Serious need of help!

ADVAN23 · 05-31-2021, 07:42 PM

Hi all, I am in the process of unbolting my differential so I can install my Z1 bushing replacements and the 17mm flange nut which bolts to the subframe is warping and rounding itself completely. I honestly think there is locktite on the nut because I had to special order a 17mm bolt extractor and it STILL wont come off and the extractor has literally chewed through the outer wall completely. I don't know what to do..any ideas!? Anyone had this issue?

Spooler · 05-31-2021, 08:02 PM

Not good. No sure what to tell you on this one.

jchammond · 05-31-2021, 08:27 PM

jchammond · 05-31-2021, 08:31 PM

When you finally manage to get the bushing out the hole, it’ll look like this

Or at least supposed to

Leingod · 05-31-2021, 08:33 PM

Maybe one of those butane pen torches to heat up the bolt without getting the surrounding area to hot?

Rusty · 05-31-2021, 08:46 PM

What you may try to do. Is to cut the inner bushing with a deep hole saw. And remove it with the diff. Once out. Then you will have an easier time with it. Cut the inner shell away from the stud and nut.

Hole saw

https://www.homedepot.com/p/DIABLO-2...00CT/301697691

40 to 332 · 05-31-2021, 08:50 PM

I agree with Spooler ... not good. Working from the rear of the subframe, would it be possible to use a drill fitted with a bit or a 2" hole saw to drill out the bushing itself so that you could carefully back out the differential with what's left of the bushing still attached (... after removing the front mounting bolts of course)? At least you could then approach the problem with the differential removed from the car. I expect some shop would be able to remove the nut once the differential was out. That said, I'm not sure if there is enough room at the rear-side of the subframe to drill out the bushing. IIRC there's not a lot of space back there.

Rusty · 05-31-2021, 09:10 PM

Quote:

Originally Posted by 40 to 332

I agree with Spooler ... not good. Working from the rear of the subframe, would it be possible to use a drill fitted with a bit or a 2" hole saw to drill out the bushing itself so that you could carefully back out the differential with what's left of the bushing still attached (... after removing the front mounting bolts of course)? At least you could then approach the problem with the differential removed from the car. I expect some shop would be able to remove the nut once the differential was out. That said, I'm not sure if there is enough room at the rear-side of the subframe to drill out the bushing. IIRC there's not a lot of space back there.

That is what I was thinking.

40 to 332 · 05-31-2021, 10:00 PM

Quote:

Originally Posted by Rusty

That is what I was thinking.

Yes, once the diff is out, it probably wouldn't take much effort to hack the bushing apart tp reveal the stub bolt and nut ... which could then be removed with a pair of vice-grips.

Dreadnaught · 06-01-2021, 02:13 AM

Quote:

Originally Posted by 40 to 332

Yes, once the diff is out, it probably wouldn't take much effort to hack the bushing apart tp reveal the stub bolt and nut ... which could then be removed with a pair of vice-grips.

This is probably your best bet.

When I put in my polyurethane diff and sub frame bushings I had to remove the muffler(s), rear sway bar and the V shaped brace. With those parts removed, you should have plenty of space to drill around the inner sleeve then use the saw to help cut the bushing around the inner sleeve to aid in differential removal.

ADVAN23 · 06-02-2021, 10:21 AM

Thanks guys! We are going to try one more extractor before I resort to Rustys solution. Ill keep everyone posted. I can't possibly be the only one with this problem.

Tractionless · 06-03-2021, 01:34 PM

Worst case, cut the mounting stud and buy a new OE cover, unless you're already doing a cover in which case you don't need the oe anyway.

05-31-2021, 08:27 PM	#3 (permalink)
jchammond A True Z Fanatic Join Date: Nov 2014 Location: South Carolina Age: 58 Posts: 15,204 Drives: 13’ 370Z TS 7A/T Rep Power: 2684395	__________________ MazWorx built long block \| FI-TT-100 Stage 2.75 \| IPT built 7A/T http://www.the370z.com/members-370z-...s-musings.html

05-31-2021, 08:33 PM	#5 (permalink)
Leingod A True Z Fanatic Join Date: Mar 2015 Location: Some Place Cold Posts: 16,060 Drives: In Circles Rep Power: 2684396	Maybe one of those butane pen torches to heat up the bolt without getting the surrounding area to hot? __________________ I AM FLOOF! SOMEBODY FLOOF MY HORN!! ALL HAIL THE FLOOF!!I JUST FLOOFED ON THE FLOOR

05-31-2021, 08:46 PM	#6 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 68 Posts: 35,271 Drives: 2011 Nismo GM 6M Rep Power: 2684438	What you may try to do. Is to cut the inner bushing with a deep hole saw. And remove it with the diff. Once out. Then you will have an easier time with it. Cut the inner shell away from the stud and nut. Hole saw https://www.homedepot.com/p/DIABLO-2...00CT/301697691 danegrey, jchammond, ZoomZ and 2 others like this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

05-31-2021, 08:50 PM	#7 (permalink)
40 to 332 Enthusiast Member Join Date: Apr 2013 Location: Kimberley, BC, CANADA Posts: 452 Drives: 13 370Z BS M6 Sport Rep Power: 439	I agree with Spooler ... not good. Working from the rear of the subframe, would it be possible to use a drill fitted with a bit or a 2" hole saw to drill out the bushing itself so that you could carefully back out the differential with what's left of the bushing still attached (... after removing the front mounting bolts of course)? At least you could then approach the problem with the differential removed from the car. I expect some shop would be able to remove the nut once the differential was out. That said, I'm not sure if there is enough room at the rear-side of the subframe to drill out the bushing. IIRC there's not a lot of space back there. ADVAN23 likes this.

06-02-2021, 10:21 AM	#11 (permalink)
ADVAN23 Base Member Join Date: Jul 2020 Location: UT Posts: 6 Drives: 09 Nissan 370Z Rep Power: 5	Thanks guys! We are going to try one more extractor before I resort to Rustys solution. Ill keep everyone posted. I can't possibly be the only one with this problem. 2011 Nismo#91, Knio and Rusty like this.

05-31-2021, 08:02 PM	#2 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,877 Drives: 2013 Nismo 370z Rep Power: 2684392	Not good. No sure what to tell you on this one.

06-03-2021, 01:34 PM	#12 (permalink)
Tractionless A True Z Fanatic Join Date: Jan 2016 Location: Atlantic SE Posts: 1,326 Drives: '10 K23 ST 7AT Rep Power: 30526	Worst case, cut the mounting stud and buy a new OE cover, unless you're already doing a cover in which case you don't need the oe anyway. __________________ Toys Not Tots