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I just finished my front end rebuild a couple weeks ago. My problem was with the rear bolt. It was rusted inside the control arm. I used PB Blaster for about a week 3-4 times a day and an airgun. It eventually broke loose. If you can't get an airgun, breaker bar with additional steel tubing to give you more leverage. I had one on the driver's side also that I used heat on and it came right out.
Good luck.
www.kanolabs.com Aero koril. PB Blaster is JUNK. When I rebuilt the front and rear suspention on my vette I started out using PB blaster and liquid wrench and I couldnt get anything to budge without severe force being applied. I got a can of Kroil from my dad, put it on the ones I had left. Litterly 10 minutes and the whole thing was apart. Even unseized the trailing arm bolts (i still cut them out because the fenders were in the way).
www.kanolabs.com Aero koril. PB Blaster is JUNK. When I rebuilt the front and rear suspention on my vette I started out using PB blaster and liquid wrench and I couldnt get anything to budge without severe force being applied. I got a can of Kroil from my dad, put it on the ones I had left. Litterly 10 minutes and the whole thing was apart. Even unseized the trailing arm bolts (i still cut them out because the fenders were in the way).
Koril rocks. I heard of something else called seafoam I think that works great too.
By the way when you torch it you torch the surrounding shaft, right?, and not the bolt itsself?
Right - heat and expand the shaft.
The bolt will get hot too - but apply direct flame to shaft.
Trouble with large breaker bar here is access.
You need to use a LONG extension to get down at the bolt.
The extension (at least mine) started to twist under the heavy torque.
Easier to do with engine out and body removed.
I think seafoam is for "fogging" a motor for long term storage ... often done with boat motors.
Ahhhh ... I see they have a product called "Deep Creep".
No ... usually they come right out.
I've rebuilt several C3 front ends ... only one stubborn bolt on the cross-shafts.
Re-assembly should include anti-seize compound.
I am always leary of tightening. I like to avoid snapped bolts, and I would not want to strip that nut block that has the two thraeded holes for the two smalled bolts.
Sometimes snapped bolts are a blessing
Sure beats wrestling with the threads for hours
Yeah, I've had a few borken bolts that helped the project out, but if threads are stuck, I hate removing broken studs out of threaded bores. Sometimes you can't get a drill in where you're working to start the removal process. But yeah, I see your point.
Studs are a whole different story..... nobody wants to play the stud removal game..
My step Dad has an old Ford truck...it's a mutant beast, mixed with parts of old dump trucks and Int. school buses. Anyway, the 360 he has in it has had exhaust leaks it's entire life, and in the process of fixing said leak, he snapped two bolts off in the heads. On those engines the exhaust bolts thread at an upward angle, and with the engine in the truck, it's VERY hard to drill out the studs and chase the threads. I helped him with the project as he just didn't have the strength to hold the drill up at that angle enough to get a bite with the bit. I HATE drilling broken bolts. Sorry...hijacked.