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

[Michael Salter]

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 at 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 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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