[PSUBS-MAILIST] Minn-Kota Shaft Seals

[Private via Personal_Submersibles]

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

> On Apr 11, 2017, at 8:12 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Jon,
> Alec's drill solution will work for sure, but the seals still have to come out to reverse the inner seal.  I am still convinced it needs to be reversed.
> In my case the inner seal would be ruined and the outer seal can be saved, that outer seal can then become the inner seal.  If there is concern about the seal leaking overnight weather air or oil compensated, it won't leak.  The proof is in the fact that the inner seal in original orientation is holding air at 4 psi and water at 15 psi.  Surely if the seal can hold air backwards then it will hold oil or water in or out.  
> I do have a chamber big enough for the testing but I do not have the same motors, mine are 3.25 dia and my 50lb verticals are different than your 101's
> Hank
> 
> 
> On Tuesday, April 11, 2017 5:42 AM, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Alec's idea of simply drilling a small hole through the outer seal effectively eliminates it, if I understand the concept correctly.  It also eliminates the need to take the motor apart to remove and replace the seals/bearing.
> 
> Folks, do we have a resource that could pressure test a one seal solution as installed from the factory?
> 
> Jon
> 
> 
> 
> On Monday, April 10, 2017 11:18 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> I am not sure why there is an interest in keeping both seals, to my mind the outer seal is dead weight.  Unless you do as Sean says, to compensate the space between seals, the outer seal is useless.  Having two opposite seals is guaranteeing to trap water without Sean's solution.  The proof is in the submersible pumps that operate deeper than our subs.  Just my two cents ;-)
> Hank
> 
> 
> 
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