[Healeys] 100-4 engine head gasket?

[greylinn at ozemail.com.au]

…exactly what I had with the Ward Spl motor after a tyre kicking non-buyer floored the throttle in overdrive top at about 40kph going uphill! Detonation big time! I put some crack testing penetrating dye in no3. Spun the motor over then checked no.4 with some paper towel – bingo red dye in no.4 = blown gasket.

 

 

Cheers

 

Peter Linn

Brisbane

 

From: Healeys <healeys-bounces at autox.team.net> On Behalf Of Alan Seigrist
Sent: Monday, 25 January 2021 7:56 PM
To: Healey list <Healeys at autox.team.net>
Subject: [Healeys] 100-4 engine head gasket?

 

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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