This has been a most interesting string. I will be putting the head back on my
late
block TR6 next weekend using a teflon coated gasket. Will use the "take your
time
between cycles" approach. Would never have thought to do it without the list!
I do
plan to break in the new cam for twenty minutes or so, then retorque hot also.
Thanks,
Chuck
Susan and Jack Brooks wrote:
> FOT,
>
> As with Michael, I found that time alone allowed for additional torquing with
> composite gaskets. I first discovered this with my Norton motorcycle. The
> "flame ring" gasket at the bottom of the jugs (cylinders) compressed
>overnight.
> If you didn't wait, and installed the head, there was no going back to
>retighten
> it. The next day, significant retightening was required. Waiting one more day
> provided little or no further tightening.
>
> When I installed composite gaskets in my TR3, I retightened the next day,
> without needing to loosen first. I also retorque hot immediately and retorque
> cold 500 miles later.
>
> Jack Brooks
>
> >As for the use of composite or composite sandwich gaskets, I've
> >developed a procedure over the years that seems to minimize problems if
> >the head isn't immediately retorqued, and it seems to work, since I
> >haven't had any head gaskets fail. On initial torque, I take plenty of
> >time between cycles of increasing torque, usually fifteen minutes or
> >more. If torque would be normally split in four cycles, I let perhaps
> >ten-fifteen minutes go by between each. That allows for progressive
> >compression of composite gaskets. On the last go-round, I wait maybe
> >thirty minutes and then do a last check to specified torque. This also
> >helps greatly with used studs and nuts--if one stud or nut is failing
> >because it's yielded, that shows up as a loose nut on final torque
> >check. All this extra time gives composite gaskets more time to relax.
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