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

[Michael Oritt]

Michael--

The new rubber timing chain tensioner came with installation instructions
which in part said "Replace every 50-75 years".

Best--Michael Oritt

On Sun, Feb 21, 2021 at 3:38 PM Michael Salter via Healeys <
healeys at autox.team.net> 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 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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