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Probably blown gasket at the 3-4 bridge. My original head suffered from
erosion of the metal at the 1-2 bridge, allowing the gasket to blow. I had
it built up enough to work for a while but eventually replaced the head
with a DWR AL model.
Best--Michael Oritt
On Mon, Jan 25, 2021 at 4:55 AM Alan Seigrist <healey.nut@gmail.com> wrote:
> All -
>
> My A90 just started running weird. So I took a compression tester and I'm
> getting (note the A90 is lower compression than the 100):
>
> 1 - 135 psi
> 2 - 135 psi
> 3 - 60 psi
> 4 - 60 psi
>
> When I put the compression tester on number 3, I get blow back through #4
> spark plug port. Then when I put it on #4 I get blow back through the #3
> spark plug port.
>
> Seems to me it's just a blown head gasket.... am I correct? as far as I'm
> aware, these heads usually crack between 2 & 3, correct?
>
> TIA
>
> Alan
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Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"color:#3333ff">Proba=
bly blown gasket at the 3-4 bridge.=C2=A0 My original head suffered from er=
osion of the metal at the 1-2 bridge, allowing the gasket to blow.=C2=A0 I =
had it built up enough to work for a while=C2=A0but eventually replaced the=
head with a DWR AL model.=C2=A0=C2=A0</div><div class=3D"gmail_default" st=
yle=3D"color:#3333ff"><br></div><div class=3D"gmail_default" style=3D"color=
:#3333ff">Best--Michael Oritt</div></div><br><div class=3D"gmail_quote"><di=
v dir=3D"ltr" class=3D"gmail_attr">On Mon, Jan 25, 2021 at 4:55 AM Alan Sei=
grist <<a href=3D"mailto:healey.nut@gmail.com";>healey.nut@gmail.com</a>&=
gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0=
px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div =
dir=3D"ltr">All -<div><br></div><div>My A90 just started running weird.=C2=
=A0 So I took a compression tester and I'm getting (note the A90 is low=
er compression than the 100):<br><br>1 - 135 psi<br>2 - 135 psi</div><div>3=
- 60 psi</div><div>4 - 60 psi</div><div><br></div><div>When I put the comp=
ression tester on number 3, I get blow back through #4 spark plug port.=C2=
=A0 Then when I put it on #4 I get blow back through the #3 spark plug port=
.<br><br>Seems to me it's just a blown head gasket.... am I correct?=C2=
=A0 as far as I'm aware, these heads usually crack between 2 & 3, c=
orrect?</div><div><br></div><div>TIA<br><br>Alan</div></div>
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