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

[Michael Oritt]

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 at 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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