[PSUBS-MAILIST] Motor modification

[Rick Patton via Personal_Submersibles]

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?
>
> Thanks
> James
>
> 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
> <personal_submersibles at psubs.org>> wrote:
>
>
> Hi frank
> I 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 well
> Regards
> Antoine
> On Monday, December 5, 2016, James Frankland via Personal_Submersibles <personal_submersibles at psubs.
> org <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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