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"... the two other annoying leaks I had on the engine, one from the rear
main and one from the front crankshaft seal both stopped completely as
soon as I replaced the cork rocker cover gasketwith a silicone one."
For the life of me I can't think of why that would happen (but glad for
you that it did). The only thing that I could think of is if the valve
cover gasket leaked profusely, it /might /relieve some crankcase
pressure hence reducing some leakage from those places.
Bob
On 11/5/2016 9:48 PM, Austin Healeys List wrote:
> Hi Roger,
>
> The overdrive brake ring will seal fine whatever you put on it- as
> long as you don't drive anywhere! The issue is that there are only
> four bolts holding the back housing on and in between them at the
> bottom is a cantilevered lug that takes all the reaction force of the
> engine and transmission when applying the brakes. The housing just
> opens up a little under braking and there you go, instant oil leak.
>
> A solution I found successful was to grind a curved slot around both
> sides of the steel sandwich plate with a Dremel about 1mm deep and
> when assembling it, cover the faces and fill the slot with 3-bond 1215
> silicone. When the slot opens up, the silicone in the groove stays
> flexible enough to bridge the gap.Oring cord could work too but I
> didn't have anything to machine the groove accurately enough.
>
> Slightly related- the two other annoying leaks I had on the engine,
> one from the rear main and one from the front crankshaft seal both
> stopped completely as soon as I replaced the cork rocker cover gasket
> with a silicone one. The rocker cover has a similar issue in that only
> two bolts are expected to hold the entire thing on and cork simply
> can't flex and comply like silicone can when the cover starts dancing
> around on the various resonant frequencies produced by the engine.
>
> Andy.
>
>
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<p>"... the two other annoying leaks I had on the engine, one from
the rear main and one from the front crankshaft seal both stopped
completely as soon as I replaced the cork rocker cover gasketwith
a silicone one."</p>
<p>For the life of me I can't think of why that would happen (but
glad for you that it did). The only thing that I could think of
is if the valve cover gasket leaked profusely, it <i>might </i>relieve
some crankcase pressure hence reducing some leakage from those
places.<br>
</p>
Bob<br>
<br>
<div class="moz-cite-prefix">On 11/5/2016 9:48 PM, Austin Healeys
List wrote:<br>
</div>
<blockquote
cite="mid:CAGHuNqC3BiDvBjRzq3PP1BCQHouuH35xxC8aht_EYCD8tXm73Q@mail.gmail.com"
type="cite">
<pre wrap="">Hi Roger,
The overdrive brake ring will seal fine whatever you put on it- as
long as you don't drive anywhere! The issue is that there are only
four bolts holding the back housing on and in between them at the
bottom is a cantilevered lug that takes all the reaction force of the
engine and transmission when applying the brakes. The housing just
opens up a little under braking and there you go, instant oil leak.
A solution I found successful was to grind a curved slot around both
sides of the steel sandwich plate with a Dremel about 1mm deep and
when assembling it, cover the faces and fill the slot with 3-bond 1215
silicone. When the slot opens up, the silicone in the groove stays
flexible enough to bridge the gap.Oring cord could work too but I
didn't have anything to machine the groove accurately enough.
Slightly related- the two other annoying leaks I had on the engine,
one from the rear main and one from the front crankshaft seal both
stopped completely as soon as I replaced the cork rocker cover gasket
with a silicone one. The rocker cover has a similar issue in that only
two bolts are expected to hold the entire thing on and cork simply
can't flex and comply like silicone can when the cover starts dancing
around on the various resonant frequencies produced by the engine.
Andy.
</pre>
</blockquote>
<br>
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