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That thought crossed my mind. I use silicone grease to lube oil
filter gaskets, and putting silicone dielectric grease in our
ancient electrical connectors--my dad's Model As used the same
type--seems to help prevent some of the Lucas gremlins. I use a
silicone 'oil' where light lubrication is needed and dirt and dust
can build up (speedo cables and Bendix gears on starters come to
mind).<br>
<br>
I'm taking the '50 to 75' years 'spec' with a grain of sodium
chloride; cars of that era were designed and built to last for only
a few years before being traded-in or scrapped, but my BJ8 has over
205K miles and is going strong (but shows her age).<br>
<br>
So, Alan, what did you decide?<br>
<br>
<br>
<div class="moz-cite-prefix">On 2/22/2021 7:00 AM, Michael Oritt
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAPTa0B6uwy5rv34G8UaZ3+ref_d8zMVb3651iwTXu0N_8UaqgQ@mail.gmail.com">
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<div class="gmail_default" style=""><span
style="color:rgb(51,51,255)">Bob wrote: </span><font
color="#0000ff">"I'm surprised they lasted this long--if
they did--it's a pretty harsh environment for rubber. As a
rule, I don't lubricate any rubber parts with a
petroleum-based grease or oil; silicone is supposedly less
antagonistic to rubber."</font></div>
<div class="gmail_default" style=""><font color="#0000ff">--------------------------------------------</font></div>
<div class="gmail_default" style=""><font color="#0000ff">50 to
75 years is a pretty good replacement cycle. </font></div>
<div class="gmail_default" style=""><font color="#0000ff">Maybe
we should now be searching for silicon-based motor oils?</font></div>
<div class="gmail_default" style=""><font color="#0000ff"><br>
</font></div>
<div class="gmail_default" style=""><font color="#0000ff">Best--Michael
Oritt</font></div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, Feb 21, 2021 at 3:47
PM Bob Spidell <<a href="mailto:bspidell@comcast.net"
moz-do-not-send="true">bspidell@comcast.net</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div> re: "... I'm wondering if these things have a definite
life which originals are now reaching."<br>
<br>
I'm surprised they lasted this long--if they did--it's a
pretty harsh environment for rubber. As a rule, I don't
lubricate any rubber parts with a petroleum-based grease or
oil; silicone is supposedly less antagonistic to rubber.<br>
<br>
Side note: The original car gear for the 4-cyls, with the
metal 'slinger' plate are NLA. A Moss blurb advises
transferring an original plate to one of their newer
replacements; anyone tried this (it requires rivets)?<br>
<br>
<br>
<div>On 2/21/2021 12:37 PM, Michael Salter via Healeys
wrote:<br>
</div>
<blockquote type="cite">
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<div class="gmail_default"
style="font-family:"comic sans
ms",sans-serif;font-size:small">Until fairly
recent years I had never experienced the breaking up
of the rubber slipper on timing chain tensioners but
the engine I recently disassembled had one that was
completely destroyed. Apparently this was the original
tensioner so I'm wondering if these things have a
definite life which originals are now reaching.</div>
<div class="gmail_default"
style="font-family:"comic sans
ms",sans-serif;font-size:small"><br>
</div>
<div class="gmail_default"
style="font-family:"comic sans
ms",sans-serif;font-size:small">M<br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, Feb 21, 2021
at 2:27 PM Michael Oritt via Healeys <<a
href="mailto:healeys@autox.team.net" target="_blank"
moz-do-not-send="true">healeys@autox.team.net</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px
0px 0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div dir="ltr">
<div class="gmail_default"
style="color:rgb(51,51,255)">In the string about
rubber valve seal shrouds Bob Spidell said: "By
no means let crumbling rubber parts see the inside
of an engine."</div>
<div class="gmail_default"
style="color:rgb(51,51,255)"><br>
</div>
<div class="gmail_default"
style="color:rgb(51,51,255)">About a year back I
dropped the oil pan on my 100 to replace the oil
pump and found numerous chunks of what seemed like
very hard black plastic distributed throughout the
sump. This was a head scratcher as I knew there
could be no plastic in the engine's interior yet
there it was. After thinking about it further I
decided that it could only have been the remains
of the rubber timing chain tensioner and sure
enough when I pulled the front cover I saw that
the tensioner was non-existent and the chain
pretty loose. I replaced the chain and
tensioner--not an easy job--and magically a
chattering sound that had been appearing at
certain rpm's disappeared, no doubt a harmonic
rattling of the loose timing chain.</div>
<div class="gmail_default"
style="color:rgb(51,51,255)"><br>
</div>
<div class="gmail_default"
style="color:rgb(51,51,255)">Best--Michael Oritt</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sun, Feb 21,
2021 at 12:17 PM Bob Spidell <<a
href="mailto:bspidell@comcast.net"
target="_blank" moz-do-not-send="true">bspidell@comcast.net</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px
0px 0px 0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">Most mechanics
favor modern 'top hat' style seals--I think
they're one <br>
piece--unless, of course, Concours Gold requires
blue smoke from the <br>
tailpipe.<br>
<br>
By no means let crumbling rubber parts see the
inside of an engine.<br>
<br>
Bob<br>
<br>
<br>
On 2/20/2021 9:28 PM, Alan Seigrist via Healeys
wrote:<br>
> All -<br>
><br>
> On my A90 I am lapping one of the exhaust
valves and this seal came <br>
> off the upper part of the valve guide.<br>
><br>
> It seems this is an original style valve seal
shroud which no one <br>
> sells. I assume the best thing is to remove
it and chuck it, <br>
> correct? It's already half disintegrated and
I'm not really worried <br>
> but would prefer to not put it back on and
have old rubber parts <br>
> getting into the oil.<br>
><br>
> Am I correct to not put it back on? No one
seems to sell these.<br>
><br>
> Best,<br>
><br>
> Alan<br>
><br>
><br>
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