Volvo shaft seal - exceeding the stern tube max?

MoodySabre

MoodySabre

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I asked this question a few years ago but the old threads have disappeared.

I want to replace my Tides Seal with a Volvo shaft seal. The shaft is 1" so the maximum stern tube size given by Volvo is 1.75" (+0.5mm). My stern tube is 2". Can I push my luck on this? Will it actually get on there?
 
Do Radice make an RMTA in the correct sizes?.... IMHO, with the addition of a self bleed, and even better option than the Volvo. I seem to remember, without looking, that they had a wider variety of options.

EDIT - It appears not.... largest stern tube size for a 1" shaft is 42mm.... looks like you're stuck with a different shaft seal, or some stern tube modification!
 
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What is the inside diameter of the stern tube? You might be able to fit a piece of tube suitable for the RMTA or Volvo seal inside the existing tube after cutting it a bit shorter.
 
pvb said:
The Radice seal is only made for metric shafts, I believe.
Click to expand...

No they do imperial sizes but the parameters are even smaller http://www.sillette.co.uk/price_pdf_files/tides_marine_shaft_seals.pdf They look excellent. It is possible to get a reducer but it takes up room and is another component in an area where simplicity seems best.

I'm going to fit a new prop shaft . I was trying to get away from my current Tides Marine Seal which works well (or would do if the prop shaft wasn't so worn) but is reliant on a water feed (loss of water feed = damaged stern gland) which is not ideal.

Decisions, decisions. I'm changing all this whist the boat is out for Coppercoat so need to get everything ready in advance.
 
MoodySabre said:
No they do imperial sizes but the parameters are even smaller http://www.sillette.co.uk/price_pdf_files/tides_marine_shaft_seals.pdf They look excellent. It is possible to get a reducer but it takes up room and is another component in an area where simplicity seems best.

I'm going to fit a new prop shaft . I was trying to get away from my current Tides Marine Seal which works well (or would do if the prop shaft wasn't so worn) but is reliant on a water feed (loss of water feed = damaged stern gland) which is not ideal.

Decisions, decisions. I'm changing all this whist the boat is out for Coppercoat so need to get everything ready in advance.
Click to expand...

Any seal will fail if its lips have to bear on a rough or worn shaft. Is there an unworn section that the new seal can bear on? If there is such a section ahead of the existing seal then you should be able to extend the existing tube with a smaller diameter piece fitted inside it to take an RMTA seal.
 
Norman_E said:
Any seal will fail if its lips have to bear on a rough or worn shaft. Is there an unworn section that the new seal can bear on? If there is such a section ahead of the existing seal then you should be able to extend the existing tube with a smaller diameter piece fitted inside it to take an RMTA seal.
Click to expand...

How would a smaller tube be secured to the inside of the existing stern tube?
 
MoodySabre said:
How would a smaller tube be secured to the inside of the existing stern tube?
Click to expand...

It depends on the materials and how good a fit the tubes are. If your existing tube is brass or bronze and the new one the same, and a reasonable fit I would use Araldite, and suggest that you push the new tube about six inches into the old one. You could add a bit of belt and braces to the fit with a hole drilled through both, tapped and a small machine screw inserted. I guess you have the opportunity to pull the shaft out and clean the inside of the old tube, which is essential for a good result.
 
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