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Hi Michael -
Sounds to me the smart thing to do is put in a steel head gasket because
the head was rebuilt not that many miles ago, so I might have a low spot
there. The head is torqued correctly so that's not it.
Best,
Alan
On Mon, Jan 25, 2021 at 10:27 PM Michael Oritt <michael.oritt@gmail.com>
wrote:
> 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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<div dir=3D"ltr">Hi Michael -<div><br></div><div>Sounds to me the smart thi=
ng to do is put in a steel head=C2=A0gasket because the head was rebuilt no=
t that many miles ago, so I might have a low spot there.=C2=A0 The head is =
torqued correctly so that's not it.</div><div><br></div><div>Best,</div=
><div><br></div><div>Alan<br><div><br></div><div><br></div></div></div><br>=
<div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Ja=
n 25, 2021 at 10:27 PM Michael Oritt <<a href=3D"mailto:michael.oritt@gm=
ail.com">michael.oritt@gmail.com</a>> wrote:<br></div><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex"><div dir=3D"ltr"><div class=3D"gmail_defau=
lt" style=3D"color:rgb(51,51,255)">Probably blown gasket at the 3-4 bridge.=
=C2=A0 My original head suffered from erosion of the metal at the 1-2 bridg=
e, 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" style=3D"color:rgb(51,51,255)"><br></=
div><div class=3D"gmail_default" style=3D"color:rgb(51,51,255)">Best--Micha=
el Oritt</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=
=3D"gmail_attr">On Mon, Jan 25, 2021 at 4:55 AM Alan Seigrist <<a href=
=3D"mailto:healey.nut@gmail.com"; target=3D"_blank">healey.nut@gmail.com</a>=
> wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px =
0px 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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