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Thanks for the update, Alan. Good Luck!
Bob
On 2/2/2021 6:01 PM, Alan Seigrist wrote:
> Hi Bob -
>
> This gasket was put on the car only about 5K miles ago if you can
> believe it, but the car sat for about 10 years afterwards... I've
> checked both the head and deck with a rectifier (see pic), both are
> very nicely flat and do not need to go to the machinist. Both are
> flat to within 1/1000 on the surface... which is less than the error
> on the rectifier!
>
> I have the previously removed very old copper gasket which I saved and
> it has no signs of gas leaking between cylinders compared to this
> newer gasket that I just removed. I discovered a few things:
>
> 1. The old gasket is made with better quality, softer copper, and is
> thicker than the newer gasket that was put on. The old gasket
> that showed no problems is 1.8mm thick after being installed, the
> new gasket that failed is 1.5mm thick after being installed. The
> old gasket is very nicely marked as to orientation, directions,
> copper compression rings are thicker, etc., etc., Clearly the
> older gasket was made to work in circumstances where the mating
> surfaces weren't always perfectly flat.
> 2. I highly suspect the mechanics that installed the head last time
> did not torque the head in the proper sequence, quite possibly
> working from the outside in.
> 3. The head stud mount holes on the deck were raised a bit in couple
> places and may have caused the head to deflect a little, possibly,
> but they don't seem to have been enough to make a difference... I
> have already filed those holes down. Micheal Salter has told me
> to run a countersink to debur the hole.
>
> It's a weird one, I think possibly a combination of all three issues
> above. Let's see how she goes after I finish the job. Ultimately one
> thing I learned is I cannot anymore rely on mechanics that I do not
> know well to do work on my car... I end up having to redo everything.
>
> Best,
>
> Alan
>
> On 2/1/2021 11:23 PM, Alan Seigrist wrote:
> > All -
> >
> > Got the head off. Sure enough the gasket blew between 3&4 .  some
> > evidence of gas flow between 1&2 as well. Last pic is of me
> standing
> > in the engine compartment lifting the head off, just to make all of
> > you jealous ... :D
> >
> > Cheers,
> >
> > Alan
> >
>
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Thanks for the update, Alan. Good Luck!<br>
Bob<br>
<br>
<div class="moz-cite-prefix">On 2/2/2021 6:01 PM, Alan Seigrist
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAFBXTk+GxEC9aq=6My8Jj1BkJ-eTfKqcCJOvBFjLLKsCcdn1bA@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">
<div dir="ltr">Hi Bob -
<div><br>
</div>
<div>This gasket was put on the car only about 5K miles ago if
you can believe it, but the car sat for about 10 years
afterwards... I've checked both the head and deck with a
rectifier (see pic), both are very nicely flat and do not
need to go to the machinist. Both are flat to within 1/1000
on the surface... which is less than the error on the
rectifier!</div>
<div><br>
</div>
<div>I have the previously removed very old copper gasket
which I saved and it has no signs of gas leaking between
cylinders compared to this newer gasket that I
just removed. I discovered a few things:</div>
<div>
<ol>
<li>The old gasket is made with better quality, softer
copper, and is thicker than the newer gasket that was
put on. The old gasket that showed no problems is 1.8mm
thick after being installed, the new gasket that failed
is 1.5mm thick after being installed. The old gasket is
very nicely marked as to orientation, directions, copper
compression rings are thicker, etc., etc., Clearly the
older gasket was made to work in circumstances where the
mating surfaces weren't always perfectly flat.</li>
<li>I highly suspect the mechanics that installed the head
last time did not torque the head in the proper
sequence, quite possibly working from the outside in.  </li>
<li>The head stud mount holes on the deck were raised a
bit in couple places and may have caused the head to
deflect a little, possibly, but they don't seem to have
been enough to make a difference... I have already filed
those holes down. Micheal Salter has told me to run a
countersink to debur the hole.</li>
</ol>
<div>It's a weird one, I think possibly a combination of all
three issues above. Let's see how she goes after I finish
the job. Ultimately one thing I learned is I cannot
anymore rely on mechanics that I do not know well to do
work on my car... I end up having to redo everything.</div>
<div><br>
</div>
<div>Best,</div>
</div>
<div><br>
</div>
<div>Alan</div>
</div>
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
On 2/1/2021 11:23 PM, Alan Seigrist wrote:<br>
> All -<br>
><br>
> Got the head off. Sure enough the gasket blew between
3&4 . Â some <br>
> evidence of gas flow between 1&2 as well. Last pic
is of me standing <br>
> in the engine compartment lifting the head off, just to
make all of <br>
> you jealous ... :D<br>
><br>
> Cheers,<br>
><br>
> Alan<br>
><br>
<br>
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