Re-Using Torque to Yield Bolts? - Page 2 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

2012LS3VERT · 01-05-2015, 11:21 PM

I generally replace the caliper bolts every second use. The subframe bolts, it won't hurt to change them, but in general they are only removed and reinstalled once during the life of the car. During development of our subframe bushings, I already had my bushings replaced with poly, and then a cosmetically damaged set of Pfadt - style solids, so the last time I changed them I replaced the bolts. All others, I generally re-use.

Nighthawk89 · 01-06-2015, 12:05 AM

Quote:

Originally Posted by 2012LS3VERT

I generally replace the caliper bolts every second use. The subframe bolts, it won't hurt to change them, but in general they are only removed and reinstalled once during the life of the car. During development of our subframe bushings, I already had my bushings replaced with poly, and then a cosmetically damaged set of Pfadt - style solids, so the last time I changed them I replaced the bolts. All others, I generally re-use.

Yeah Maureen offered up a price i couldn't deny so i bought the calipers and the subframe bolts. I figure i wont put the caliper one on this go around. Ill get everything done and once i buy the new calipers and have mike powdercoat them ill use them then.

wakespeak · 02-21-2017, 10:44 PM

Digging this thread up again. GM makes a distinction between torque plus angle and torque plug angle to yield. The torque plus angle bolts can be reused. Looking at the 1LE track pack install instructions, I see no reference to torque plus angle to yield warnings.

See this reference.

hesster · 02-22-2017, 08:35 AM

Here is a list of the TTY's (ref - this list is for a 2010). You can reuse them a few times, at your own risk. All can be purchased from GM Parts Direct or GM Parts Giant.

Fondue Wormhole · 02-22-2017, 09:34 AM

First, a true TTY bolt, that has been torqued-to-yield, should absolutely only be used once... A TTY bolt, that hasn't been torqued-to-yield, can be re-used just like a non-TTY bolt.

Where did you find that list, and what does green designate?

JusticePete · 02-22-2017, 11:27 AM

GM caliper bolts have been TTY for 20 years or more. I have been in a lot of GM repair facilities and I have never seen a GM tech use new caliper bolts. That doesn't make it right though.

Always replace a TTY bolt with a new TTY bolt if they are available. If not, LocTite becomes your best option and friend.

KillboyPowerhead · 02-22-2017, 11:50 AM

Quote:

Originally Posted by JusticePete

GM caliper bolts have been TTY for 20 years or more. I have been in a lot of GM repair facilities and I have never seen a GM tech use new caliper bolts. That doesn't make it right though.

Is this due to lack of knowledge? Unnecessity (if this isn't a word it is now)? Laziness? Just wondering.

JusticePete · 02-22-2017, 11:52 AM

Quote:

Originally Posted by KillboyPowerhead

Is this due to lack of knowledge? Unnecessity (if this isn't a word it is now)? Laziness? Just wondering.

Tribal Knowledge would be my explanation. This is the way we have always done it.

wakespeak · 02-22-2017, 06:09 PM

AS a follow up, the link in my post above goes to an ACDelco TechConnect article. Excerpt:

In GM Service Information, the
following warning will be shown when
a Torque Plus Angle to Yield (TAY)
specification fastener is used:
Torque-to-Yield Fastener Warning
(2406051)
Caution: This vehicle is equipped
with torque-to-yield or single use
fasteners. Install a NEW torque-toyield
or single use fastener when
installing this component. Failure to
replace the torque-to-yield or single
use fastener could cause damage to
the vehicle or component.

I see none of this in the 1LE Track pack install instructions for the Gen-V cars. There is one place, when replacing the driveshaft bolts, where it says to use new bolts. Also a few references to new nuts.

HOWEVER, that verbage all over the place for the 2017 Track Pack Instructions. So I am assuming the Gen-V cars use torque plus angle, not torque plus angle to yield. Comments?

hesster · 02-23-2017, 07:19 AM

I made the list when documenting the build of my ride. I researched the listed GM Parts websites to obtain and order the correct bolts, and all were correct when I did my build last year. The colors do not have any significance. To me, it was cheap insurance to buy all new fasteners - peace of mind for $175.

02-21-2017, 10:44 PM	#17
wakespeak Drives: 2020 ZL1 1LE Join Date: Sep 2012 Location: Austin, Texas Posts: 1,390	Digging this thread up again. GM makes a distinction between torque plus angle and torque plug angle to yield. The torque plus angle bolts can be reused. Looking at the 1LE track pack install instructions, I see no reference to torque plus angle to yield warnings. See this reference. __________________ 2020 ZL1 1LE [Moroso SC Expansion Tank, otherwise stock]

02-22-2017, 06:09 PM	#23
wakespeak Drives: 2020 ZL1 1LE Join Date: Sep 2012 Location: Austin, Texas Posts: 1,390	AS a follow up, the link in my post above goes to an ACDelco TechConnect article. Excerpt: In GM Service Information, the following warning will be shown when a Torque Plus Angle to Yield (TAY) specification fastener is used: Torque-to-Yield Fastener Warning (2406051) Caution: This vehicle is equipped with torque-to-yield or single use fasteners. Install a NEW torque-toyield or single use fastener when installing this component. Failure to replace the torque-to-yield or single use fastener could cause damage to the vehicle or component. I see none of this in the 1LE Track pack install instructions for the Gen-V cars. There is one place, when replacing the driveshaft bolts, where it says to use new bolts. Also a few references to new nuts. HOWEVER, that verbage all over the place for the 2017 Track Pack Instructions. So I am assuming the Gen-V cars use torque plus angle, not torque plus angle to yield. Comments? __________________ 2020 ZL1 1LE [Moroso SC Expansion Tank, otherwise stock]

01-05-2015, 11:21 PM	#15
2012LS3VERT Drives: 2012 2SSRS Vert, Black w/M6 Join Date: Jan 2013 Location: Montgomery, AL Posts: 1,265	I generally replace the caliper bolts every second use. The subframe bolts, it won't hurt to change them, but in general they are only removed and reinstalled once during the life of the car. During development of our subframe bushings, I already had my bushings replaced with poly, and then a cosmetically damaged set of Pfadt - style solids, so the last time I changed them I replaced the bolts. All others, I generally re-use.

02-22-2017, 08:35 AM	#18
hesster Drives: '10 T/A Conv, '10 2SS, '77 SE T/A Join Date: Dec 2015 Location: Michigan Posts: 894 View My Garage	Here is a list of the TTY's (ref - this list is for a 2010). You can reuse them a few times, at your own risk. All can be purchased from GM Parts Direct or GM Parts Giant.

02-22-2017, 09:34 AM	#19
Fondue Wormhole Bad Example Drives: Camaro SS Join Date: Apr 2016 Location: 91311 Posts: 124	First, a true TTY bolt, that has been torqued-to-yield, should absolutely only be used once... A TTY bolt, that hasn't been torqued-to-yield, can be re-used just like a non-TTY bolt. Where did you find that list, and what does green designate?

02-22-2017, 11:27 AM	#20
JusticePete Drives: Camaro Justice Join Date: Jun 2007 Location: Virginia Posts: 20,171	GM caliper bolts have been TTY for 20 years or more. I have been in a lot of GM repair facilities and I have never seen a GM tech use new caliper bolts. That doesn't make it right though. Always replace a TTY bolt with a new TTY bolt if they are available. If not, LocTite becomes your best option and friend.

02-23-2017, 07:19 AM	#24
hesster Drives: '10 T/A Conv, '10 2SS, '77 SE T/A Join Date: Dec 2015 Location: Michigan Posts: 894 View My Garage	I made the list when documenting the build of my ride. I researched the listed GM Parts websites to obtain and order the correct bolts, and all were correct when I did my build last year. The colors do not have any significance. To me, it was cheap insurance to buy all new fasteners - peace of mind for $175.