Next message: Richard: "T&T: painting"
On my 40' OA with 1 3/4" shaft the packing size is 5/8, way off from the
discussion below.
Richard
BTW, I still have not found a satisfactory way to extract the forward
cutlass bearing. The shaft tube is right up to the back of the bulkhead that
has the packing bearing and front end of the cutlass tube. No set screws to
hold a bearing in place showing or accessable. Thanks especially to Michael
Negley for the response, very very close to my situation except no set
screws so we have to believe the bearing relies only on a press fit.
Please o please is there another '79 38 or 40' OA DC out there....
> Mike, you're to be commended for attacking such an ambitious project, to
> find all the documentation available for the entire boat! I've tried,
> with
> our 15 year-old Taiwanese boat and it's tough in our situation. We did
> find
> quite a bit of documentation from the PO, but not everything is covered;
> such as the stuffing boxes. I had to finally deal with the issue as we
> were
> getting excessive dripping and could not turn down the packing any more.
>
> Not knowing which size to use, and not finding any identification on the
> hardware, I bought several different sizes and ended up using the largest
> that I could squeeze into the slot. Which on our 2" shafts was 5/16"
> packing material. I could almost squeeze in 3/8" packing, but couldn't
> actually do it. Today we have no excessive dripping, no problems at all
> with our conventional packing gland/stuffing boxes. Someone without the
> specific documentation on what size packing to use could easily be lulled
> into using a smaller size, since they are easier to install. They should
> NOT do that.
>
> Bob Peterson
> 47' Lien Hwa CMY
> "Lopaka Nane"
> San Francisco
>
> -----Original Message-----
> From:
> [mailto:] On Behalf Of
> Mike
> Maurice
> Sent: Monday, October 17, 2005 10:45 AM
> To:
> Subject: T&T: Attention to Details, Reading the Documentation.
>
> While doing some research on the Stern Tube Packing Box on a 43'
> sailboat I discovered what may be a problem with the packing material
> being
> used. The most likely id for the Box is that from the Buck Algonquin
> catalog
> 704, page 81. The shaft size is 1 3/8" and the book indicates that the
> correct packing is 5/16", whereas the packing material that I have a
> sample
> of that has been used in the past is 1./4".
> The smaller size packing materials are so close in size to each other that
> is pretty easy to make a mistake in selecting the proper size material
> from
> off the shelf at some marine store. Once the wrong size has been
> installed,
> it may be forever before anyone discovers the mistake.
> In the meantime, the packing is likely to never fit the way it is supposed
> to and in this particular case, the Box has been leaking more than it
> should
> and the packing shows signs of not fitting precisely.
>
> The point that am trying to make is that it is a heck of a lot easier to
> identify problems and mistakes from reading the documentation than
> noticing
> a problem and understanding the source of the problem from evidence in the
> field.
> I doubt that I would have EVER discovered this mistake or the cause of the
> problem except from reading the documentation.
>
> For this particular boat I have been tracking down documentation on every
> single component in the entire boat. The amount of material that is
> available on the web makes this practical even if it is a bit tedious. The
> beauty is that you can acquire the materials in digital form, usually PDF
> files and store them on disk or CD. The entire library of info for an
> entire
> boat can be stored on a single CD, in most cases.
>
> Regards,
> Mike
> Capt. Mike Maurice
> Tualatin(Portland), Oregon
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