Greetings and welcome aboard the CF, savage1.
“ The Volvo
seal is entirely constructed from rubber, combining the hose that attaches to the stern tube with lip seals
that prevent leakage of water
into the boat. An internal bearing is water
lubricated while the lip seals
need to be greased occasionally from a small sachet available from the manufacturer. The lips run directly on the shaft, which needs to be smooth and damage free. Volvo seals are reliable and long-lasting, a life of 10 years being common.
The seal is not vented in any way. On immersing the seal, whether at first launch or after drying on a tide, air will accumulate in the bearing. Running the shaft in this condition will cause a squealing noise and rapid wear. It is necessary to 'burp' the seal, compressing it in the lips area by hand to allow air to be dispelled.
A small amount of water should be allowed into the boat to ensure that no air remains..."
See the “Volvo Seal” ➥ http://coxengineering.sharepoint.com...ernglands.aspx