It is recommended to remove the rocker shaft evenly, a few turns on the nuts
and bolts at a time to prevent bending of the shaft ( I never do, that's
what is recommended), leave the two bolts in the ends, it will prevent the
shaft and rocker assembly from coming apart, also on reassembly, there is a
mount with an oil passage, the center one, make sure that it is not forced
into the hole and that the "O" ring is still attached. Now this wouldn't be
necessary if we could get the proper tool to retorque the head bolts without
removing the rocker shaft, an apprentice broke mine.
----- Original Message -----
From: "Brian Rodgers" <brians.outfit@gmail.com>
To: <peugeot-L@yahoogroups.com>
Sent: Monday, April 17, 2006 5:10 PM
Subject: [Peugeot-L] TTY bolts, was: 505 Diesel radiators & heater core
by-pass
> XD2S engine
> I am about to remove the rocker arm to get to the head bolts.
> Any takers on the question about the rocker arm removal? It looks like the
> two bolts at each end come off, also the studs? Any order for removal?
> Thanks
>
> Brian Rodgers
> On 4/17/06, Brian Rodgers <brians.outfit@gmail.com> wrote:
>>
>> 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
>> >
>> --
>> 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
>>
>
>
>
> --
> 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]
>
>
>
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Received on Mon Apr 17 15:38:05 2006
