Put them over the valve stem before sliding the seals down, else you
will surely take bites out of them on the way over the keeper slots,
rendering them useless.
Peter
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For anyone on the list who has experience replacing W123 valve stem seals, I
obtained a new set of these and before I tear into things I need to ask what
the purple spiral striped plastic tubular thingies are for as the procedure
(05-270) from the W123 engine workshop manual doesn't mention
Iirc you use those to protect the seal as you slide it on, like you use the
cup for the front main seal on a 61x engine.
Lube up, insert gently, slide over valve, seat it, carefully remove plastic
tube.
Someone correct me if I got the procedure wrong, my brain is in wheelspin
mode right now.
