Hi, Craig, prior to having my 1163 serviced I did the same thing for both my pushers and crown... worked like a charm hehe...

I will say this, it's just an added protection for a some water, e.g., washing your hands or being rained on being careful not to operate the chronograph but not for anything crazy like going for a dive in the water...These guys are so old that I simply stay clear of water even though gaskets are new.

: Recently I have been getting a lot of requests from repair
: customers to replace the crown seal(s) and pusher seals on
: vintage Heuers. The pusher seals are pretty straight forward but
: the crown seals are a bit tricky. I have taken apart a couple of
: Autavia 1163 crowns to see what is really needed. Here is what I
: found:
: 1) if you remove the steel cap on the back it will most likely be
: damaged and not reusable - see pic below - damaged cap on the
: right. The cap to the left of it came from another WP crown and
: was turned down to fit (its a compression fit and has to be just
: the right size).
: 2) both of the crowns I took apart had seals that had turned to
: goop so I am not sure what they looked like original but the
: depth in the crown for the seal is 1.5mm suggesting a tube seal
: as opposed to a single O ring seal.
: 3) I had to do a lot of searching to find something that would work
: and one of the responses to a prior post suggested Cousins in
: the UK for seals. They had what I needed - 2.50 x 0.65 x 3.80mm.
: 4) I have used 50/50 Simple Green and water to remove the goop
: soaking the parts overnight but there are solvents that work
: faster. However, lacquer thinner does not seem to work well with
: this kind of goop.
: 5) I put the new cap on the crown and pushed the seals (2) gently
: through the opening with tweezers (dull ends to avoid damage).
: This was not hard at all and given the depth I don't think a
: single seal will always make proper contact.
: In the end it turned out to be a fairly simple solution and may be
: possible with the stem still in place. I do not have WP pressure
: tester but if someone else has one and wants to do a test, I
: will supply this crown temporarally to find out how it works
: out.

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