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Re: [GMCnet] Black List call [message #261569 is a reply to message #261566] Thu, 11 September 2014 08:12 Go to previous messageGo to previous message
Jim Miller is currently offline  Jim Miller   United States
Messages: 501
Registered: March 2008
Karma:
Senior Member
Safety wire is not intended to maintain torque on a fastener; it is used to prevent the LOSS of a fastener in a safety-of-life application such as in the prop bolts you refer to. Safety wire IS sufficient to keep your prop bolts in their holes long enough for you to get on the ground and take your aircraft to an A&P who can find out why you have high vibes coming from the engine and prop system.

...however we are not talking about aircraft, we are talking about the GMC.

The CV/final drive assembly is utterly dependent on clamping force between the flange faces to prevent differential motion between the two halves - and this clamping force is directly dependent on the bolt torque. Many people are reluctant to tighten these "little" bolts to the lightyear-megaton torque value that is required for proper functioning of the assembly - or they refuse to use new fasteners each time as required by the GM service manual. If these bolts loosen even a slight amount - to the point where differential motion starts to occur - then it will be only a short amount of time before the threaded holes in the driving flange will be elongated to a point where the fasteners can never again maintain proper torque on their own. You do NOT want that to happen!

Using safety wire on the bolts in question will NOT keep them tightened to the proper torque...however it WILL do a very good job of preventing you from discovering that the bolts have loosened and, as such, are allowing your driving flange's threaded holes to be battered on each acceleration/deceleration cycle of the vehicle.

If you are really worried about this situation then get under the vehicle with a torque wrench and check the torque on each bolt in each flange on a regular basis. After all, that is the approach taken in the aviation industry...

On the other hand, if your CV flanges are already battered due to improper assembly by some mechanic in the past then all bets are off.

--Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH

On Sep 11, 2014, at 7:54 AM, Robin Geralds wrote:

> Does anyone sell or has anyone tried finding the correct rated/sized bolts with a safety wire hole so that the bolts can be paired up and saftey wired
> like prop bolts? If these cannot stay tight, it might be worth it for piece of mind. Something I will consider when I get to be mobile again.
> Rob
> --
> 74 GMC with rod saying hi
> Grand Junction, CO
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> GMCnet mailing list
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Jim Miller 1977 Eleganza II 1977 Royale Hamilton, OH

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