bolt issues
 

hey guys im trying to put test pipes on my nismo. i cant get the top bolts on the cats to come loose. ive tried using pb blaster and a breaker bar and got nothing but a 3hr headache. Anybody have any ideas im open for anything at this point. Ive never in my life had this much trouble trying to get 2 bolts loose.

Let the PB Blaster sit overnight and try it again in the morning. They call them the "demon bolts" for a reason. They will really test your patience.

Look and see if this helps?

http://www.the370z.com/diy-section-d...er-victim.html

Get a bigger hammer. J/k. Let the on sit over night and then work the bolt, it may require a little patientence but it will come loose.

It helps if you let them soak and then, right before you attempt to remove them, start the car to let them heat up and expand slightly. This is how I got the driver's side off with ease and sheared a bolt on the passenger side because I didn't.

Good Luck!

This is the procedure I used and it worked like a charm.

Tools required:
2-ft breaker bar
Several 1/2 inch extension bars (about 32" worth)
6-pt socket

Process:
Disconnect and completely remove stock airboxes. This will give you a direct straight path from the engine bay to the top bolts and improve on the amount of torque that you can directly apply by eliminating the swivel joint.

If the bolt still won't break free then it is probably cross-threaded. You can try to apply direct heat to the nut with a torch to try and expand it, this might get you a couple of turns before seizing up again once the metal temperatures equalize. Spray the bolt with water and repeat. Plan B, bigger breaker bar and sheer the bolt.

The other problem I had was with one of the stock O2 sensors. One of them came out with ease, the other was cross threaded and stripped the O2 sensor threads as it came out. $100 for a new O2 sensor on rockauto.com.