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

[Bob Spidell]

re: "... I'm wondering if these things have a definite life which 
originals are now reaching."

I'm surprised they lasted this long--if they did--it's a pretty harsh 
environment for rubber. As a rule, I don't lubricate any rubber parts 
with a petroleum-based grease or oil; silicone is supposedly less 
antagonistic to rubber.

Side note: The original car gear for the 4-cyls, with the metal 
'slinger' plate are NLA. A Moss blurb advises transferring an original 
plate to one of their newer replacements; anyone tried this (it requires 
rivets)?


On 2/21/2021 12:37 PM, Michael Salter via Healeys 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 <mailto: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
>     <mailto: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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