Re: [Healeys] 100/4 / A90 old style valve seals

[Bob Spidell <bspidell@comcast.net>]

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re: "... I'm wondering if these things have a definite life which 
originals are now reaching."

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.

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)?


On 2/21/2021 12:37 PM, Michael Salter via Healeys wrote:
> 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.
>
> M
>
> On Sun, Feb 21, 2021 at 2:27 PM Michael Oritt via Healeys 
>
>     In the string about rubber valve seal shrouds Bob Spidell said:Â 
>     "By no means let crumbling rubber parts see the inside of an engine."
>
>     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.
>
>     Best--Michael Oritt
>
>     On Sun, Feb 21, 2021 at 12:17 PM Bob Spidell <bspidell@comcast.net
>
>         Most mechanics favor modern 'top hat' style seals--I think
>         they're one
>         piece--unless, of course, Concours Gold requires blue smoke
>         from the
>         tailpipe.
>
>         By no means let crumbling rubber parts see the inside of an
>         engine.
>
>         Bob
>
>
>         On 2/20/2021 9:28 PM, Alan Seigrist via Healeys wrote:
>         > All -
>         >
>         > On my A90 I am lapping one of the exhaust valves and this
>         seal came
>         > off the upper part of the valve guide.
>         >
>         > It seems this is an original style valve seal shroud which
>         no one
>         > sells.  I assume the best thing is to remove it and chuck it,
>         > correct?  It's already half disintegrated and I'm not really
>         worried
>         > but would prefer to not  put it back on and have old rubber
>         parts
>         > getting into the oil.
>         >
>         > Am I correct to not put it back on?  No one seems to sell these.
>         >
>         > Best,
>         >
>         > Alan
>         >
>         >
>
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    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 class="moz-cite-prefix">On 2/21/2021 12:37 PM, Michael Salter
      via Healeys wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAB3i7L+nyc+e3J0YCoC14oGtFExRzpmdurZFP6WmZsUkiX+vkw@mail.gmail.com">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <div dir="ltr">
        <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 &lt;<a
            href="mailto:healeys@autox.team.net"; 
moz-do-not-send="true">healeys@autox.team.net</a>&gt;
          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:Â  "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 &lt;<a
                href="mailto:bspidell@comcast.net"; target="_blank"
                moz-do-not-send="true">bspidell@comcast.net</a>&gt;
              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>
              &gt; All -<br>
              &gt;<br>
              &gt; On my A90 I am lapping one of the exhaust valves and
              this seal came <br>
              &gt; off the upper part of the valve guide.<br>
              &gt;<br>
              &gt; It seems this is an original style valve seal shroud
              which no one <br>
              &gt; sells.  I assume the best thing is to remove it and
              chuck it, <br>
              &gt; correct?  It's already half disintegrated and I'm not
              really worried <br>
              &gt; but would prefer to not  put it back on and have old
              rubber parts <br>
              &gt; getting into the oil.<br>
              &gt;<br>
              &gt; Am I correct to not put it back on?  No one seems to
              sell these.<br>
              &gt;<br>
              &gt; Best,<br>
              &gt;<br>
              &gt; Alan<br>
              &gt;<br>
              &gt;<br>
              <br>
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