[PSUBS-MAILIST] Motor modification

Mon Dec 5 14:09:41 EST 2016

Rick, you are correct, no bladder.  It is likely there is a wee bit of water due to expansion and contraction.  In salt water, I would drill and tap under the prop for filling and then another port at the opposite end where it is convenient for an expansion\compensation bladder.  If you use a clear bladder and tube, you can put the motor vertical, prop end up to fill.  Then manipulate the bladder at the same time to work out any bubbles.  That is just my thoughts, no best way here, just different.Hank 

    On Monday, December 5, 2016 11:53 AM, Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Hank,
Am I correct in assuming that you only drilled and tapped a hole in the prop end to add oil but there is no bladder for the oil to expand when hot and why did you choose that end to drill instead of the other end or body of the motor?You also mentioned that you get a little fresh water in your motor when you change out the oil every year. Do you think that this is because there is no place for the expanded oil to go when it gets hot so when it does, it pushes out past the prop shaft 0 ring and also allows a little lake water to come the other way when the oil cools down? We have no lakes on the big island so my diving will always be in salt water which will not be good on the insides.
Rick 

On Mon, Dec 5, 2016 at 7:31 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

James,No bladder, nothing, fill er up and go diving.  I drain the oil in the fall and put new in the spring.  It takes on a tiny bit of water, but no bother because it is fresh water, not that horrible salty stuff you dive in.   But in the past I found that hose is to stiff,  I like the rubber bladder idea best.  I have also used little air cylinders threaded strait onto the motor housing. 

    On Monday, December 5, 2016 8:45 AM, James Frankland via Personal_Submersibles <personal_submersibles at psubs. org> wrote:

 Hi Antoine\Hank.
Thanks guys.  drinking bladder looks good.  I was thinking of a furniture lift bag, which is very similar.  I use a hot water bottle for the aft motor. Hank, what do you use for a bladder? ThanksJames  
On 5 December 2016 at 13:18, hank pronk via Personal_Submersibles <personal_submersibles at psubs. org> wrote:

James,I put my fill plug under the prop, in the flat end cap,  and it works like a dream. Hank 

    On Monday, December 5, 2016 5:37 AM, Antoine Delafargue via Personal_Submersibles <personal_submersibles at psubs. org> wrote:

 Hi frankI have done something like that for my prop shaft seal oil filled compartment.  But first i removed the hose and filled with a serynge with long steel needle. Then put the tube and filled it with the serynge. The tube is flexible and transparent, from endurance sport platypus drinking bladder
Works wellRegards Antoine 
On Monday, December 5, 2016, James Frankland via Personal_Submersibles <personal_submersibles at psubs. org> wrote:

Hi All I have been talking to Rick about motor compensation which has got me thinking. I originally did my motors like other psubbers have done with the rubber tubes around the sides, but have found them a real pain to fill.  Problem is the location of the tube, plus the tiny bit of protruding pipe nipple on the inside. So, I modified the motors by drilling a hole in the top part of the aluminium endcap and use that now as the vent\final fill.  Its better, but still awkward. I have suggested to Rick this idea, which I am tempted to adopt myself.  Blocking off the existing side mounted pipe nipples and filling\venting\compensating all from the one top hole.  There would be a rubber bulb of some sort on the end of the pipe.  2x pictures show filling and operation.  Appologies for rubbish drawings, im at work. What does everyone think? 

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