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Old 19-03-2011, 03:37   #1
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Location: South East Asia
Boat: Hans Christian 48T
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Shaft Seal Cooling and Lubrication

Hi all

Just launched the boat and spent some days cruising. I found a problem and I wonder if I might find a solution from this learned community.

I changed both cutless bearings on the stern tube (long shaft). The forward one, nearer the engine, has a connection for water injection from the engine. Immediately forward of the bearing is the bellows of the PSS shaft seal. The shaft seal's static (carbon?) part also has a water connection, which in my boat was used for venting. During the first few hours of running I noticed that the shaft got quite hot to the touch. Water was not flowing forward. I opened the seal a few times to fill up the stern tube but it kept emptying after a while.

Not being able to think of anything else, I connected the water injection directly to the shaft seal and blanked the forward bearing's water inlet. This way the water can only get out from the aft end of the shaft.

The question is: is this correct? I have had no more heating and no leaking or strange screeching noises, but having limited knowledge I prefer asking.

All the best
Capn Morgan
'If you can fill the unforgiving minute with sixty seconds' worth of distance run...'
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Old 19-03-2011, 07:10   #2
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Re: Shaft seal cooling and lubrication

I'd go straight to the source:

Telephone: 425-355-3669
Toll Free: 800-523-7558
Fax: 425-355-3661
PYI Inc.
12532 Beverly Park Rd.
Lynnwood, WA 98087-1524
"I have never understood why it is "greed" to want to keep the money you have earned,
but not greed to want to take somebody else's money"

-Thomas Sowell
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cooling, shaft seal

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