<font color='black' size='3' face='Arial, Helvetica, sans-serif'><font class="Apple-style-span" size="3">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.</font>
<div><font class="Apple-style-span" size="3">Vance<br>
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<div style="font-family: helvetica, arial; font-size: 10pt; color: black; ">-----Original Message-----<br>
From: Alan James via Personal_Submersibles <personal_submersibles@psubs.org><br>
To: Personal Submersibles General Discussion <personal_submersibles@psubs.org><br>
Sent: Mon, Jul 21, 2014 5:59 am<br>
Subject: Re: [PSUBS-MAILIST] Minn Kota 101 - thread spec<br>
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<div><span>Hi James,</span></div>
<div style="color: rgb(0, 0, 0); font-size: 13px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span>I could generate some robust discussion here, but I don't think the wrap around tube is a very good idea.</span></div>
<div style="color: rgb(0, 0, 0); font-size: 13px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span>If you look at professional oil compensation units, they are set at about 4-5psi above ambient pressure &</span></div>
<div style="color: rgb(0, 0, 0); font-size: 13px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span>have reservoirs to compensate for oil loss & for oil expansion as it heats up.</span></div>
<div style="color: rgb(0, 0, 0); font-size: 13px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span>From past posts, Emile & Carsten had all soughts of trouble with oil compensating & Emile changed to</span></div>
<div style="color: rgb(0, 0, 0); font-size: 13px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span>rim thrusters. I have read a previous post where someone quotes a guy with years of experience modifying minnkota</span></div>
<div style="color: rgb(0, 0, 0); font-size: 13px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span>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 </span></div>
<div style="color: rgb(0, 0, 0); font-size: 13px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span>of the reason the </span><span style="background-color: transparent;">wrap around tube seems to work. Still, if water gets in there will be some protection from the oil.</span></div>
<div style="color: rgb(0, 0, 0); font-size: 13px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span style="background-color: transparent;">Cheers Alan</span></div>
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<div dir="ltr"> <hr size="1"> <font size="2" face="Arial"> <b><span style="font-weight:bold;">From:</span></b> James Frankland via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
<b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br>
<b><span style="font-weight: bold;">Sent:</span></b> Monday, July 21, 2014 9:17 PM<br>
<b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Minn Kota 101 - thread spec<br>
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<div>Hi Cliff,,</div>
<div>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?<br clear="none">
Thanks</div>
<div>James</div>
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<div class="yiv7370903011gmail_quote">On 19 July 2014 01:38, Clifford Redus via Personal_Submersibles <span dir="ltr"><<a rel="nofollow" shape="rect" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>></span> wrote:<br clear="none">
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<div>Thanks<span class="yiv7370903011HOEnZb"><font color="#888888"><br clear="none"><br clear="none"><br clear="none"></font></span>
<div>Cliff Redus</div>
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<div><br clear="none">On Jul 18, 2014, at 7:26 PM, Alec Smyth via Personal_Submersibles <<a rel="nofollow" shape="rect" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"></div>
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<div dir="ltr">Hi Cliff,
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<div>It is a parallel thread, 1 1/8" - 18.</div>
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<div>Best,</div>
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<div>Alec</div>
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<div class="yiv7370903011gmail_quote">On Fri, Jul 18, 2014 at 8:04 PM, Cliff Redus via Personal_Submersibles <span dir="ltr"><<a rel="nofollow" shape="rect" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>></span> wrote:<br clear="none">
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<div> 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.</div>
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<div>Can anyone confirm this?</div>
<span><font color="#888888"></font></span>
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<div>Cliff<br clear="none"></div>
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