Factory Torque Specifications?

[arkenzo]

Good evening, does anyone know where to find the factory torque specifications for a 2014 Silverado LT, looking for torque specs on suspension components, installing my 2.5" rough country kit next week and would like to have it prior to installation.

 

Thank you! Will post pictures after kit is installed

[arkenzo]

Torque specs for:

 

Front Upper Strut Bolts

Front Lower Strut Bolt

Upper Ball Joint Nut

Steering Linkage Nut

Sway Bar Nut

 

Rear Lower Shock Bolts

Rear U-Bolts

 

Thanks !!!

[newdude]

Torque specs for:

specs are in red:

Front Upper Strut Bolts: 37 ft.lbs

 

Front Lower Strut Bolt: 37 ft.lbs

 

Upper Ball Joint Nut: first pass 37 ft.lbs, second pass 90-110 degrees

 

Steering Linkage Nut: first pass 26 ft.lbs second pass 85-105 degrees

 

Sway Bar Nut: 17 ft.lbs

 

Rear Lower Shock Bolts: 85 ft.lbs

 

Rear U-Bolts: first pass 59 ft.lbs, second pass 130 degrees

 

Thanks !!!

Edited November 26, 2013 by newdude

[arkenzo]

 

Torque specs for:

specs are in red:

Front Upper Strut Bolts: 37 ft.lbs

 

Front Lower Strut Bolt: 37 ft.lbs

 

Upper Ball Joint Nut: first pass 37 ft.lbs, second pass 90-110 degrees

 

Steering Linkage Nut: first pass 26 ft.lbs second pass 85-105 degrees

 

Sway Bar Nut: 17 ft.lbs

 

Rear Lower Shock Bolts: 85 ft.lbs

 

Rear U-Bolts: first pass 59 ft.lbs, second pass 130 degrees

 

Thanks !!!

 

 

Fantastic!! Thank you sir!

 

[Steelerville]

how about the top shock bolt that holds it all together.

[Greg65]

So you torque on the first pass then just rotate the appropriate degrees on the second pass,not a torque value on the second pass. Just want to clear.

[gabekalp]

So you torque on the first pass then just rotate the appropriate degrees on the second pass,not a torque value on the second pass. Just want to clear.

Correct, there are special angle torque wrenches, mainly for engine components... But for suspension its okay to eye ball it. I just torque to spec and call it a day.

 

 

Sent from my iPhone using Tapatalk

[Greg65]

Great, thanks. Doing my rough country lift in the morning and wanted to be sure.

[Greg65]

Thanks for the help guys. Was able to get my rough country 2 1/2 leveling lift kit done. Took about 4 hours by myself to do.

[jenkins12]

Correct, there are special angle torque wrenches, mainly for engine components... But for suspension its okay to eye ball it. I just torque to spec and call it a day.

 

 

Sent from my iPhone using Tapatalk

 

Please forgive my ignorance but are you saying to not worry about the "2nd Pass" degrees stuff and just ensure that I get the correct torque value? Thanks!

[smrr1]

 

Torque specs for:

specs are in red:

Front Upper Strut Bolts: 37 ft.lbs

 

Front Lower Strut Bolt: 37 ft.lbs

 

Upper Ball Joint Nut: first pass 37 ft.lbs, second pass 90-110 degrees

 

Steering Linkage Nut: first pass 26 ft.lbs second pass 85-105 degrees

 

Sway Bar Nut: 17 ft.lbs

 

Rear Lower Shock Bolts: 85 ft.lbs

 

Rear U-Bolts: first pass 59 ft.lbs, second pass 130 degrees

 

Thanks !!!

You are always on the ball and incredibly helpful. Thank you.

[gabekalp]

 

Please forgive my ignorance but are you saying to not worry about the "2nd Pass" degrees stuff and just ensure that I get the correct torque value? Thanks!

correct.. sorta how you torque your lug nuts to 140-145... a second pass isn't really needed. I would guess 90% of people don't even use a torque wrench on their u bolts

[newdude]

correct.. sorta how you torque your lug nuts to 140-145... a second pass isn't really needed. I would guess 90% of people don't even use a torque wrench on their u bolts

 

If the second pass wasn't needed then why did the manufacturer put it there? If it calls for a second or third pass, you do them and don't ignore them, whether it is a degree or torque value.

[newdude]

Some food for you's guys' thoughts from good ol' GM and their engineers:

 

The following is information regarding the proper reading of torque specifications and the re-use of fasteners.

 

The desired result of tightening a fastener is to obtain a proper clamping force between the parts. The clamping force prevents loosening when the vehicle is in use and external forces act on the clamped parts.

All fasteners have a specified torque. The method used for a particular application is determined by Engineering and specified in the Service Information. It is necessary to apply the fastener torque to the specific fastener identified. Applying torque to the mating fastener can damage the fastener, mating components or provide insufficient clamp load.

 

For example, when installing the adjust link on the 2014 Corvette rear suspension, the Service Information calls for tightening the adjust link nut to 70 N·m (52 lb. ft.), not the cam bolt.

There are three different methods for the specification of tightening fasteners: Torque (T), Torque Plus Angle (TA), and Torque Plus Angle to Yield (TAY). Torque Plus Angle to Yield (TAY) is sometimes referred to Torque To Yield (TTY).

 

A fastener specification of Torque Plus Angle (TA) — for example, 30 N·m (22 lb. ft.) + 120 degrees — has more clamping force than a fastener specification of Torque (T) — for example, 30 N·m (22 lb. ft). A fastener specification of Torque Plus Angle to Yield (TAY) has more clamping force than a fastener specification of Torque Plus Angle (TA).

 

Torque (T)

A fastener with a Torque (T) specification can be tightened with a conventional torque wrench.

Tip: Generally, externally threaded fasteners (bolts, screws, studs) tightened to this specification method can be reused, unless otherwise specified in the Service Information.

 

Torque Plus Angle (TA)

A fastener with a Torque Plus Angle (TA) specification must be tightened first to the torque part of the specification and then must be tightened further by the addition of the specified angle. The angle must be applied relative to the mating fastener, if present, or relative to the mating surface. A backup wrench must be used, if required, to prevent the rotation of the mating fastener while the angle is added to the fastener with the Torque Plus Angle (TA) specification.

 

Tip: Generally, externally threaded fasteners tightened to this specification method can be reused, unless otherwise specified in the Service Information.

 

Torque Plus Angle to Yield (TAY)

A fastener with a Torque Plus Angle to Yield specification (TAY) (as illustrated above) is tightened in the same way as the fastener with the Torque Plus Angle (TA) specification.

 

The difference between a Torque Plus Angle (TA) specification and a Torque Plus Angle to Yield (TAY) specification is the tightening results in permanent deformation of the externally threaded fastener.

 

 

Tip: Externally threaded fasteners tightened to this specification method must not be reused and must ALWAYS be replaced if loosened.

 

 

Tightening in Stages

Generally, Service Information specifies a fastener tightening specification in stages. An individual fastener with a Torque (T) specification is tightened to the specified torque in one pass.

For Torque Plus Angle (TA) and Torque Plus Angle to Yield (TAY) specification fasteners, the fasteners are tightened in stages. All the fasteners are tightened to a torque specification on the first pass. Next, they receive another tightening to a specified angle (in degrees) on the second pass. Sometimes, more than two passes are required. Always refer to the appropriate Service Information for proper tightening in stages.

 

On applications with more than one fastener, such as wheel nuts or cylinder head bolts, the fasteners should be tightened to specification by alternating between the fasteners to ensure the parts are not distorted and that the fasteners are torqued evenly. Once a specified minimum of torque has been achieved for each bolt, the bolts should be tightened completely to specification.

 

Reusing the Fastener

Think of an externally threaded fastener (bolt, screw or stud) as a spring. As a Torque (T) or Torque Plus Angle (TA) tightening specification is applied, the spring (externally threaded fastener) is stretched. With a Torque (T) or Torque Plus Angle (TA) tightening specification, the spring returns to its original length (elastically stretched) when loosened. In the case of a Torque Plus Angle to Yield (TAY) tightening specification, the spring is overstretched (plastically deformed) and does not return to its original length. For this reason, the Torque Plus Angle to Yield (TAY) tightening specification requires the externally threaded fastener to ALWAYS be replaced.

 

In the Service Information, the following warning will be shown when a Torque Plus Angle to Yield (TAY) specification fastener is used:

Warning: This vehicle is equipped with torque-to-yield or single use fasteners. Install a NEW torque-to-yield or single use fastener when installing this component. Failure to replace the torque-to-yield or single use fasteners could cause damage to the vehicle, component, or bodily injury.

 

Tip: There is no effect to the object in which the externally threaded fastener is threaded. It can be either a nut or a threaded hole in a component. If a nut is present, it can be reused.

 

Why Do Engines Specify TA or TAY Torque Specifications

With the added benefit of increased clamping force, a smaller fastener can be used when a Torque Plus Angle (TA) or Torque Plus Angle to Yield (TAY) tightening specification is quantified. For example, an M12 size bolt with a Torque Plus Angle to Yield (TAY) specification can be used in place of an M16 size bolt with a Torque (T) specification. The use of Torque Plus Angle (TA) and Torque Plus Angle to Yield (TAY) specifications result in a reduction in the vehicle weight and, therefore, improved fuel economy.

 

 

[gabekalp]

 

If the second pass wasn't needed then why did the manufacturer put it there? If it calls for a second or third pass, you do them and don't ignore them, whether it is a degree or torque value.

alrighty, well have fun buying a $900 tool to fasten your u bolts, ill stick to my general conscious ;)