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Author Topic: Drain Tube Replacment  (Read 2068 times)

July 13, 2014, 05:41:45 PM
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dburr

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Drain Tube Replacment
« on: July 13, 2014, 05:41:45 PM »
This spring started out late because life got in the way and the weather was really uncooperative.. When I finally went to uncover the Osprey the last weekend in June, I found that the plastic drain tube inserts that I had installed 2 seasons ago had been started out.  I can only guess that water from  tarp leaks or condensation collected and froze had worked its way under the inboard lip and worked the tube out of the transom about 1/8 of an inch.

So, enough was enough, this time brass was going in.  It worked well for 23+ years, no reason for it not to work well again.  I went on ebay and ponied up the $30 for the flaring tool, $13 for the tubes and we were off to the races.
The old plastic insert came out in pieces.  I am no longer confident in them and if any of the Brethren are on the fence about using them, my vote is (and I know I don’t have one) is no.



I used 3M 4200 when I put them in knowing there was a strong chance that I would have to take them out.  Hind sight bein g what it is, that was a wise choice.  If you look closely in the picture you can see the 4200 skin is still intact and the wood core is still dry (enough).



The new tube (ordered a 3 ½”) slid in, and I used Bob’s buddies’ pencil trick to mark it, (see Bob, your fault again).  I held the pencil in one spot and spun the tube to get a line.



 The hardest part was cutting it to length.  The tubing cutter wanted to crush the tube no matter how careful I was. Lesson learned on the first tube.  The cutter crushed the tube to the point that I had to put a piece of 1” black iron pipe in and roll it on the steel top of the table saw to get it to the point where I could get the die in it.  That is why you see the second one with a dowel and a piece of tin flashing in it.  Before flaring I dressed the inside edge with a chainsaw file to get it de burred.  






A note on the flaring tool.. The dies came really nicely machined and they both had square cut shoulders that go into the tube in a really nice tight fit.  You booger the tube and you are SOL the fit is that good... The problem was easily solved by putting a spare bolt through one of the dies and putting the rig in a drill press and hitting it with a file for a 1/8” 45 degree chamfer.

So, the transom glass around the hole was chamfered a bit,  my thinking was that would allow for more 4200 to act as a seal then the hole is slathered with enough 4200 to get EVERYWHERE and in goes the tube and flaring tool.  I chose 4200 because if the transom needs to be done, that in itself will be enough of a chore, the last thing I want is to fight a tube out bedded in 5200..



The flare itself could not have been easier.  I covered the flaring tool lightly with oil to ease the flare and with the hope that I would not glue the @#$! thing to the boat.  So in the transom the whole works goes and I commenced to swinging on the wrench.  The bolt in the tool has a fine thread and it all goes relatively easily for what you are doing.  When the flare is done, you know it. The torque on the wrench changes noticeably and you are not going to turn it anymore unless you really grunt.
Then it is all done but for the cleanup.  I put the original flappers back on, they do not stop water from coming in but then again, I don’t care about that.





As for having a tool laying around that I might not need again?  Well, my buddies up here know I have it, if I didn’t have it, the yard bill would have been $300 to replace the tubes  and the evil spirits would somehow make it necessary for the tubes to be changed again..
Dave

88 222 Osprey
00 Yamaha OX66 150
CAS # 2590

July 13, 2014, 06:19:17 PM
Reply #1

RickK

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Re: Drain Tube Replacment
« Reply #1 on: July 13, 2014, 06:19:17 PM »
Very nice Dave  :salut:
The pipe cutter looks newish - do you think a new cutting wheel would have made it not crush?
Did you plan on doing both while you're at it or do you only have one?

Thanks for documenting that for the future. :thumleft:
Rick
1971 "170" with 115 Johnson (It's usable but not 100% finished)

1992 230 Explorer with 250 Yamaha

July 13, 2014, 06:28:24 PM
Reply #2

dburr

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Re: Drain Tube Replacment
« Reply #2 on: July 13, 2014, 06:28:24 PM »
The cutter wheel is new Rick which is why I got a surprise when I went to cut it.  There was no crush on 1.5" copper pipe, it just cut.. I was not impressed with the wall thickness of the tube, a little thin I think but it is what Great Lakes sent me.  I ended up doing both because I wanted to get rid of the plastic and I am glad I did, the flappers work way better on the brass too..
Dave

88 222 Osprey
00 Yamaha OX66 150
CAS # 2590

July 15, 2014, 10:27:24 PM
Reply #3

kaptainkoz

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Re: Drain Tube Replacment
« Reply #3 on: July 15, 2014, 10:27:24 PM »
There should have been a metal fold out piece of flat tapered-cut metal on that pipe cutter which is designed to go inside the cut tube and with a spin of the tube is supposed to reverse that taper in from the pressure of the cut.
Great post. Very informative step by step. Nice work looks great.
1979 246 CCP project boat forever in development, Chesapeake Bay Virginia
Steven Koz<a href=\"mailto:Captainkoz@aol.com\"
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July 15, 2014, 10:59:45 PM
Reply #4

gran398

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Re: Drain Tube Replacment
« Reply #4 on: July 15, 2014, 10:59:45 PM »
Sorry to have missed this post Sunday, went out  fishing.

Excellent install/replacement on something we all overlook....the transom drain tube.

On vintage boats....and others not so vintage....99% of transom rot occurs due to a loose/leaching drain tube.

The adhesive lets loose from the original tube install. The boat is in the water, and the garboard drain is 18 inches or more below the surface. Plenty of pressure for water to seek its own level. Which in this case is upward.

Water seeps into the plywood from around/outside of the tube. Then flows upward through the plywood core, and the transom becomes saturated. The core then rots from the bottom up and turns to wet mush.  Many pics here to confirm this slow process.

Great job, important post. Thanks Dave!  :salut:

July 16, 2014, 12:25:11 AM
Reply #5

dburr

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Re: Drain Tube Replacment
« Reply #5 on: July 16, 2014, 12:25:11 AM »
Quote from: "kaptainkoz"
There should have been a metal fold out piece of flat tapered-cut metal on that pipe cutter which is designed to go inside the cut tube and with a spin of the tube is supposed to reverse that taper in from the pressure of the cut.
Great post. Very informative step by step. Nice work looks great.

Many thanks for the good word Boys!

There is a little gizmo on my smaller cutter Steve that does that and also deburrs the cut tube. On the big one however, at least the one I have, (a kobalt IRRC)  the arch on the throat isn't big enough.  The cutter works on 5/8" to 3" :shock:, that'd be a big fold out..

I wish it had one of those things it would have been a bunch easier then messing with the dowel. A tapered hardwood cone would have been ok to.  

How was the ride Scotty?
Dave

88 222 Osprey
00 Yamaha OX66 150
CAS # 2590

July 16, 2014, 08:42:20 AM
Reply #6

gran398

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Re: Drain Tube Replacment
« Reply #6 on: July 16, 2014, 08:42:20 AM »
I have been absolutely spoiled to the core my friend. It was a 39 Contender Super Sport, trip 350's, 2014 model, 2nd trip :mrgreen:

Will post the pics here ASAP. Already have a title to for thread....a song called

"Marching to Mars" :flower:

July 16, 2014, 09:37:49 AM
Reply #7

wingtime

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Re: Drain Tube Replacment
« Reply #7 on: July 16, 2014, 09:37:49 AM »
One tip I like to follow is to seal the edges of the wood core with epoxy. This gives you an extra layer of protection against water intrusion in case the 5200 fails.
1998 Explorer w/ Etec 250


1987 170 w/ Evinrude 90

 


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