Broken Bolts changing control arm! - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Le86 · 10-28-2012, 12:59 AM

That should be a pretty standard bolt. I'm willing to bet many auto parts/fastener stores will carry it. Just measure the thread pitch if you haven't already or just take the other bolt in and have them match it up. Might as well replaced the slightly stripped one anyways, right?

FirestormFRS · 10-28-2012, 06:52 PM

Given that breaking torque of OEM bolts are generally twice the torque spec I think someone put the wrong bolts in that arm.

benlevy3 · 10-29-2012, 12:23 PM

I replaced the bots with brand new Toyota bolts.

The new one also stripped the threads!

After taking a very close look at it, the new control arms have a slight curve to them. I think that when the nut is being tightened, there is pressure on one side of it. I think that is what is making the threads strip. The torque setting seems extremely high for a fine thread bolt like that. 96 foot pounds.

GTM_Challenge · 10-29-2012, 01:00 PM

Quote:

Originally Posted by benlevy3

I replaced the bots with brand new Toyota bolts.

The new one also stripped the threads!

After taking a very close look at it, the new control arms have a slight curve to them. I think that when the nut is being tightened, there is pressure on one side of it. I think that is what is making the threads strip. The torque setting seems extremely high for a fine thread bolt like that. 96 foot pounds.

If I recall correctly, its something like 87 ft lbs on a similar bolt for the s2000.

deucethemoose · 10-29-2012, 01:03 PM

Quote:

Originally Posted by benlevy3

I replaced the bots with brand new Toyota bolts.

The new one also stripped the threads!

After taking a very close look at it, the new control arms have a slight curve to them. I think that when the nut is being tightened, there is pressure on one side of it. I think that is what is making the threads strip. The torque setting seems extremely high for a fine thread bolt like that. 96 foot pounds.

Dude, just go buy a coarse thread grade 10 bolt and nylon lock nut from the hardware store.

celica73 · 10-29-2012, 01:10 PM

what brand control arms?

hippari · 10-29-2012, 02:27 PM

Quote:

Originally Posted by celica73

what brand control arms?

^This

benlevy3 · 10-29-2012, 03:23 PM

Quote:

Originally Posted by deucethemoose

Dude, just go buy a coarse thread grade 10 bolt and nylon lock nut from the hardware store.

Done! Fastnall!

SPC Rear Control Arms: http://ft86speedfactory.com/spc-rear...-arms-436.html

These are the same part number as the WRX control arms.

JoeBoxer · 10-29-2012, 04:07 PM

No issue stripping the bolts when i put my SPC's on.

10-28-2012, 12:59 AM	#15
Le86 Senior Member Join Date: Sep 2012 Drives: Asphalt FR-S Location: PNW Posts: 144 Thanks: 11 Thanked 19 Times in 13 Posts Mentioned: 2 Post(s)	That should be a pretty standard bolt. I'm willing to bet many auto parts/fastener stores will carry it. Just measure the thread pitch if you haven't already or just take the other bolt in and have them match it up. Might as well replaced the slightly stripped one anyways, right? __________________ 10/01/2012 FR-S down for P0019 code. Received vehicle back from dealership with a new ECU 10/30/2012

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10-28-2012, 06:52 PM	#16
FirestormFRS Senior Member Join Date: Jul 2012 Drives: 2013 FR-S Location: Anytown Posts: 920 Thanks: 73 Thanked 643 Times in 302 Posts Mentioned: 3 Post(s)	Given that breaking torque of OEM bolts are generally twice the torque spec I think someone put the wrong bolts in that arm.

10-29-2012, 12:23 PM	#17
benlevy3 Member Join Date: Sep 2012 Drives: FRS Location: Houston, TX Posts: 42 Thanks: 0 Thanked 6 Times in 5 Posts Mentioned: 0 Post(s)	I replaced the bots with brand new Toyota bolts. The new one also stripped the threads! After taking a very close look at it, the new control arms have a slight curve to them. I think that when the nut is being tightened, there is pressure on one side of it. I think that is what is making the threads strip. The torque setting seems extremely high for a fine thread bolt like that. 96 foot pounds.

10-29-2012, 01:10 PM	#20
celica73 Senior Member Join Date: Jun 2012 Drives: '13 BRZ / '11 Outback / '06 Tundra Location: Durham NC Posts: 510 Thanks: 6 Thanked 155 Times in 104 Posts Mentioned: 4 Post(s)	what brand control arms?

10-29-2012, 04:07 PM	#23
JoeBoxer Senior Member Join Date: Jul 2012 Drives: Whiteout FR-S Location: Arkansas Posts: 4,154 Thanks: 1,666 Thanked 1,627 Times in 997 Posts Mentioned: 72 Post(s)	No issue stripping the bolts when i put my SPC's on.

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