<div dir="ltr"><div class="gmail_default" style="color:#3333ff">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:#3333ff"><br></div><div class="gmail_default" style="color:#3333ff">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:#3333ff"><br></div><div class="gmail_default" style="color:#3333ff">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">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>
<br>
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