ben2go
Guru
In the engine room of the boat I am building, there are no real bilge(s). The lower hull is the engine room floor. The recommended shaft seal is a Halyard style shaft seal which is an oil filled seal. They can be seen about half way down this page with pics and full description on how they work. Stern glands – Cox Engineering
There is no where for the water to go for a standard stern gland shaft seal. The way the rear of the hull is shaped, it's very difficult to access the shaft without pulling the engine and gear box which is cramped against a forward bulkhead. I've looked at various drippless shaft seals but they need 10+ inches between the shaft coupler and the stern tube. I will have at best 6 inches going by the calculations I have done. The other problem is cooling water for the drippless seals. There will be no water coming aboard the boat from outside the hull. The boat will be keel cooled with dry exhaust.
Anyone have any ideas for other shaft sealing arrangements? I looked at the UK barge and narrow boat shaft seals. They use a grease seal with a pressurized grease cup mounted above the seal. It's like a standard type packing gland but filled with silicone grease. These are short and would fit but they are mainly for smaller slow spinning shafts usually around 1 inch or smaller. I'm not sure about rpm limits but my engine is a low rpm engine. My shaft will be 2 inches as spec'd.
There is no where for the water to go for a standard stern gland shaft seal. The way the rear of the hull is shaped, it's very difficult to access the shaft without pulling the engine and gear box which is cramped against a forward bulkhead. I've looked at various drippless shaft seals but they need 10+ inches between the shaft coupler and the stern tube. I will have at best 6 inches going by the calculations I have done. The other problem is cooling water for the drippless seals. There will be no water coming aboard the boat from outside the hull. The boat will be keel cooled with dry exhaust.
Anyone have any ideas for other shaft sealing arrangements? I looked at the UK barge and narrow boat shaft seals. They use a grease seal with a pressurized grease cup mounted above the seal. It's like a standard type packing gland but filled with silicone grease. These are short and would fit but they are mainly for smaller slow spinning shafts usually around 1 inch or smaller. I'm not sure about rpm limits but my engine is a low rpm engine. My shaft will be 2 inches as spec'd.