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

To: Bob Spidell <bspidell@comcast.net>
Subject: Re: [Healeys] 100/4 / A90 old style valve seals
From: Michael Oritt via Healeys <healeys@autox.team.net>
Date: Mon, 22 Feb 2021 10:00:39 -0500
Cc: Austin Healey <healeys@autox.team.net>
Delivered-to: mharc@autox.team.net
Delivered-to: healeys@autox.team.net
References: <CAFBXTkJnQ57c6nPRTac7MBijhAv8LTAGwAqt4ecmW9yCOWZ1OQ@mail.gmail.com> <f410ede1-656e-9225-1cd1-43708d0ec909@comcast.net> <CAPTa0B5YLVXBihe9h4Gs8v6w1Lw8WU6JzpLe2jj-n24gus+eaA@mail.gmail.com> <CAB3i7L+nyc+e3J0YCoC14oGtFExRzpmdurZFP6WmZsUkiX+vkw@mail.gmail.com> <b76da3a3-a590-d8e4-0df1-5d01831539b5@comcast.net>
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Bob wrote:  "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."
--------------------------------------------
50 to 75 years is a pretty good replacement cycle.
Maybe we should now be searching for silicon-based motor oils?

Best--Michael Oritt

On Sun, Feb 21, 2021 at 3:47 PM Bob Spidell <bspidell@comcast.net> wrote:

> 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 <
> healeys@autox.team.net> wrote:
>
>> In the string about rubber valve seal shrouds Bob Spidell said:  "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>
>> wrote:
>>
>>> 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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>>>
>>> _______________________________________________
>> Support Team.Net http://www.team.net/donate.html
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--00000000000051446d05bbee112d
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D""><span style=3D"col=
or:rgb(51,51,255)">Bob wrote:=C2=A0 </span><font color=3D"#0000ff">&quot;I&=
#39;m surprised they lasted this long--if they did--it&#39;s a pretty harsh=
 environment for rubber. As a rule, I don&#39;t lubricate any rubber parts =
with a petroleum-based grease or oil; silicone is supposedly less antagonis=
tic to rubber.&quot;</font></div><div class=3D"gmail_default" style=3D""><f=
ont color=3D"#0000ff">--------------------------------------------</font></=
div><div class=3D"gmail_default" style=3D""><font color=3D"#0000ff">50 to 7=
5 years is a pretty good replacement cycle.=C2=A0=C2=A0</font></div><div cl=
ass=3D"gmail_default" style=3D""><font color=3D"#0000ff">Maybe we should no=
w be searching for silicon-based motor oils?</font></div><div class=3D"gmai=
l_default" style=3D""><font color=3D"#0000ff"><br></font></div><div class=
=3D"gmail_default" style=3D""><font color=3D"#0000ff">Best--Michael Oritt</=
font></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"g=
mail_attr">On Sun, Feb 21, 2021 at 3:47 PM Bob Spidell &lt;<a href=3D"mailt=
o:bspidell@comcast.net">bspidell@comcast.net</a>&gt; wrote:<br></div><block=
quote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1=
px solid rgb(204,204,204);padding-left:1ex">
 =20
   =20
 =20
  <div>
    re: &quot;... I&#39;m wondering if these things have a definite life wh=
ich
    originals are now reaching.&quot;<br>
    <br>
    I&#39;m surprised they lasted this long--if they did--it&#39;s a pretty
    harsh environment for rubber. As a rule, I don&#39;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
    &#39;slinger&#39; 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=3D"cite">
     =20
      <div dir=3D"ltr">
        <div class=3D"gmail_default" style=3D"font-family:&quot;comic sans =
ms&quot;,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&#39;m wondering if these things have a
          definite life which originals are now reaching.</div>
        <div class=3D"gmail_default" style=3D"font-family:&quot;comic sans =
ms&quot;,sans-serif;font-size:small"><br>
        </div>
        <div class=3D"gmail_default" style=3D"font-family:&quot;comic sans =
ms&quot;,sans-serif;font-size:small">M<br>
        </div>
      </div>
      <br>
      <div class=3D"gmail_quote">
        <div dir=3D"ltr" class=3D"gmail_attr">On Sun, Feb 21, 2021 at 2:27
          PM Michael Oritt via Healeys &lt;<a href=3D"mailto:healeys@autox.=
team.net" target=3D"_blank">healeys@autox.team.net</a>&gt;
          wrote:<br>
        </div>
        <blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex=
;border-left:1px solid rgb(204,204,204);padding-left:1ex">
          <div dir=3D"ltr">
            <div class=3D"gmail_default" style=3D"color:rgb(51,51,255)">In
              the string about rubber valve seal shrouds Bob Spidell
              said:=C2=A0 &quot;By no means let crumbling rubber parts see =
the
              inside of an engine.&quot;</div>
            <div class=3D"gmail_default" style=3D"color:rgb(51,51,255)"><br=
>
            </div>
            <div class=3D"gmail_default" style=3D"color:rgb(51,51,255)">Abo=
ut
              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.=C2=
=A0
              This was a head scratcher as I knew there could be no
              plastic in the engine&#39;s interior yet there it was.=C2=A0 =
After
              thinking=C2=A0about 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=C2=A0and the chain pretty
              loose.=C2=A0 I replaced the chain and tensioner--not an easy
              job--and magically a chattering sound that had
              been=C2=A0appearing at certain rpm&#39;s=C2=A0disappeared, no=
 doubt a
              harmonic rattling of the loose timing chain.</div>
            <div class=3D"gmail_default" style=3D"color:rgb(51,51,255)"><br=
>
            </div>
            <div class=3D"gmail_default" style=3D"color:rgb(51,51,255)">Bes=
t--Michael
              Oritt</div>
          </div>
          <br>
          <div class=3D"gmail_quote">
            <div dir=3D"ltr" class=3D"gmail_attr">On Sun, Feb 21, 2021 at
              12:17 PM Bob Spidell &lt;<a href=3D"mailto:bspidell@comcast.n=
et" target=3D"_blank">bspidell@comcast.net</a>&gt;
              wrote:<br>
            </div>
            <blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0=
.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Most mechanic=
s favor
              modern &#39;top hat&#39; style seals--I think they&#39;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.=C2=A0 I assume the best thing is to remove it and
              chuck it, <br>
              &gt; correct?=C2=A0 It&#39;s already half disintegrated and I=
&#39;m not
              really worried <br>
              &gt; but would prefer to not=C2=A0 put it back on and have ol=
d
              rubber parts <br>
              &gt; getting into the oil.<br>
              &gt;<br>
              &gt; Am I correct to=C2=A0not put it back on?=C2=A0 No one se=
ems to
              sell these.<br>
              &gt;<br>
              &gt; Best,<br>
              &gt;<br>
              &gt; Alan<br>
              &gt;<br>
              &gt;<br>
              <br>
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