Hi List!
I have a U20 that was rebuilt by a local shop about 2
years and 1500 miles ago. I asked the shop about
re-torqueing the head and they said it doesn't need it
- something about new technology bolts and gaskets.
Greg on the list (gregs672liter) and I were talking
about other subjects and the topic of retorqueing came
up, and he recommended sending a query out to the
list. So...
What are your thoughts on retorqueing a U20 head after
a rebuild?
If retorqueing is advised, what is the best method:
1) slightly loosening and retorqueing each bolt, one
at a time? If so do you start from the center and
working out like the manual shows for torqueing?
2) loosen all the bolts slightly starting in reverse
order from the manual, and then retorqueing from the
center and working out like the manual shows for
torqueing?
I have heard both methods and just want to know what
the list thinks is the best.
Thanks all!
Scott Occhiuto.
--- gregs672liter@netzero.net wrote:
> Date: Sat, 20 Mar 2004 07:33:28 GMT
> To: calabria1922@yahoo.com
> Subject: Re: I'm baaack!
> From: gregs672liter@netzero.net
>
>
> Well, I have not heard either way, however, I guess
> the point is to make sure the bolt is torqued to
> spec after things have run through several heat
> cycles, so just losening and retorqueing one at a
> time does make sense. My understanding when it
> comes to tension on the head is that you want the
> tension to exit out the ends. If you loosen the
> middle first, then the head has a chance to arch up
> in the middle like a banana. I guess that is why
> when I do a retorque I have always started loosening
> from the ends and working in. As I think about it,
> I doubt you could really break the seal that easily
> on the gasket... as I recall I have frequently had
> to rock the head a lot just to get it off with all
> the bolts out. So, if it were me doing it (and I
> have), I would back each one out a turn, starting at
> the ends, then retorque starting from the middle as
> you laid out before. However, that is just me...
> others on the list may know better! Sorry for any
> confusion!
> Greg
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