[PSUBS-MAILIST] Minn Kota 101 - thread spec

[Jon Wallace via Personal_Submersibles]

On 7/21/2014 5:56 AM, Alan James via Personal_Submersibles wrote:
> Hi James,
> I could generate some robust discussion here, but I don't think the 
> wrap around tube is a very good idea.
> If you look at professional oil compensation units, they are set at 
> about 4-5psi above ambient pressure &
> have reservoirs to compensate for oil loss & for oil expansion as it 
> heats up.
> From past posts, Emile & Carsten had all soughts of trouble with oil 
> compensating & Emile changed to
> rim thrusters. I have read a previous post where someone quotes a guy 
> with years of experience modifying minnkota
> motors for underwater use, as saying that 3 out of 4 can operate down 
> to 100ft without any compensation. I think this may be part
> of the reason the wrap around tube seems to work. Still, if water gets 
> in there will be some protection from the oil.
> Cheers Alan
>
>
> ------------------------------------------------------------------------
> *From:* James Frankland via Personal_Submersibles 
> <personal_submersibles at psubs.org>
> *To:* Personal Submersibles General Discussion 
> <personal_submersibles at psubs.org>
> *Sent:* Monday, July 21, 2014 9:17 PM
> *Subject:* Re: [PSUBS-MAILIST] Minn Kota 101 - thread spec
>
> Hi Cliff,,
> Others may disagree with this, but ive got a suggestion.  If your oil 
> compensating the motors and are going to add the wrap around 
> tube\bladder as per Alecs Snoopy, I would suggest, adding a vent hole 
> somewhere near the aft bearing.  With my setup, ive put the tube going 
> around the motor and its all ok.  But, I just cannot get the last 
> dregs of air out.  No matter what I do.  I suspect that its because 
> the pipe nipple protrudes a mm or so into the casing and so will not 
> allow the last bit of air out.  It really irritates me and I worry 
> that the motor is not properly compensated.  So, I am going to make a 
> modification to the motor like this pic.  I think this will work, the 
> suspect bit is mating the plug against the slightly domed motor case.  
> I think a large rubber washer should seal it.   The i should be able 
> to rotate the motor and remove the last dregs of air.  What do you think?
> Thanks
> James
>
>
>
> On 19 July 2014 01:38, Clifford Redus via Personal_Submersibles 
> <personal_submersibles at psubs.org 
> <mailto:personal_submersibles at psubs.org>> wrote:
>
>
>
>     Thanks
>
>
>     Cliff Redus
>
>     On Jul 18, 2014, at 7:26 PM, Alec Smyth via Personal_Submersibles
>     <personal_submersibles at psubs.org
>     <mailto:personal_submersibles at psubs.org>> wrote:
>
>>     Hi Cliff,
>>
>>     It is a parallel thread, 1 1/8" - 18.
>>
>>     Best,
>>
>>     Alec
>>
>>
>>     On Fri, Jul 18, 2014 at 8:04 PM, Cliff Redus via
>>     Personal_Submersibles <personal_submersibles at psubs.org
>>     <mailto:personal_submersibles at psubs.org>> wrote:
>>
>>          Does anyone have any documentation on the Minn Kota 101 main
>>         support female thread spec?  It does not look like a tapered
>>         pipe thread and the threads per inch look to great. I put a
>>         digital caliper on this at it read 1.064-1.07 inches for the
>>         minor diameter.  I measured the threads and it is 18 threads
>>         per inch.    I looked in the machine handbook and the closest
>>         that comes is a 1-1/8  UNEF (Extra fine thread series).
>>         The major and minor diameters for a 1-1/8" UNEF are 1.1250"
>>         and 1.0649"  respectively.
>>
>>         Can anyone confirm this?
>>
>>         Cliff
>>
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>>
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