[PSUBS-MAILIST] Minn Kota 101 - thread spec

[Alan James via Personal_Submersibles]

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> wrote:


>
>
>Thanks
>
>
>
>Cliff Redus
>
>On Jul 18, 2014, at 7:26 PM, Alec Smyth via Personal_Submersibles <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> 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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