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Old 11-08-2012
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Stuffing box & grease fittings

I have a question about the stuffing box on my boat. I have attached a picture to show the arrangement. The stuffing box has two grease fittings, one on the compression ring and one on the end of the male fitting. I have been able to find a couple examples of stuffing boxes with the fitting on the compression ring, but have not found any examples with the other grease fitting.

Has anyone else run across a setup like mine? Should grease be used in both fittings? Why is there a fitting on the male side? Could grease in the fitting on the male side interfere with water flowing through the stuffing box?

Any other information, thoughts or ideas will be appreciated.
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Old 11-08-2012
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Re: Stuffing box & grease fittings

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Originally Posted by Kenn43 View Post
I have a question about the stuffing box on my boat. I have attached a picture to show the arrangement. The stuffing box has two grease fittings, one on the compression ring and one on the end of the male fitting. I have been able to find a couple examples of stuffing boxes with the fitting on the compression ring, but have not found any examples with the other grease fitting.

Has anyone else run across a setup like mine? Should grease be used in both fittings? Why is there a fitting on the male side? Could grease in the fitting on the male side interfere with water flowing through the stuffing box?

Any other information, thoughts or ideas will be appreciated.
Looks like a DIY jury rig.. That box style did not come with zerks and they can and do create the potential for corrosion as they are not bronze. The aft zerk will prevent cooling water from getting to the box once the log is filled with grease.....
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Old 11-08-2012
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Re: Stuffing box & grease fittings

That's the damndest thing that I've seen in a long time...

I believe that it is time for a new stuffing box. Too bad, because it looks like a relatively new one.
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Re: Stuffing box & grease fittings

It looks new to me too. I just don't understand why anyone would install the grease fittings. Is it a good idea or a bad idea? I don't know.
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Re: Stuffing box & grease fittings

Drinking and boating doesn't mix.

Gene
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Re: Stuffing box & grease fittings

Mine has a grease fitting as well and it seems to replace the water for lubrication and cooling. There is a grease gun mounted on the bulkhead over the engine with a hose to the stuffing box. I give the screw cap a turn every 20 hours or so. I was also skeptical about the grease fitting until I saw it used extensively in fishing boats here. I can say that after a long run on the engine the stuffing box is still cool to touch. The other benefit is that I don't have a drip at the gland.
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Re: Stuffing box & grease fittings

Copa,

Does your stuffing box have two fittings like mine? If not, which one do you have?
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Re: Stuffing box & grease fittings

No, just one fitting (one grease entry point). I'll take a picture of it this weekend when I go to the boat.
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Re: Stuffing box & grease fittings

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Drinking and boating doesn't mix.

Gene
I hear you on the drinking and boating, but I am still holding out hope that someone will show up with some helpful information.
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Old 11-09-2012
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Re: Stuffing box & grease fittings

I am contemplating making a dripless seal for my propshaft. Yes I know you can buy them but they're expensive and besides it's not only about saving money, it's about the sense of satisfaction.

A Marelon tube with three double-lipped oil seals as used in vehicle wheel bearings but the type that is fully rubber encased to prevent the shell from rusting. Between each seal a collar with a groove running around to distribute grease to the bleed-through hole.

The first two seals face the incoming water, the third at the other end of the tube faces the other way to contain the grease.



Then a zerk (? - I call them grease nipples) between the seals that allow the whole assembly to be pumped full of waterproof grease. From outside it would look like this:



It will take up less space on the shaft than the stuffing box I have now which I actually consider to be pre-historic and I reckon it will work really well.

Any reason why this would not work? The total cost excluding my labor (which when invoiced to me is really inexpensive ) would be about $40.
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