[Alberg30] More Stuffiing Box Hose Replacement Questions

R.C. Alley ralley at chesapeake.net
Thu Apr 25 16:20:00 PDT 2002 

Tom: I  (of course) have no Idea what was done with your boat--but, here was
the situation with mine (#219) this past year.

1. The sealant was factory installed, about 30 years ago--known then as
thiakol.  (If gray in color)
2. There were no rear clamps that I remember. There may have been one.
3. I had to cut some of the sealant away to get the hose loose, using a
farrier's knife--I am told that it is now called a linoleum knife.
4. Mike's comment about the dissimilar diameters of stern tube/stuffing box
is correct. And it is important that you get the proper fit on the stern
tube, with enough purchase for two clamps, side by side.
5. Note that the stern tube is a non-standard size O.D., and hose may be a
special order, depending on how well stocked your supplier is.  There are
some ersatz answers if the proper hose diameters for the tube OD are not
available.
6. You can take the stern tube out to fit parts to it, but it MUST be
rebedded--and you run the risk of incompatibility between the sealant that
is already there and the new sealant you use.
7.  Make sure that you use the best quality all stainless clamps you can
buy.  Doing this work is a pain in the gleutimus maximus--shortcuts and
cheap materials will give you more practice at this than you are likely to
want.

Rob Alley
----- Original Message -----
From: "Forhan, Thomas" <Thomas.Forhan at mail.house.gov>
To: <public-list at alberg30.org>
Sent: Tuesday, April 23, 2002 6:44 PM
Subject: RE: [Alberg30] More Stuffiing Box Hose Replacement Questions


> Thanks for the details Mike. On this one, clearly the aft end of the hose
is
> covered with caulk -its pretty flexible, and I can not see hose clamps, or
> find any easily probling with a small screwdriver- but they could be
there.
>
>
> We could continue to dig around and try to find those hose clamps, but
with
> sealant holding in the tube itself that sounds dangerous.
> The buyer is very uncomfortable about the condition of the hose, and it
> sounds to me- I'm positing theory here and I would appreciate more
thoughts-
> that we chould go ahead, pull the shaft (ugh) and then cut the hose out,
> working carefully aft toward the area of the stern tube as we remove
> sealant.
>
> Whadda ya think?
>
> Tom
>
>
>
> -----Original Message-----
> From: Mike Lehman [mailto:sail_505 at hotmail.com]
> Sent: Tuesday, April 23, 2002 4:00 PM
> To: public-list at alberg30.org
> Subject: Re: [Alberg30] More Stuffiing Box Hose Replacement Questions
>
>
> Tom,
>
> There is a pipe (stern tube) that goes thru the hull. On the outside the
> cutlass bearing housing screws onto the end of the pipe. On the inside the
> rubber hose covers the inboard end of the pipe and is secured by two hose
> clamps. On the other end of the hose, the stuffing box is secured by two
> hose clamps. The stuffing box makes the seal around the shaft, which runs
> thru this pipe, and keeps the water out of the boat. When the boat is in
the
>
> water, there is always water in this rubber hose. If this hose fails the
> boat would sink, and it would be very difficult to stop the incomming
water.
>
> The sealant you see around the pipe on the inside at the hull is polyester
> which is used to hold the pipe in place. There should not be any water
> entering the boat between the pipe and the hull. The sealant application
> wasn't very neat, but it didn't need to be...it needed to keep the water
out
>
> and the pipe in place. If it doesn't leak, don't mess with it. The hose,
on
> the other hand, needs to be inspected periodically for wear or dry rot for
> reasons explained earlier. The difficulty with the A30 is that the pipe
and
> the stuffing box are different diameters. As I recall, the pipe is 1-3/8"
OD
>
> and the stuffing box is 1-1/2" OD, meaning that a replacement hose either
> has to be a d--- tight fit on the stuffing box, or the hose camps have to
be
>
> over tightened on the pipe end to prevent a leak.
>
> Hope this helps
>
> ----Original Message Follows----
> From: George Dinwiddie <gdinwiddie at min.net>
> Reply-To: public-list at alberg30.org
> To: public-list at alberg30.org
> Subject: Re: [Alberg30] More Stuffiing Box Hose Replacement Questions
> Date: Tue, 23 Apr 2002 15:21:44 -0400 (EDT)
>
> Tom,
>
> The hose should be attached with *two* hose clamps at *each* end, for
> a total of four.  This should be the case for all bits of rubber hose
> below the waterline.
>
> It's normal that the shaft log be embedded in gobs of caulk, but the
> rubber hose should not be.  Do you have a copy of the Maintenance
> Manual?  In the "prop" chapter there's a pretty good cutaway drawing
> of the shaft log and stuffing box (though it only shows one hose
> clamp at each end of the hose).
>
>   - George
>
>  > Forhan, Thomas said:
>  >
>  > Does anyone else have the sealant at the prop end of the stuffing box,
or
>  > can describe what we should be seeing?
>  >
>  > We -old and new owner working togther- opened up the inspection plate
and
>  > got a much better look at it this morning. Perhaps as expected in what
is
>  > likely the original Atomic 4 installation, we found the stuffing box
nuts
>
> to
>  > be 1 7/8" and 2". The rubber hose, though not pretty, appears to be
>  > resilent- you can put your hand around it, squeeze, and feel some give,
> so I
>  > do not  think it is dryrotted out.   The hull end is totally bedded in
>  > sealant, so much so that I don't understand what is inside, i.e. how
does
>  > the hose terminates at the hull/cutlass bearing end.  Is the rubber
hose
>  > also supposed to be hose clamped to some sort of sleeve that comes out
of
>  > the hull? The sealant is so thick that there could be room for a hose
> clamp
>  > in there, but I don't want to pry away at something that I don't
> understand.
>  >
>  >
>  > We are going to repack the stuffing box, and the cutlass bearing
appears
>  > fine according to the surveyor, with just a bit of play, so it is not
> like
>  > we need to completely replace everything.
>  >
>  > The new buyer is concerned about what would be the right thing to see
> back
>  > there, and I - nor his surveyor, I guess- don't know.
>  >
>  > I am also concerned about "destructive examination" causing more a
> problem
>  > than we have now. (Boat has been out of the water for more than two
> years,
>  > but I do not think there was any real problem in the area at that
time.)
>  >
>  > Any and all advice gratefully received.
>  >
>  > Thanks
>  >
>  > Tom F.
>
> --
>   ----------------------------------------------------------------------
>    George Dinwiddie                             gdinwiddie at alberg30.org
>    The gods do not deduct from man's allotted span those hours spent in
>    sailing.                                    http://www.Alberg30.org/
>   ----------------------------------------------------------------------
>
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