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Old 26-03-2008, 15:01   #1
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Constant submersion lower unit?

Hi guys,

I'm curious about the seals in lower units like saildrives, and thrusters. On one side theres the ocean, on the other is gear oil.

I'm thinking about building a 90 degree gear box for constant immersion in salt water but haven't torn down any pre-existing units to see what they use for a shaft seal. Are they just lip seals, or do they have some fancy stuff going on inside?

Thanks guys.

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Old 26-03-2008, 16:20   #2
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They are just a lip seal.
You are going to build a 90deg box?? Why???
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Old 26-03-2008, 16:41   #3
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Thanks Alan!

I'm building a hydraulic bow and stern thruster for a 1942 83 foot coast guard cutter turned motor yacht.
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Old 28-03-2008, 21:12   #4
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You would be better off buying a unit.

If the vessel is twin screw, what is the advantage?

Wood Hull?

What was the USCG # ?
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Old 30-03-2008, 11:37   #5
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Chief,

CG 83334 When she went to Normandy she was USCG 6. Looks a little bit different now... nevertheless I'm lobbying to paint the skull and cross bones once more.


She has a wood hull, built by Wheeler. She's powered by two cummins diesels, 855ci putting out 194 hp each. Originally she weighed 83 tons, but after the cabin was added, and the hull glassed she's closer to a hundred.

The reason for the bow and stern thruster, is that with 15 knots of wind the bow blows over. Around a thousand square feet of windage, with the port engine in reverse and the starboard in forward she won't hold hold the bow steady. The hope is that two 700lb thrusters will make docking in less than perfect conditions less stressful.
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