3/16 instead of 1/2 " Stuffing ? - SailNet Community

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Old 04-26-2013
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3/16 instead of 1/2 " Stuffing ?

Hey guys, I know it's unusual, maybe not, I could not pound in the 1/4 inch waxed rope into the nut, ( this one goes into the nut, not the sleeve. So I am considering using 5-6 wraps of 3/16. What say you ?
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Old 04-26-2013
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Re: 3/16 instead of 1/2 " Stuffing ?

There should be a specified size for a specific stuffing box and shaft. If 1/4" won't fit, obviously you'll need to go down. However, I wouldn't rely on lots of rings of smaller size to replace fewer rings of the proper size.
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Old 04-26-2013
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Re: 3/16 instead of 1/2 " Stuffing ?

Quote:
Originally Posted by GaiaOrion View Post
Hey guys, I know it's unusual, maybe not, I could not pound in the 1/4 inch waxed rope into the nut, ( this one goes into the nut, not the sleeve. So I am considering using 5-6 wraps of 3/16. What say you ?
In a traditional stuffing box design, one does not "pound" anything into anything. Packing, either waxed or greased flax or Teflon impregnated glass fiber is usually square in shape and is wrapped around the shaft with the overlaps cut a a 45º angle to make a single continuous ring around the shaft. There are usually 3 rings with the 45º cuts spaced 120º apart. The packing nut passes over these and is tightened down, compressing the packing rings against the shaft on one side and the inside face of the packing nut on the other. Once adjusted for a drip rate of approximately one drip every 20 seconds or so for traditional greased/waxed packing, or minute or so, or less, for Teflon impregnated packing, the Locking nut is tightened against the packing nut to hold the packing nut in place. Waxed twine "ain't" gonna do the job.

It would be wise to do a little goggling of Shaft Packing Glands to get an idea of what you are doing before experimenting with such an important piece of equipment, no?
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Last edited by svHyLyte; 04-26-2013 at 01:30 PM. Reason: Addendum
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Old 04-26-2013
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Re: 3/16 instead of 1/2 " Stuffing ?

If you have to pound or otherwise force, cram or jam the packing into your packing gland then the size of packing material you are using is too big.
You should be using the largest size of packing that easily fits into the space in the packing gland. The tension from the packing nuts will make the packing material fill up the rest of the space.
Using an over sized packing material is a bad idea all around. You can score your prop shaft if the fit is too tight and it would be unlikely that you could achieve the proper drip rate using oversized packing material. Been there, done that; had to replace the 1/4" packing for 3/16" with my 1" shaft to achieve the right drip rate.
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