RE: [PSUBS-MAILIST] Problems with initial

["Greg Cottrell" <greg@precisionplastics.com>]

Hi Jon,

Oil filled systems usually have a "bladder" or "bellows" so that oil can
flow into the space if there are bubbles of gas that compress under
pressure- this make it less likely that seawater will try to get in to fill
the space left by the gas. A long loop of flexible tubing works fine for
something small like a trolling motor and also makes it easy to fill.

Greg


-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Jon Wallace
Sent: Thursday, March 05, 2009 11:20 AM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Problems with initial


What is the purpose of the loop of tubing? Is this to provide expansion 
for bubbles that might be present?
Jon


Greg Cottrell wrote:
>
> Hi Vance,
>
> I've always filled the motors with light oil and forgot about them. I 
> just drill/ tap the motor housing for a pair of small barb fittings 
> and connect them with a loop of clear tubing (make sure you get tube 
> that stays flexible in cold water). The oil with travel through 
> stranded wire so you'll also have to strip the insulation back on a 
> small spot, solder a small area and then pot the wire with a urethane 
> or epoxy compound. As for the oil, WD-40 works great- It displaces 
> water and won't attack electric insulation or rubber seals. There's 
> always talk on the internet about fear of metal shavings getting in 
> the oil but as far as I can see you just get a little suspended carbon 
> and it doesn't seem to have any effect on how the motors run.
>
> Greg
>




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603-529-1100
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