[PSUBS-MAILIST] Oil Compensator

[Sean T. Stevenson via Personal_Submersibles]

The best practice may not be easily achievable with a Minn-Kota without extensive modification. That said, I would orient an inner seal with lip inwards, and an outer seal with lip outwards. Pressure compensate the motor cavity with oil at a bias pressure above ambient, and separately pressure compensate the inter-seal cavity with oil at exactly ambient pressure. This way, you are either changing pressure or changing fluid across any single seal, but not both simultaneously. Minor leakage across either seal in this implementation is inconsequential. Both compensation mechanisms should have some reserve volume to account for thermal expansion of the oil.

Sean


On April 5, 2017 11:49:51 AM MDT, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>I haven't designed mine yet Rick which is why I'm asking the question. 
>
>I guess the first question is whether one of the seals can be reversed 
>to prevent oil from escaping around the motor shaft.  I think I recall 
>Hank mentioning something about this but I don't know if it was on a 
>minn-kota.  I'm also not sure if oil egress is due to heat/pressure 
>build up or because the motor is designed to keep water out, not oil
>in.
>
>We've got different people saying different things so I'm hoping we can
>
>come up with a "best practice" solution and document it in a white
>paper.
>
>Jon
>
>
>On 4/5/2017 1:23 PM, Rick Patton via Personal_Submersibles wrote:
>> Jon
>>
>> What type of system did you use for the oil to go to when it gets
>hot?
>>
>> Rick
>
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