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Old 05-14-2022, 11:50 AM   #1
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Shaft seal question

Can someone explain the function of the water hose on this type of shaft seal? I understand the “packing” type of seal and its adjustment but don’t understand the reason for the water inlet in the shaft tunnel. The black hose connects to a dedicated through hull.
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Old 05-14-2022, 11:55 AM   #2
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Usually the hose is from the engine cooling water and provides lubrication to the packing material.
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Old 05-14-2022, 12:28 PM   #3
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Would that mean that this type of packing material should not drip?
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Old 05-14-2022, 01:07 PM   #4
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Not necessarily. It depends on the type of packing used. We used Duramax packing in our last boat that had traditional stuffing boxes. It didn’t drip after it was adjusted properly. But with other packing materials it would drip. That boat also had a hose from the engine cooling water to lubricate and cool the stuffing box.
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Old 05-14-2022, 04:10 PM   #5
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Or there might be another cutlass bearing at the top end of the shaft log needing water.
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Old 05-14-2022, 04:58 PM   #6
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It’s not unusual to have a water feed drip box. The shaft angle may prevent water from reaching the stuffing while underway or they were concerned with overheating cutlass
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Old 05-17-2022, 06:33 PM   #7
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That kind of gland should drip a bit underway. Might not drip while stopped depending on waterline relative to the gland.
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Old 05-17-2022, 08:35 PM   #8
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Quote:
Originally Posted by DJK View Post
Can someone explain the function of the water hose on this type of shaft seal? I understand the “packing” type of seal and its adjustment but don’t understand the reason for the water inlet in the shaft tunnel. The black hose connects to a dedicated through hull.
In my setup a similar hose connects to a through-hull to expel shaft-lubricating seawater.

This water is picked up near the prop via a small scoop inlet on either side of the shaft so the forward motion pushes the water up the shaft.

Mine is a very old boat, but your hose may do the same.
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Old 05-17-2022, 09:17 PM   #9
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That kind of gland should drip a bit underway. Might not drip while stopped depending on waterline relative to the gland.
Not necessarily. It depends on what type of packing is in the shaft log. On our last boat we had Duramax packing. It can be adjusted so that it doesn’t drip either sitting or underway.
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Old 05-17-2022, 11:47 PM   #10
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With a dry exhaust boat a scoop and hose is one way to get water to the stuffing box area. Not sure how you ensure flow or know if it stops.
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