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Hello Roger, my friend's Healey with the Porosity problem, as we talked
about a while ago, was behind the middle tappet access cover. His leak was
at the raised boss with the threads for the tappet cover mount bolt. His
engine would only drip when cold. When the block warmed up it did not leak.
Slight heat expansion of the block was enough to stop the leak. At the end
of the day I fell back to my Jaguar servicing in the Seventies when they
said to add Bar's Stop leak when changing the coolant on their V12 engines.
Following the instructions I warmed the engine with the Bar's and fresh
coolant. As the engine cooled I used my cooling system pressure system
tester and Pressurized the system to 15 PSI and let it sit for 24 hours.
My logic was as the engine cooled and the porosity started to open the
Bar's coolant mixture would be forced into the leak. It seemed to work
because he enjoyed the car for several seasons with no issues. I instructed
him to change the oil every spring in the event of a slight leak over
Winter. We never saw any more Yellow gunk on the dipstick or on the oil
filler cap. I will caveat that Bar's stop leak from 1970 is probably
much different then what is sold now. Hoping this might help others. I
found the leak when I removed his oil pan and saw the dribble down the
inside of the block into the oil pan area.
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<div dir=3D"ltr"><div dir=3D"ltr">Hello Roger, my friend's=C2=A0 Healey=
with the Porosity problem, as we talked about a while ago, was behind the =
middle tappet access cover. His leak was at the raised boss with the thread=
s for the tappet cover mount bolt. His engine would only drip when cold. Wh=
en the block warmed up it did not leak. Slight heat expansion of the block =
was enough to stop the leak. At the end of the day I fell back to my Jaguar=
servicing in the Seventies when they said to add Bar's Stop leak when =
changing the coolant on their V12 engines. Following the instructions I war=
med the engine with the Bar's and fresh coolant. As the engine cooled I=
used my cooling system pressure=C2=A0system=C2=A0 tester and Pressurized=
=C2=A0 the system to 15 PSI and let it sit for 24 hours. My logic was as th=
e engine cooled and the porosity=C2=A0 started to open=C2=A0 the Bar's =
coolant mixture would be forced into the leak. It seemed to work because he=
enjoyed the car for several seasons with no issues. I instructed him to ch=
ange the oil every spring in the event of a slight leak over Winter. We nev=
er saw any more Yellow gunk on the dipstick=C2=A0or on the oil filler=C2=A0=
cap.=C2=A0 =C2=A0I will caveat that Bar's stop leak from=C2=A0 1970 is =
probably much different then=C2=A0what is sold now.=C2=A0 Hoping this might=
help others. I found the leak when I removed his oil pan and saw the dribb=
le down the inside of the block into the oil pan area.=C2=A0</div>
</div>
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