[Z06] Tightening Axle bolts - Instructions?
02-17-2011, 10:58 PM
#2
Race Director
Well.....below is the TSB. It only goes up through the 2008 model year - I don't know whether GM updated it to include later years or not, but obviously we're still having the problem. I know I did on my 2009!!
In the TSB you'll read that you are supposed to use a new nut (I bold-faced that info below). There is info about this in many other threads in the forum, and the wisdom is that a new nut is required because, I think, of something to do with the face of the nut and the way it deforms under the torque load.
Also, the TSB referenced below has a 160 lb-ft torque spec, however most people feel that's way too much, and other versions of the TSB have various specs, and I think a more current one is 140 lb-ft.
My 2006 Service Manual says 118 lb-ft, and my 2010 SM says 151 lb-ft and doesn't have any mention of using a new nut, so you'll find torque specs all over the place!!!
Anyway, when I checked my '09 nuts and found the right side loose, I just tightened it up to 140 lb-ft. I've done that on all 3 of the C6's I've owned - never used a new nut and never had further problems, but YMMV!
Bob
Document ID# 2018487
2005 Chevrolet Corvette
--------------------------------------------------------------------------------
Subject: Tapping or Scraping Noise From Rear Wheel Area (Replace Wheel Drive Shaft Nut) #07-04-95-001 - (09/26/2007)
Models: 2005-2008 Cadillac XLR
2005-2008 Chevrolet Corvette
--------------------------------------------------------------------------------
Condition
Some customers may comment on a tapping or a scraping noise coming from the rear wheel area.
Cause
This condition may be due to the torque on the wheel drive shaft nut relaxing over time.
Correction
Replace the left and the right wheel drive shaft nut following the procedure below.
Remove the center cap from the rim.
Remove and discard the wheel drive shaft nut.
Apply LOCTITE™ 272, or equivalent, to the threads of the axle shaft.
Install the nut and tighten to the new specification.
Tighten
Tighten the nut to 215 N·m (160 lb ft).
Install the center cap to the rim.
Important: The vehicle should not be driven for 24 hours following the repair in order to allow the thread lock to cure.
Parts Information
Part Number
Description
Qty
10257766
Nut
2 (one per side)
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation
Description
Labor Time
F9712*
Wheel Drive Shaft Nut - Replace
0.3 hr
*This is a unique labor operation for bulletin use only. It will not be published in the Labor Time Guide.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION
© Copyright General Motors Corporation. All Rights Reserved.
--------------------------------------------------------------------------------
Document ID# 2018487
2005 Chevrolet Corvette
In the TSB you'll read that you are supposed to use a new nut (I bold-faced that info below). There is info about this in many other threads in the forum, and the wisdom is that a new nut is required because, I think, of something to do with the face of the nut and the way it deforms under the torque load.
Also, the TSB referenced below has a 160 lb-ft torque spec, however most people feel that's way too much, and other versions of the TSB have various specs, and I think a more current one is 140 lb-ft.
My 2006 Service Manual says 118 lb-ft, and my 2010 SM says 151 lb-ft and doesn't have any mention of using a new nut, so you'll find torque specs all over the place!!!
Anyway, when I checked my '09 nuts and found the right side loose, I just tightened it up to 140 lb-ft. I've done that on all 3 of the C6's I've owned - never used a new nut and never had further problems, but YMMV!
Bob
Document ID# 2018487
2005 Chevrolet Corvette
--------------------------------------------------------------------------------
Subject: Tapping or Scraping Noise From Rear Wheel Area (Replace Wheel Drive Shaft Nut) #07-04-95-001 - (09/26/2007)
Models: 2005-2008 Cadillac XLR
2005-2008 Chevrolet Corvette
--------------------------------------------------------------------------------
Condition
Some customers may comment on a tapping or a scraping noise coming from the rear wheel area.
Cause
This condition may be due to the torque on the wheel drive shaft nut relaxing over time.
Correction
Replace the left and the right wheel drive shaft nut following the procedure below.
Remove the center cap from the rim.
Remove and discard the wheel drive shaft nut.
Apply LOCTITE™ 272, or equivalent, to the threads of the axle shaft.
Install the nut and tighten to the new specification.
Tighten
Tighten the nut to 215 N·m (160 lb ft).
Install the center cap to the rim.
Important: The vehicle should not be driven for 24 hours following the repair in order to allow the thread lock to cure.
Parts Information
Part Number
Description
Qty
10257766
Nut
2 (one per side)
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation
Description
Labor Time
F9712*
Wheel Drive Shaft Nut - Replace
0.3 hr
*This is a unique labor operation for bulletin use only. It will not be published in the Labor Time Guide.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION
© Copyright General Motors Corporation. All Rights Reserved.
--------------------------------------------------------------------------------
Document ID# 2018487
2005 Chevrolet Corvette
02-18-2011, 05:46 AM
#3
Race Director
Member Since: Aug 2000
Location: Central Florida
Posts: 10,649
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Before making passes at drag strip rentals or events, our routine is to verify the rear axle nut torque of each Corvette attending in the group.
Any of these three sockets will fit: 33mm, 34mm, 1-5/16 SAE. If you need to buy one, get the 33mm. Available at Sears, AutoZone, etc.
We've been using the original nuts, torquing to 160. It's very rare, in the cars I've checked, for the nuts to come loose again after being properly torqued the first time.
On my car, I followed the original TSB and used lock-tite (blue) and a 118 torque setting. And more than 250 passes later, the axle nuts have not come loose.
No need to jack up the car. The torque setting can be applied with the tires burdened.
Ranger
Any of these three sockets will fit: 33mm, 34mm, 1-5/16 SAE. If you need to buy one, get the 33mm. Available at Sears, AutoZone, etc.
We've been using the original nuts, torquing to 160. It's very rare, in the cars I've checked, for the nuts to come loose again after being properly torqued the first time.
On my car, I followed the original TSB and used lock-tite (blue) and a 118 torque setting. And more than 250 passes later, the axle nuts have not come loose.
No need to jack up the car. The torque setting can be applied with the tires burdened.
Ranger
02-18-2011, 02:03 PM
#6
Le Mans Master
I know there's an elaborate TSB on this, but before GM issued it, picked up a 34mm socket and torqued them to 130 ft/lbs a few time's and never came loose since. I do road track my car several time's a year, and check them when swapping rubber, but no further problem's.
02-18-2011, 03:25 PM
#7
The Consigliere
Member Since: May 2006
Location: 2023 Z06 & 2010 ZR1
Posts: 22,273
Received 5,466 Likes
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2,276 Posts
I'm probably a bit ****, but I checked/verified torque of axle nuts on both my C6s and then double-nutted them. There is room under the wheel to double-nutt the axles. That way I don't have to worry about them backing off.
