RE: [Peugeot-L] 505 Diesel radiators & heater core by-pass

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,,,,  

1979 504GL

1984 505 STi

1998 406 SV      

From: peugeot-L@yahoogroups.com [mailto:peugeot-L@yahoogroups.com] On Behalf Of Mike Aube
Sent: Monday, April 17, 2006 7:47 AM
To: peugeot-L@yahoogroups.com
Subject: Re: [Peugeot-L] 505 Diesel radiators & heater core by-pass  

Torque to yield head bolts are where you torque the head bolt ( most are around 30lbs/ft) then give it another 90 deg (+ another 90 on the 405) rotation to stretch the bolt to constant pressure. Probably clear as mud. ----- Original Message -----
From: "Brian Rodgers" <brians.outfit@gmail.com> To: <peugeot-L@yahoogroups.com>
Sent: Sunday, April 16, 2006 4:38 PM
Subject: [Peugeot-L] 505 Diesel radiators & heater core by-pass

> Sweet, I still have it in the garage. Now that I know better how to pull
> the
> valve cover I might do the head torque right now. Afterward I will check
> the
> valve adjustment again. For now I replaced the heater hose leaving it to
> bypass the core. What do you mean by "not torque to yield"?
> Actually this is very encouraging. I think I will go do the torque right
> now, anything to keep from pulling the head.
> Thanks
> BrianRodgers
>
> On 4/16/06, Mike Aube <maube@idirect.com> wrote:
>>
>> Darn, I had forgotten that you had mentioned that. Should have suggested
>> that you retorque the head before doing the valve adjustment. The head
>> bolts
>> on the 81/82 are not torque to yield and sometimes loosen up enough to
>> let
>> some gas through to the cooling system. A retorque, when caught on time,
>> cures that.

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