remembered a high temp bearing retaining compound that loctite makes - 620 seems to be the one with the most realistic specs. It takes over an hour to start curing, longer in cold temps and actually heat cures stronger at the temps our engines run, and its 100% resistant to oil. Cured at 120C it has a shear strength of nearly 5000psi, which isn't nearly on par with welding's 70,000, but the weld only runs around the edge of the joint while this is applied to the entire joint, so I'm fairly confident in the strength factor as well.
My only question is whether it is reasonable to shoot for being able to true the crank up inside that hour work time? Could I just work one joint at a time, truing each pin first, then curing them before reassembling the splined center and truing it? Not 100% how I'd go about that, but thats why I'm asking for input! I know I'd have to be extra careful on tolerances, making sure they didn't stack, so to speak.
Any thoughts? Does this seem reasonable? Should I just suck it up and find a tig machine I can get access to for a couple hours?
Anywho... I was thinking on doing the dirty deed myself, but was reading on Hugh's blog about the crankshaft walking apart problem and the tig welding solution. Now I can run a tig torch, but I don't have a rig at the house. It popped into my head that I remembered a high temp bearing retaining compound that loctite makes - 620 seems to be the one with the most realistic specs. It takes over an hour to start curing, longer in cold temps and actually heat cures stronger at the temps our engines run, and its 100% resistant to oil. Cured at 120C it has a shear strength of nearly 5000psi, which isn't nearly on par with welding's 70,000, but the weld only runs around the edge of the joint while this is applied to the entire joint, so I'm fairly confident in the strength factor as well.
My only question is whether it is reasonable to shoot for being able to true the crank up inside that hour work time? Could I just work one joint at a time, truing each pin first, then curing them before reassembling the splined center and truing it? Not 100% how I'd go about that, but thats why I'm asking for input! I know I'd have to be extra careful on tolerances, making sure they didn't stack, so to speak.
Any thoughts? Does this seem reasonable? Should I just suck it up and find a tig machine I can get access to for a couple hours?