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Re: Stuffing Box

 

Jeremy, Caleb, Patrick,
Caleb, the stuffing should press into the cavity around the shaft with little to no pressure. The ends of the cavity and nut should be tapered.? As the nut is drawn up the packing compresses and pushes against the outside of the cavity and the shaft as well.? This is what causes the seal.? If you ram in the packing it is already compressed and can not be loosened effectively, thus causing problems of heat and too much friction.? You can also purchase rope packing and wind it loosely around the shaft inside the cavity until it is full, carefully pushing it into the cavity as you go. Run the nut in and then back off the nut so you can place more into the cavity.? Fill it until you can get the nut on perhaps two threads.? Then you are good to go.? Tightening the gland nut puts tremendous pressure on the packing creating the seal.

Jeremy, when you purchase a new box off the shelf it very well may be different than what was it you boat originally, even for the same shaft size.? The T-27 as well as the Alberg 30 were standard production boats and they vary from one to another depending what was on hand at the time of their build.? Builders bought stuffing boxes in quantity.? When that supply ran out they bought whatever was at the best price at that time.?

Patrick, the clamps pictured in the link for the stuffing box Jeremy bought are exactly the type of clamps you should be using on the hose. They make a set of packing removal tools.? They have a flexible shaft with a cork screw type working end and a "T" handle to turn them into the packing.

Best to you all,
Michael
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On 11/12/2020 9:30 PM jeremy@... wrote:


Caleb,

3/16" packing is what you want to go with your 1" shaft and stuffing box.? 1/4" is too tight (don't ask me how I know this).

Alas. I am going to ask. I have repacked my stuffing box twice -- once in the water, and again when I replaced the entire stuffing box with a brand new one. According to the manufacturers website, the new stuffing box I am using does require 1/4" stuffing. However, I feel like packing the new glad was much harder than when I did it the first time. However, I have no records as to what size I used for the first time. (But, then I got smart and started keeping records, which is how I know I used 1/4" the second time).

Since the second time was with a new shaft and a new stuffing box, I wondered if the difference was that I used a different size packing material, or if it was just that everything was new.

I have not relaunched since I repacked, so I can not report on how it works in practice.

Here is my data saying that 1/4" is the 'official recommendation':


I can see you have been recommending the 3/16" over the 1/4" for at least 8 years,



I guess I am wondering if your recommendation has always been contrary to what the manufacturer recommends, or do I actually have a slightly different setup?

Given that I just paid for a new prop shaft, I am inclined to re-repack with the 3/16" and only re-re-repack with 1/4" if it seems to be dripping too much.

- jeremy



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