On Wed, December 21, 2005 4:35 pm, jon@dakota-truck.net wrote:
>
> "Josh Battles" <josh.lists@omg-stfu.com> wrote:
> : On Tue, December 20, 2005 1:08 pm, jon@dakota-truck.net wrote:
> :>
> :> The Magnum engines use a torque to yield bolt for the intake, so they
> :> will stretch when torqued down. When they have been torqued down once,
> :> they have stretched all they are supposed to, so you shouldn't re-use
> :> them. Interestingly, the head bolts are also torque to yeild, however
> :> you are allowed to re-use those once. (The procedure that is supposed
> :> to be followed is a dab of paint should be put on the head of any head
> :> bolt which is re-used, that way the next guy who pulls the heads knows
> :> not to re-use them.) Anyhoo, bit of a digression there. :-) The intake
> :> bolts should only be used once, and in fact the gasket kit that you
> :> will need to get at the dealership for the side, front and rear gaskets
> :> will include new intake bolts.
>
> : Cool. So do I need to use a torque wrench on the bolts then or not because
> : they're torque to yield? I guess I'm looking for more information on how
> : these fasteners work
>
>
> Yep, torquing them to the correct value will ensure the proper amount
> of stretch. The bolts need to be streched a certain amount, and without
> a torque wrench, you're likely to either not strech them enough or too
> much. The values given in the FSM have been determined to produce the
> proper amount of stretch. Some torque to yield fasteners are supposed
> to be torqued to a certain value and then turned a certain number of
> degrees beyond that torque to produce the stretch, but in the case of
> the intake manifold bolts, you just torque them to the final value
> (in 3 stages, IIRC.)
Gotcha. It's in 3 stages, the FSM is pretty detailed about it.
-- - Josh www.omg-stfu.com
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