[Peugeot-L] TTY bolts, was: 505 Diesel radiators & heater core by-pass

In the book it mentions yellow headed or shouldered bolts and goes on to give torques for either. I am lost. How do I identify whether the bolt is shouldered if I haven't taken them out to look at the shaft? On top of this I see no indication of color. Is 'TTY' stamped on the bolt head? There is a section on identifying which head is on the block, but this too seems work for a head which is off. The last couple of head repairs I have done did not work out very well for me so I am leery of removing the head. I now have the valve cover off and can see that the rocker arm needs to be removed. Is there anything I should know about this? I'd hate to get it off only to find out the bolts are not reusable. The engine runs, if you know what I mean. I want to keep it that way. Anyway I see the pattern in the book to torque the bolts but I'm unclear what to torque them to. Also, in the book it says after torque loosen them 90 degrees? I thought you were saying to tighten them a half turn more after torque.
Thank you so much
Brian Rodgers

On 4/17/06, Brian Holm <peugeots@vtlink.net> wrote:
>
> Con
>
> Peugeot says you can reuse the TTY bolts up to five times. The
> recommended tightening procedure should not deform the bolts
> plastically. They should return to their normal length upon
> removal. Of course they should be checked to be sure, and any that
> are too long discarded. They are now obscenely expensive if bought
> separately from Peugeot, not so bad if bought as a set with the head
> gasket.
>
> Brian Holm
>
> At 07:43 AM 4/17/2006, con wrote:
>
> >I'll try to remember basic metallurgy.
> >
> >"Torque to yield" bolts (if torqued to specification) cannot be reused
> >because they have been stretched beyond their "elastic" region, into
> what's
> >called "plastic" region: Elastic means that they return to their original
> >length. Once stretched into the "plastic" region they stay elongated and
> >hence new bolts are required.
> >
> >Con,,,,
> >
> >
>
> Brian Holm, Parts for Peugeots
> at Peugeot Holm, since 1969
> 2120 Maple Hill
> Plainfield, VT, 05667
> 802-454-7132, fax -1310
>
>
> --
> No virus found in this outgoing message.
> Checked by AVG Anti-Virus.
> Version: 7.1.385 / Virus Database: 268.4.2/314 - Release Date: 4/16/2006
>
>
>
>
> Recommended format for your email subject lines:
> Model # [Model Letters] Year Subject
>
> Examples:
> 505 88 V6 Mileage
> 405 Mi16 89 Ignition Coil source?
> ************************************************
> To unsubscribe from this list send a blank email message to
> PEUGEOT-L-UNSUBSCRIBE@EGROUPS.COM
> ************************************************
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>

--
High tech in the wild wild west.
www.outfitnm.com
Our cool old machines:
1981 Peugeot 505s TD
1974 Mercedes 250
1974 BMW Bavaria
1956 International Utility 460 Tractor


[Non-text portions of this message have been removed]



Recommended format for your email subject lines:
Model # [Model Letters] Year Subject

Examples:
505 88 V6 Mileage
405 Mi16 89 Ignition Coil source?
************************************************
To unsubscribe from this list send a blank email message to PEUGEOT-L-UNSUBSCRIBE@EGROUPS.COM
************************************************
 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/peugeot-L/

<*> To unsubscribe from this group, send an email to:
    peugeot-L-unsubscribe@yahoogroups.com

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/