[PSUBS-MAILIST] Minn-Kota Shaft Seals

[Alec Smyth via Personal_Submersibles]

Will do (but after the upcoming test!) If the pressure test is
satisfactory, I think my plan would be to drill the outside seals,
effectively eliminating them, and then when the time comes to replace the
inside ones I would put the next ones in reversed. If the test is
unsatisfactory, then I'd tear them all out now and go with seal reversal
right away.

Best,

Alec

On Tue, Apr 11, 2017 at 10:19 AM, Jon Wallace via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> I don't think you need to test external pressure.  If you maintain 4psi
> over ambient then all you need to test is whether 4psi is enough to blow
> past the single seal.  You could keep cranking the pressure up within the
> motor housing to see what the cracking pressure of the seal is.  Of course
> I imagine that will change over time as the shaft and elements wear on the
> seal.
>
> Jon
>
>
> On Tuesday, April 11, 2017 8:31 AM, Private via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
> My thrusters are air compensated with the compensation pressure being
> adjustable and the system monitored via a differential pressure gauge in
> the sub. I could easily crank up the compensation pressure to test if air
> escapes a single unreversed seal (although I agree it makes sense to
> reverse it). But I don't have an easy way to test external pressure if
> that's what you meant.
>
> Thanks,
>
> Alec
>
>
>
>
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