Date: Tue, 24 Mar 2015 09:45:09 -0700
Reply-To: "sailingfc @dslextreme.com" <sailingfc@DSLEXTREME.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: "sailingfc @dslextreme.com" <sailingfc@DSLEXTREME.COM>
Subject: Re: Torque wrenches
In-Reply-To: <BAY405-EAS2573838F9BD14D524CBD3CCA00D0@phx.gbl>
Content-Type: text/plain; charset=ISO-8859-1
Double checked with Bentley: Rear CV bolts are 33 lb-ft, but front CV bolts
are 26 lb-ft. Strange that they would be different.
-Dick-
On Mon, Mar 23, 2015 at 2:46 PM, Dennis Haynes <d23haynes57@hotmail.com>
wrote:
> When it comes to using torque wrenches there are a number of factors that
> need to be considered for successful use.
> There is some skill involved in using one including the clicker type. The
> fastener and mating parts need to be prepped for the application. Torque
> wrenches are precision tools and especially the clicker types need to be
> properly used and stored. Regular calibration is required for critical work
> such as head assemblies and connecting rods. The goal is to achieve the
> proper clamping load for the assembly.
>
> Torque should be applied smooth and steady, apply the torque and hold as
> long as the fastener continues to turn.
> Never use a torque wrench to "break" or loosen a fastener. For the big
> stuff
> that is why there are breaker bars.
> When finished always lower the setting on the wrench so that the spring is
> relaxed.
> When prepping a fastener consider the lubrication and why! Some lubricants
> can require torque to be reduced by as much as 40%. Do not use anti-seize
> of
> wheel lugs.
> Vibration is not the cause of fasteners coming loose. Yes it can make them
> fall off afterwards. Loose fasteners are the result of a connection that
> could not sustain the clamp load. Some solid lubricants can make for a
> loose
> connection as it fills gaps that can work out leaving space making that
> connection loose. Anti-Seize on the taper of a lug nut!
>
> CV joints man I have seen my share of those come loose. This is acritical
> application. Both the shear forces on the bolts and friction between the
> joint and flange help to hold this together. Avoid that moly grease between
> the joint and the flange. Use new bolts and check that they are of quality.
> I have been getting some that junk in the kits. They just keep stretching.
> All hardware should be marked with the grade, (property class) and
> manufacturer. If buying bolts for this job look for P.C. 12.9.
>
> When selecting fasteners, nuts, bolts, and washers need to be matched. No
> sense having strong bolts if the washers dish out letting the connection
> come loose.
>
> Hope some of this helps.
>
> Dennis
>
|