[PSUBS-MAILIST] Minn Kota 101 - thread spec

Mon Jul 21 07:19:49 EDT 2014

The o-ring bucket for the shaft seal and the body seals are not actually designed for any sort of internal head pressure on the M-Ks. That said, I've seen some modified to improve the groove shape and tank tested to failure, which happened at the equivalent of 1200'. This exercise included a modification to the shaft penetration recess to allow for a ceramic pump seal installation. I think you will find that Karl S. compensates (with air) to ambient, and does a lot of diving with little or no trouble. The simple tube compensator (which serves as its own reservoir, I might add) is a time honored compromise. Cheap and effective. Snoopy uses them successfully. Mine work just fine, too.
Vance

-----Original Message-----
From: Alan James via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Mon, Jul 21, 2014 5:59 am
Subject: Re: [PSUBS-MAILIST] Minn Kota 101 - thread spec

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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