You could source new seals on McMaster-Carr which will probably be the
cheapest route.

A hydraulic shop will probably have the seals on hand and be able to
install at their hourly rate - second cheapest.

When I sent my Navtec cylinders (2) to Lew Townsend (+1 206-498-7282) at
Sound Rigging in Seattle WA, I didn't exactly expect much more than a
typical hydraulic shop with the exception that it would be done with
authentic Navtec parts.  When he called to tell me that one of my pistons
was bent (out of true) and that he had straightened it, I was surprised.
When he further relayed that he was in the process of polishing the
pistons, I was more shocked.  And then he described having performed a 24
hour pressure drop test.  These interactions reassured me that while he may
not have been the cheapest he was certainly very high quality and high
value.

As a comparison, when I bought the boat, back in May of 2012, the PO was
dismayed by the small ring of oil accumulating around the pistons.  In
frustration he stated that he had just had the cylinders rebuilt at a local
hydraulic shop.

Josh Muckley
S/V Sea Hawk
1989 C&C 37+
Solomons, MD



On Wed, Mar 21, 2018, 11:19 PM Dan via CnC-List <cnc-list@cnc-list.com>
wrote:

> Hey everyone,
> I noticed that my hydraulic backstay was leaking a little hydraulic fluid
> around the piston point - an indication that a seal inside probably needs
> replacing... I noticed that over the winter most of the fluid has leaked
> out and the backstay will no longer hold pressure. We've had temperatures
> as low as -19 deg. Celcius here in Canada, just wondering if this leaking
> is normal with a bad seal or is there more at play here with leaving my
> hydraulics exposed to the harsh cold environment?
>
> Thanks,
>
> Dan
> Breakaweigh
> C&C44
> Halifax, NS
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