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AlanWas the head retorqued after installed and run in? I realize it has bee=
n a long time so that info may not be available.Perry=C2=A0
-----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 i=
t, but the car sat for about 10 years afterwards...=C2=A0 I've checked both=
the head and deck with a rectifier (see pic), both are very nicely flat an=
d do not need to go to the machinist.=C2=A0 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 h=
as no signs of gas leaking between cylinders compared to this newer gasket =
that=C2=A0I just=C2=A0removed.=C2=A0 I discovered a few things: =20
- The old gasket is made with better quality, softer copper, and is thic=
ker than the newer gasket that was put on.=C2=A0 The old gasket that showed=
no problems is 1.8mm thick after being installed, the new gasket that fail=
ed is 1.5mm thick after being installed.=C2=A0 The old gasket is very nicel=
y=C2=A0marked as to orientation, directions, copper compression rings are t=
hicker, etc., etc.,=C2=A0 Clearly the older gasket was made to work in circ=
umstances where the mating surfaces weren't always perfectly flat.
- I highly suspect the mechanics that installed the head last time did n=
ot torque the head in the proper sequence, quite possibly working from the =
outside in.=C2=A0=C2=A0
- The head stud mount holes on the deck were raised a bit in couple plac=
es 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 th=
ose holes down.=C2=A0 Micheal Salter has told me to run a countersink to de=
bur the hole.
It's a weird one, I think possibly a combination of all three issues above.=
=C2=A0 Let's see how she goes after I finish the job.=C2=A0 Ultimately one =
thing I learned is I cannot anymore rely on mechanics that I do not know we=
ll 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.=C2=A0 Sure enough the gasket blew between 3&4 . =C2=A0s=
ome=20
> evidence of gas flow between 1&2 as well. Last pic is of me standing=20
> in the engine compartment lifting the head off, just to make all of=20
> you jealous ... :D
>
> Cheers,
>
> Alan
>
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<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 <br>
<br>
<br>
<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black">-----=
Original Message-----<br>
From: Alan Seigrist <healey.nut@gmail.com><br>
To: Bob Spidell <bspidell@comcast.net><br>
Cc: Healey list <healeys@autox.team.net><br>
Sent: Tue, Feb 2, 2021 9:01 pm<br>
Subject: Re: [Healeys] A90 Head Update<br>
<br>
<div id=3D"yiv7555033341">
<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... I've checked=
both the head and deck with a rectifier (see pic), both are very nicely fl=
at 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 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 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 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. The old gasket is ve=
ry nicely marked as to orientation, directions, copper compression rin=
gs 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 di=
d not torque the head in the proper sequence, quite possibly working from t=
he outside in. </li><li>The head stud mount holes on the deck we=
re 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 differe=
nce... 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 a=
bove. 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 kn=
ow 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 class=3D"yiv7555033341yqt4335541407" id=3D"yiv7555033341yqtfd76764">
<div><br clear=3D"none"></div>
<div>Alan</div>
</div>
</div>
<div class=3D"yiv7555033341gmail_quote"><blockquote class=3D"yiv7555033341g=
mail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204=
,204,204);padding-left:1ex;">
<div class=3D"yiv7555033341yqt4335541407" id=3D"yiv7555033341yqtfd46821">
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. Sure enough the gasket blew between 3&4 . =
some <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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