[Healeys] 100-4 engine head gasket?

Alan Seigrist healey.nut at gmail.com
Mon Jan 25 19:54:29 MST 2021


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 at 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 at 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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