This subject is mentioned in replies to other questions but have been unable to find a thread that directly asks the question, and have read every discussion in prop seals
Background: have a Beneteau
with a Volvo
Seal. The stern tube is seperatley irrigated, other than the water
that come past the cutless bearing and up the tube. There is a valved through hull
with a hose connecting to a gland immediately aft of the Volvo
Seal. My drama is the brass hose tail in the gland was brittle as all @#$% and broke off. It appears to have been epoxied in as there is a slight rise on top of stern tube where it is screwed directly into the fibreglass tube.
A pic of my temporary repair.
Have been told that it might be possible to do away with the through hull
, hose and gland altogether, provided the seal is "burped" after haul outs, and it seems probably after extreme use of the prop with little forward motion of the boat; prop sucking water
out of tube???
The other proviso is that as long as the rotation of the shaft doesn't pump water out. Max speed under power would by 7kn. Haven't checked rotation direction of the 2040D Volvo, yet. Also I suppose it might be possible so much water forced up the tube in reverse it puts undue pressure on the seal but unlikely.
I think it has been mentioned in other threads that the gland could be used to vent the seal. But as it is below the seal, this would be ineffective I think.
So, bottom line is, has anyone run a Volvo Seal for an extended period without this type of cooling/lubrication via a separate seacock and hose to stern tube gland,with seal functioning as intended without damage?.
As an aside, my other issue is the hose tail debris that is almost certainly in the stern tube that might find its way to the seal, rip it and ... more drama.
Thanks in advance and especially to Pete7 who has already enlightened me somewhat.