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Hi Perry -
Yes, I retorqued it myself after a couple thousand miles.
Best,
Alan
On Wed, Feb 3, 2021 at 10:49 AM <healeyguy@aol.com> wrote:
> Alan
> Was the head retorqued after installed and run in? I realize it has been a
> long time so that info may not be available.
> Perry
>
>
> -----Original Message-----
> From: Alan Seigrist <healey.nut@gmail.com>
> To: Bob Spidell <bspidell@comcast.net>
> Cc: Healey list <healeys@autox.team.net>
> Sent: Tue, Feb 2, 2021 9:01 pm
> Subject: Re: [Healeys] A90 Head Update
>
> 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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Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr">Hi Perry -<div><br></div><div>Yes, I retorqued it myself a=
fter a couple thousand miles.</div><div><br></div><div>Best,</div><div><br>=
</div><div>Alan</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" =
class=3D"gmail_attr">On Wed, Feb 3, 2021 at 10:49 AM <<a href=3D"mailto:=
healeyguy@aol.com">healeyguy@aol.com</a>> wrote:<br></div><blockquote cl=
ass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid=
rgb(204,204,204);padding-left:1ex">
<div style=3D"color:black;font:10pt Arial,Helvetica,sans-serif">Alan
<div>Was the head retorqued after installed and run in? I realize it has be=
en a long time so that info may not be available.</div>
<div>Perry=C2=A0<br>
<br>
<br>
<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black">-----=
Original Message-----<br>
From: Alan Seigrist <<a href=3D"mailto:healey.nut@gmail.com"; target=3D"_=
blank">healey.nut@gmail.com</a>><br>
To: Bob Spidell <<a href=3D"mailto:bspidell@comcast.net"; target=3D"_blan=
k">bspidell@comcast.net</a>><br>
Cc: Healey list <<a href=3D"mailto:healeys@autox.team.net"; target=3D"_bl=
ank">healeys@autox.team.net</a>><br>
Sent: Tue, Feb 2, 2021 9:01 pm<br>
Subject: Re: [Healeys] A90 Head Update<br>
<br>
<div id=3D"gmail-m_5841794668378181620yiv7555033341">
<div>
<div dir=3D"ltr">
<div dir=3D"ltr">Hi Bob -
<div><br clear=3D"none"></div>
<div>This gasket was put on the car only about 5K miles ago if you can beli=
eve it, but the car sat for about 10 years afterwards...=C2=A0 I've che=
cked both the head and deck with a rectifier (see pic), both are very nicel=
y flat and do not need to go to the machinist.=C2=A0 Both are flat to withi=
n 1/1000 on the surface... which is less than the error on the rectifier!</=
div>
<div><br clear=3D"none"></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 ga=
sket that=C2=A0I just=C2=A0removed.=C2=A0 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.=C2=A0 The old gasket tha=
t showed no problems is 1.8mm thick after being installed, the new gasket t=
hat failed is 1.5mm thick after being installed.=C2=A0 The old gasket is ve=
ry nicely=C2=A0marked as to orientation, directions, copper compression rin=
gs are thicker, etc., etc.,=C2=A0 Clearly the older gasket was made to work=
in circumstances where the mating surfaces weren't always perfectly fl=
at.</li><li>I highly suspect the mechanics that installed the head last tim=
e did not torque the head in the proper sequence, quite possibly working fr=
om the outside in.=C2=A0=C2=A0</li><li>The head stud mount holes on the dec=
k were raised a bit in couple places and may have caused the head to deflec=
t a little, possibly, but they don't seem to have been enough to make a=
difference... I have already filed those holes down.=C2=A0 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 issu=
es above.=C2=A0 Let's see how she goes after I finish the job.=C2=A0 Ul=
timately one thing I learned is I cannot anymore rely on mechanics that I d=
o not know well to do work on my car... I end up having to redo everything.=
</div>
<div><br clear=3D"none"></div>
<div>Best,</div>
</div>
<div id=3D"gmail-m_5841794668378181620yiv7555033341yqtfd76764">
<div><br clear=3D"none"></div>
<div>Alan</div>
</div>
</div>
<div><blockquote style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex">
<div id=3D"gmail-m_5841794668378181620yiv7555033341yqtfd46821">
On 2/1/2021 11:23 PM, Alan Seigrist wrote:<br clear=3D"none">
> All -<br clear=3D"none">
><br clear=3D"none">
> Got the head off.=C2=A0 Sure enough the gasket blew between 3&4 . =
=C2=A0some <br clear=3D"none">
> evidence of gas flow between 1&2 as well. Last pic is of me standi=
ng <br clear=3D"none">
> in the engine compartment lifting the head off, just to make all of <b=
r clear=3D"none">
> you jealous ... :D<br clear=3D"none">
><br clear=3D"none">
> Cheers,<br clear=3D"none">
><br clear=3D"none">
> Alan<br clear=3D"none">
><br clear=3D"none">
<br clear=3D"none">
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