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Old May 01, 2014, 11:00 AM
Ah, so its THIS again. . .
Ronin055's Avatar
United States, NV, Sparks
Joined Jan 2013
327 Posts
This AM I got the sub in the pool. Dorsal rudder loosened up a touch. CRAP! ok no problem. Then it loosened up completely. And guess what driver I didnt have with me. Ya, that one.

The Foam I added Yesterday was just a hair to much. Ok. Out of the pool, deploy knife, trim 1/4 inch off block of foam. Aaaaaannnnnd. . . . . TA-DA !!! now its to low. CRAP !!! LoL

Take it out of the pool, . . . and theres water in the engine compartment again. just a thimble full. but water none the less.

OK fine. Im taking the sub home for a few days. Trim and water sealing.

Thing is I spend a bit of time yesterday (while batteries were trickle charging for my controller) and redid all the old sylicone around all the aft fittings. Because I kept getting a drop or two of water in the aft WTC. Well fine. Ill take it home and pay attention to it. I will find that leak. Oh yes I will. Right now I suspect the main shaft. I put some oil in it one day and I think I diluted the grease. So Ive probably got to pull the motor and the shaft and re-grease the whole thing.

ahh what a fun activity Ive gotten myself into ! LoL.
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Old May 10, 2014, 11:37 PM
Ah, so its THIS again. . .
Ronin055's Avatar
United States, NV, Sparks
Joined Jan 2013
327 Posts
Found the leak. A very small leak around the main shaft exiting the WTC.

I think its packed with grease. Am I correct on that?

Now I have to figure out how to re-seal that component.
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Old May 11, 2014, 12:38 AM
Registered User
California Desert... 7 miles from nearest town
Joined Jan 2010
367 Posts
The main propeller shaft seals are usually o-ring or cup seals.
There would be a groove inside the shaft housing that holds the o-ring or cup seal.

Here's two versions of propeller shaft seals.


All they need is a slight touch of silicone grease every so often.

The rubber can dry out and crack. Very small cracks. You would need to actually pull on the seals to get the cracks to open up.
-------------------
If you remove the propeller shaft, you should be able to s see the 0-ring or cup seal and pull it out with some sort of small flat hook.

A new 0-ring or cup seal will be flexible enough to bend and insert back in to the shaft housing. Make sure to clean the groove inside the house before inserting new seal.
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Old May 11, 2014, 12:47 AM
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California Desert... 7 miles from nearest town
Joined Jan 2010
367 Posts
I just went back through your photos.


You have some very old style seal housings. If you remove the Allen screws, you might just be able to pull the housing a part and get to the seals. You'll need to look closer at the shaft seal.

This reminds me of days when we took brass compression fitting and made them squeeze the o-rings just enough to make a good seal on the rotating shafts without slowing the motors down. We even made the control rods rotate instead of push in and out so the seals would do their job.

I still have some of those in my parts bin from a scraped test platform.
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Old May 11, 2014, 03:47 AM
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Philippines
Joined Jan 2005
826 Posts
Wonder why the subtech seal holders were installed backwards and what those allen screw are for.

I assume the simmering or cup seals inside have been reversed to seal properly.
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Old May 11, 2014, 10:28 AM
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California Desert... 7 miles from nearest town
Joined Jan 2010
367 Posts
If the shaft seal is leaking...maybe it was not turned around.

Though the pressures we experience should not cause leaks even if backwards.

I would think the seal (s) may have dried out over time.

For a few dimes you can replace them all and reinstall with a little silicone grease or Vaseline. I have a small glass jar with Vaseline in it. I have kept o-rings in it for years and they stay nice and soft. Some are over 30 years old in that jar and I wouldn't hesitate to use them.
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Old May 11, 2014, 11:36 AM
Ah, so its THIS again. . .
Ronin055's Avatar
United States, NV, Sparks
Joined Jan 2013
327 Posts
I guess Ill have to pull the whole motor out shaft and all and see whats going on in there.
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Old May 11, 2014, 11:55 AM
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California Desert... 7 miles from nearest town
Joined Jan 2010
367 Posts
If the boat is already sinking then pulling the equipment out is the next step.
Certainly couldn't hurt to see if you can get the existing seals out and replace them.
-------------
I'm currently building a Skipjack.
I have been modifying the edges where the upper and lower hull halves join.
Friday, I realized I was making modifications the upper hull that belong on the lower hull.
So I have been removing all the glued in plastic sheeting strips to start over.
Certainly learning how to use a Dremel.
Should finish the removal part today.

Tomorrow, I get to make all the little plastic parts again.
I will make sure I am working on the correct hull half before I start gluing things in again.
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