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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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Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:comic sa=
ns ms,sans-serif;font-size:small">Until fairly recent years I had never exp=
erienced the breaking up of the rubber slipper on timing chain tensioners b=
ut 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 cla=
ss=3D"gmail_default" style=3D"font-family:comic sans ms,sans-serif;font-siz=
e:small"><br></div><div class=3D"gmail_default" style=3D"font-family:comic =
sans ms,sans-serif;font-size:small">M<br></div></div><br><div class=3D"gmai=
l_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Sun, Feb 21, 2021 at 2:27=
PM Michael Oritt via Healeys <<a href=3D"mailto:healeys@autox.team.net"=
>healeys@autox.team.net</a>> 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 "By no means let crumbling rubber parts see the i=
nside of an engine."</div><div class=3D"gmail_default" style=3D"color:=
rgb(51,51,255)"><br></div><div class=3D"gmail_default" style=3D"color:rgb(5=
1,51,255)">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 pla=
stic distributed throughout the sump.=C2=A0 This was a head scratcher as I =
knew there could be no plastic in the engine's interior yet there it wa=
s.=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--no=
t an easy job--and magically a chattering sound that had been=C2=A0appearin=
g at certain rpm's=C2=A0disappeared, no doubt a harmonic rattling of th=
e 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)">Best--Michael Oritt</div></div><br><div class=3D"gmail_quote"><div d=
ir=3D"ltr" class=3D"gmail_attr">On Sun, Feb 21, 2021 at 12:17 PM Bob Spidel=
l <<a href=3D"mailto:bspidell@comcast.net"; target=3D"_blank">bspidell@co=
mcast.net</a>> 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 mechanics favor modern 'top hat' style seals--I thi=
nk 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 <b=
r>
> 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.=C2=A0 I assume the best thing is to remove it and chuck it, <br=
>
> correct?=C2=A0 It's already half disintegrated and I'm not rea=
lly worried <br>
> but would prefer to not=C2=A0 put it back on and have old rubber parts=
<br>
> getting into the oil.<br>
><br>
> Am I correct to=C2=A0not put it back on?=C2=A0 No one seems to sell th=
ese.<br>
><br>
> Best,<br>
><br>
> Alan<br>
><br>
><br>
<br>
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